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Annual Review of Astronomy and Astrophysics

Volume 58, 2020

Streams, Substructures, and the Early History of the Milky Way

Abstract

The advent of the second data release of the mission, in combination with data from large spectroscopic surveys, is revolutionizing our understanding of the Galaxy. Thanks to these transformational data sets and the knowledge accumulated thus far, a new, more mature picture of the evolution of the early Milky Way is currently emerging.

  • ▪   Two of the traditional Galactic components, namely, the stellar halo and the thick disk, appear to be intimately linked: Stars with halo-like kinematics originate in similar proportions from a heated (thick) disk and from debris from a system named Gaia-Enceladus. Gaia-Enceladus was the last big merger event experienced by the Milky Way and was completed around 10 Gyr ago. The puffed-up stars now present in the halo as a consequence of the merger have thus exposed the existence of a disk component at ∼ 1.8. This is likely related to the previously known metal-weak thick disk and may be traceable to metallicities [Fe/H] −4. As importantly, there is evidence that the merger with Gaia-Enceladus triggered star formation in the early Milky Way, plausibly leading to the appearance of the thick disk as we know it.
  • ▪   Other merger events have been characterized better, and new ones have been uncovered. These include, for example, the Helmi streams, Sequoia, and Thamnos, which add to the list of those discovered in wide-field photometric surveys, such as the Sagittarius streams. Current knowledge of their progenitors’ properties, star formation, and chemical evolutionary histories is still incomplete.
  • ▪   Debris from different objects shows different degrees of overlap in phase-space. This sometimes confusing situation can be improved by determining membership probabilities via quantitative statistical methods. A task for the next few years will be to use ongoing and planned spectroscopic surveys for chemical labeling and to disentangle events from one another using dimensions other than phase-space, metallicity, or [α/Fe].
  • ▪   These large surveys will also provide line-of-sight velocities missing for faint stars in releases and more accurate distance determinations for distant objects, which in combination with other surveys could also lead to more accurate age dating. The resulting samples of stars will cover a much wider volume of the Galaxy, allowing, for example, the linking of kinematic substructures found in the inner halo to spatial overdensities in the outer halo.
  • ▪   All the results obtained so far are in line with the expectations of current cosmological models. Nonetheless, tailored hydrodynamical simulations to reproduce in detail the properties of the merger debris, as well as constrained cosmological simulations of the Milky Way, are needed. Such simulations will undoubtedly unravel more connections between the different Galactic components and their substructures, and will aid in pushing our knowledge of the assembly of the Milky Way to the earliest times.

Keyword(s): Galaxy: evolution, Galaxy: formation, Galaxy: halo, Galaxy: kinematics and dynamics, Galaxy: thick disk
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Literature Cited

  1. Abadi MG, Navarro JF, Steinmetz M, Eke VR 2003. Ap. J 597:21–34
  2. Abbott TMC, Abdalla FB, Allam S et al. 2018. Ap. J. Suppl. 239:18
  3. Adibekyan VZ, Santos NC, Sousa SG, Israelian G 2011. Astron. Astrophys. 535:L11
  4. Alves-Brito A, Meléndez J, Asplund M, Ramírez I, Yong D 2010. Astron. Astrophys. 513:A35
  5. Amorisco NC. 2017. MNRAS 464:2882–95
  6. Antoja T, Helmi A, Romero-Gómez M et al. 2018. Nature 561:360–62
  7. Antoja T, Monari G, Helmi A et al. 2015. Ap. J. Lett. 800:L32
  8. Aoki W, Beers TC, Christlieb N et al. 2007. Ap. J 655:492–521
  9. Arenou F, Luri X, Babusiaux C et al. 2018. Astron. Astrophys. 616:A17
  10. Arlandini C, Käppeler F, Wisshak K et al. 1999. Ap. J 525:886–900
  11. Auvergne M, Bodin P, Boisnard L et al. 2009. Astron. Astrophys. 506:411–24
  12. Bahcall JN, Soneira RM. 1984. Ap. J. Suppl. 55:67–99
  13. Banerjee A, Jog CJ. 2011. Ap. J. Lett. 732:L8
  14. Barbá RH, Minniti D, Geisler D et al. 2019. Ap. J. Lett. 870:L24
  15. Barbuy B, Chiappini C, Gerhard O 2018. Annu. Rev. Astron. Astrophys. 56:223–76
  16. Barnes JE. 1992. Ap. J 393:484–507
  17. Battistini C, Bensby T. 2016. Astron. Astrophys. 586:A49
  18. Baugh CM, Cole S, Frenk CS, Lacey CG 1998. Ap. J 498:504–21
  19. Beers TC, Carollo D, Ivezić Ž et al. 2012. Ap. J 746:34
  20. Beers TC, Chiba M, Yoshii Y et al. 2000. Astron. J. 119:2866–81
  21. Beers TC, Drilling JS, Rossi S et al. 2002. Astron. J. 124:931–48
  22. Bekki K, Freeman KC. 2003. MNRAS 346:L11–15
  23. Belokurov V. 2013. New Astron. Rev. 57:100–21
  24. Belokurov V, Erkal D, Evans NW, Koposov SE, Deason AJ 2018. MNRAS 478:611–19
  25. Belokurov V, Evans NW, Bell EF et al. 2007. Ap. J. Lett. 657:L89–92
  26. Belokurov V, Sanders JL, Fattahi A et al. 2020. MNRAS 494:3880–98
  27. Belokurov V, Zucker DB, Evans NW et al. 2006. Ap. J. Lett. 642:L137–40
  28. Bensby T, Feltzing S, Lundström I 2003. Astron. Astrophys. 410:527–51
  29. Bensby T, Feltzing S, Oey MS 2014. Astron. Astrophys. 562:A71
  30. Bernard EJ, Ferguson AMN, Schlafly EF et al. 2016. MNRAS 463:1759–68
  31. Bica E, Bonatto C, Barbuy B, Ortolani S 2006. Astron. Astrophys. 450:105–15
  32. Bignone LA, Helmi A, Tissera PB 2019. Ap. J. Lett. 883:L5
  33. Binney J, Tremaine S. 2008. Galactic Dynamics Princeton, NJ: Princeton Univ. Press. , 2nd ed..
  34. Bird JC, Kazantzidis S, Weinberg DH et al. 2013. Ap. J 773:43
  35. Bisterzo S, Gallino R, Straniero O, Cristallo S, Käppeler F 2010. MNRAS 404:1529–44
  36. Bland-Hawthorn J. 1999. Nature 400:220–21
  37. Bland-Hawthorn J, Freeman K. 2000. Science 287:79
  38. Bland-Hawthorn J, Gerhard O. 2016. Annu. Rev. Astron. Astrophys. 54:529–96
  39. Bland-Hawthorn J, Sharma S, Tepper-Garcia T, Binney J, Freeman KC et al. 2019. MNRAS 486:1167–91
  40. Bonaca A, Conroy C, Wetzel A, Hopkins PF, Kereš D 2017. Ap. J 845:101
  41. Bonaca A, Hogg DW, Price-Whelan AM, Conroy C 2019. Ap. J 880:38
  42. Borsato NW, Martell SL, Simpson JD 2020. MNRAS 492:1370–84
  43. Bournaud F, Elmegreen BG, Elmegreen DM 2007. Ap. J 670:237–48
  44. Bournaud F, Elmegreen BG, Martig M 2009. Ap. J 707:L1–5
  45. Bovy J. 2015. Ap. J. Suppl. 216:29
  46. Bovy J, Erkal D, Sanders JL 2017. MNRAS 466:628–68
  47. Bovy J, Rix HW, Hogg DW 2012. Ap. J 751:131
  48. Bowden A, Evans NW, Williams AA 2016. MNRAS 460:329–37
  49. Brauer K, Ji AP, Frebel A et al. 2019. Ap. J 871:247
  50. Brinchmann J, Charlot S, White SDM et al. 2004. MNRAS 351:1151–79
  51. Brook CB, Kawata D, Gibson BK, Flynn C 2003. Ap. J. Lett. 585:L125–29
  52. Brook CB, Kawata D, Gibson BK, Freeman KC 2004. Ap. J 612:894–99
  53. Buckley MR, Hogg DW, Price-Whelan AM 2019. arXiv:1907.00987 [astro-ph.GA]
  54. Buist HJT, Helmi A. 2015. Astron. Astrophys. 584:A120
  55. Buist HJT, Helmi A. 2017. Astron. Astrophys. 601:A37
  56. Burton WB. 1988. Trans. Int. Astron. Union Ser. A 20A:377–421
  57. Busso M, Gallino R, Wasserburg GJ 1999. Annu. Rev. Astron. Astrophys. 37:239–309
  58. Cantat-Gaudin T, Jordi C, Vallenari A, Bragaglia A, Balaguer-Núñez, et al. 2018. Astron. Astrophys. 618:A93
  59. Carney BW, Laird JB, Latham DW, Aguilar LA 1996. Astron. J. 112:668
  60. Carollo D, Beers TC, Chiba M, Norris JE, Freeman KC et al. 2010. Ap. J 712:692–727
  61. Carollo D, Beers TC, Lee YS et al. 2007. Nature 450:1020–25
  62. Carollo D, Freeman K, Beers TC et al. 2014. Ap. J 788:180
  63. Carollo D, Tissera PB, Beers TC et al. 2018. Ap. J. Lett. 859:L7
  64. Carretta E, Bragaglia A, Gratton RG et al. 2009. Astron. Astrophys. 505:117–38
  65. Casey AR, Hawkins K, Hogg DW et al. 2017. Ap. J 840:59
  66. Chambers KC, Magnier EA, Metcalfe N et al. 2016. arXiv:1612.05560 [astro-ph.IM]
  67. Chaplin WJ, Basu S, Huber D et al. 2014. Ap. J. Suppl. 210:1
  68. Chaplin WJ, Miglio A. 2013. Annu. Rev. Astron. Astrophys. 51:353–92
  69. Cheng JY, Rockosi CM, Morrison HL et al. 2012. Ap. J 752:51
  70. Chiappini C, Matteucci F, Gratton R 1997. Ap. J 477:765–80
  71. Chiba M, Beers TC. 2000. Astron. J. 119:2843–65
  72. Chiba M, Yoshii Y. 1998. Astron. J. 115:168–92
  73. Christlieb N, Battistini C, Bonifacio P et al. 2019. Messenger 175:26–29
  74. Conroy C, Bonaca A, Cargile P et al. 2020. Ap. J 883:107
  75. Conti PS, Greenstein JL, Spinrad H, Wallerstein G, Vardya MS 1967. Ap. J 148:105–27
  76. Cooper AP, Cole S, Frenk CS et al. 2010. MNRAS 406:744–66
  77. Cowan JJ, Sneden C, Lawler JE et al. 2019. arXiv:1901.01410 [astro-ph.HE]
  78. Dalton G, Trager S, Abrams DC et al. 2016. Ground-based and Airborne Instrumentation for Astronomy VI, Vol. 9908 CJ Evans, L Simard, H Takami Bellingham, WA: SPIE
  79. Das P, Hawkins K, Jofre P 2020. MNRAS 493:5195–207
  80. de Boer TJL, Belokurov V, Koposov SE et al. 2018. MNRAS 477:1893–902
  81. de Jong JTA, Yanny B, Rix HW et al. 2010. Ap. J 714:663–74
  82. de Jong RS, Agertz O, Berbel AA et al. 2019. Messenger 175:3–11
  83. De Silva GM, Freeman KC, Bland-Hawthorn J et al. 2015. MNRAS 449:2604–17
  84. De Silva GM, Sneden C, Paulson DB et al. 2006. Astron. J. 131:455–60
  85. de Zeeuw T, Norris J 1999. Publ. Astron. Soc. Pac. 111:653–55
  86. Deason AJ, Belokurov V, Evans NW 2011. MNRAS 416:2903–15
  87. Deason AJ, Belokurov V, Evans NW, Johnston KV 2013. Ap. J 763:113
  88. Deason AJ, Belokurov V, Koposov SE et al. 2017. MNRAS 470:1259–73
  89. Deason AJ, Belokurov V, Koposov SE, Lancaster L 2018. Ap. J. Lett. 862:L1
  90. Deason AJ, Belokurov V, Sanders JL 2019. MNRAS 490:3426–39
  91. Dehnen W. 2000. Astron. J. 119:800–12
  92. Dekel A, Birnboim Y, Engel G et al. 2009. Nature 457:451–54
  93. Deng LC, Newberg HJ, Liu C et al. 2012. Res. Astron. Astrophys. 12:735–54
  94. Di Matteo P, Gómez A, Haywood M et al. 2015. Astron. Astrophys. 577:A1
  95. Di Matteo P, Haywood M, Lehnert MD et al. 2019. Astron. Astrophys. 632:A4
  96. Di Matteo P, Lehnert MD, Qu Y, van Driel W 2011. Astron. Astrophys. 525:L3
  97. Diemand J, Madau P, Moore B 2005. MNRAS 364:367–83
  98. Dierickx M, Klement R, Rix HW, Liu C 2010. Ap. J. Lett. 725:L186–90
  99. Dierickx MIP, Loeb A. 2017. Ap. J 836:92
  100. Dinescu DI. 2002. Omega Centauri, A Unique Window into Astrophysics F van Leeuwen, JD Hughes, G Piotto 143–54 San Francisco: Astron. Soc. Pac.
  101. Donlon T II, Newberg HJ, Weiss J, Amy P, Thompson J 2019. Ap. J 886:76
  102. Eadie G, Jurić M. 2019. Ap. J 875:159
  103. Eggen OJ, Lynden-Bell D, Sandage AR 1962. Ap. J 136:748–66
  104. El-Badry K, Bland-Hawthorn J, Wetzel A et al. 2018. MNRAS 480:652–68
  105. Elbaz D, Dickinson M, Hwang HS et al. 2011. Astron. Astrophys. 533:A119
  106. Eneev TM, Kozlov NN, Sunyaev RA 1973. Astron. Astrophys. 22:41
  107. Erkal D, Belokurov V, Laporte CFP et al. 2019. MNRAS 487:2685–700
  108. Fardal MA, van der Marel RP, Law DR et al. 2019. MNRAS 483:4724–41
  109. Fattahi A, Belokurov V, Deason AJ et al. 2019. MNRAS 484:4471–83
  110. Fernández-Alvar E, Carigi L, Schuster WJ et al. 2018. Ap. J 852:50
  111. Fernández-Trincado JG, Beers TC, Placco VM et al. 2019. Ap. J. Lett. 886:L8
  112. Font AS, Johnston KV, Bullock JS, Robertson BE 2006. Ap. J 646:886–98
  113. Fragkoudi F, Di Matteo P, Haywood M et al. 2018. Astron. Astrophys. 616:A180
  114. Frebel A, Norris JE. 2015. Annu. Rev. Astron. Astrophys. 53:631–88
  115. Freeman K, Bland-Hawthorn J. 2002. Annu. Rev. Astron. Astrophys. 40:487–537
  116. Frenk CS, White SDM. 2012. Ann. Phys. 524:507–34
  117. Fuhrmann K. 2011. MNRAS 414:2893–922
  118. Gaia Collab., Babusiaux C, van Leeuwen F et al. 2018a. Astron. Astrophys. 616:A10
  119. Gaia Collab, Brown AGA, Vallenari A et al. 2016. Astron. Astrophys. 595:A2
  120. Gaia Collab., Brown AGA, Vallenari A et al. 2018b. Astron. Astrophys. 616:A1
  121. Gaia Collab., Helmi A, van Leeuwen F et al. 2018c. Astron. Astrophys. 616:A12
  122. Gaia Collab., Katz D, Antoja T et al. 2018d. Astron. Astrophys. 616:A11
  123. Gallart C, Bernard EJ, Brook CB et al. 2019. Nat. Astron. 3:932–39
  124. Gerin M, Combes F, Athanassoula E 1990. Astron. Astrophys. 230:37–54
  125. Gibson BK, Axelrod RS, Putman ME 1999. The Third Stromlo Symposium: The Galactic Halo San Francisco: Astron. Soc. Pac.
  126. Gilliland RL, Brown TM, Christensen-Dalsgaard J et al. 2010. Publ. Astron. Soc. Pac. 122:131
  127. Gilmore G, Reid N. 1983. MNRAS 202:1025–47
  128. Gilmore G, Wyse RFG, Jones JB 1995. Astron. J. 109:1095–1111
  129. Gilmore G, Wyse RFG, Kuijken K 1989. Annu. Rev. Astron. Astrophys. 27:555–627
  130. Gilmore G, Wyse RFG, Norris JE 2002. Ap. J. Lett. 574:L39–42
  131. Gómez FA, Helmi A. 2010. MNRAS 401:2285–98
  132. Gómez FA, Helmi A, Cooper AP et al. 2013. MNRAS 436:3602–13
  133. Gómez FA, Minchev I, Villalobos Á, O'Shea BW, Williams MEK 2012. MNRAS 419:2163–72
  134. Gouda N. 2015. IAU Gen. Assembl. 29:2247720
  135. Gould A. 2003. Ap. J. Lett. 592:L63–L66
  136. Grand RJJ, Gómez FA, Marinacci F et al. 2017. MNRAS 467:179–207
  137. Grand RJJ, Helly J, Fattahi A et al. 2018. MNRAS 481:1726–43
  138. Gratton R, Bragaglia A, Carretta E et al. 2019. Astron. Astrophys. Rev. 27:8
  139. Gravity Collab, Abuter R, Amorim A et al. 2019. Astron. Astrophys. 625:L10
  140. Grillmair CJ. 2011. Ap. J 738:98
  141. Grillmair CJ, Carlin JL. 2016. Tidal Streams in the Local Group and Beyond HJ Newberg, JL Carlin 87–112 New York: Springer
  142. Hagen JHJ. 2020. Galactic dynamics in the era of Gaia PhD Thesis, Univ. Groningen, Neth .
  143. Hawkins K, Jofré P, Gilmore G, Masseron T 2014. MNRAS 445:2575–88
  144. Hayden MR, Bovy J, Holtzman JA et al. 2015. Ap. J 808:132
  145. Hayes CR, Majewski SR, Shetrone M et al. 2018. Ap. J 852:49
  146. Haynes CJ, Kobayashi C. 2019. MNRAS 483:5123–34
  147. Haywood M, Di Matteo P, Lehnert MD, Katz D, Gómez A 2013. Astron. Astrophys. 560:A109
  148. Haywood M, Di Matteo P, Lehnert MD et al. 2018. Ap. J 863:113
  149. Haywood M, Di Matteo P, Snaith O, Lehnert MD 2015. Astron. Astrophys. 579:A5
  150. Helmi A. 2004. Ap. J. Lett. 610:L97–100
  151. Helmi A. 2008. Astron. Astrophys. Rev. 15:145–88
  152. Helmi A, Babusiaux C, Koppelman HH et al. 2018. Nature 563:85–88
  153. Helmi A, de Zeeuw PT 2000. MNRAS 319:657–65
  154. Helmi A, Irwin M, Deason A et al. 2019. Messenger 175:23–25
  155. Helmi A, Navarro JF, Nordström B et al. 2006. MNRAS 365:1309–23
  156. Helmi A, Veljanoski J, Breddels MA, Tian H, Sales LV 2017. Astron. Astrophys. 598:A58
  157. Helmi A, White SDM. 1999. MNRAS 307:495–517
  158. Helmi A, White SDM, de Zeeuw PT, Zhao H 1999. Nature 402:53–55
  159. Helmi A, White SDM, Springel V 2002. Phys. Rev. D 66:063502
  160. Helmi A, White SDM, Springel V 2003. MNRAS 339:834–48
  161. Helmi A, Williams M, Freeman KC, Bland-Hawthorn J, De Silva G 2014. Ap. J 791:135
  162. Hendel D, Johnston KV. 2015. MNRAS 454:2472–85
  163. Hobbs D, Brown A, Høg E et al. 2019. arXiv:1907.12535 [astro-ph.IM]
  164. Homma H, Murayama T, Kobayashi MAR, Taniguchi Y 2015. Ap. J 799:230
  165. Hopkins PF, Kerěs D, Oñorbe J et al. 2014. MNRAS 445:581–603
  166. Ibata R, Lewis GF, Irwin M, Totten E, Quinn T 2001. Ap. J 551:294–311
  167. Ibata R, Lewis GF, Martin NF, Bellazzini M, Correnti M 2013. Ap. J. Lett. 765:L15
  168. Ibata RA, Bellazzini M, Malhan K, Martin N, Bianchini P 2019. Nat. Astron. 3:667–72
  169. Ibata RA, Gilmore G, Irwin MJ 1994. Nature 370:194–96
  170. Ibata RA, Malhan K, Martin NF 2019. Ap. J 872:152
  171. Iorio G, Belokurov V. 2019. MNRAS 482:3868–79
  172. Ishigaki MN. 2019. Star Clusters: From the Milky Way to the Early Universe A Bragaglia, M Davies, A Sills, E Vesperini 24–33 Cambridge, UK: Cambridge Univ. Press
  173. Ivezić , Goldston J, Finlator K et al. 2000. Astron. J. 120:963–77
  174. Ivezić , Kahn SM, Tyson JA et al. 2019. Ap. J 873:111
  175. Jean-Baptiste I, Di Matteo P, Haywood M et al. 2017. Astron. Astrophys. 604:A106
  176. Ji AP, Frebel A, Chiti A, Simon JD 2016. Nature 531:610–13
  177. Johnston KV. 1998. Ap. J 495:297–308
  178. Johnston KV. 2016. Tidal Streams in the Local Group and Beyond HJ Newberg, JL Carlin 141–67 New York: Springer
  179. Johnston KV, Hernquist L, Bolte M 1996. Astrophys. J. 465:278
  180. Johnston KV, Law DR, Majewski SR 2005. Ap. J 619:800–6
  181. Jurić M, Ivezić , Brooks A et al. 2008. Ap. J 673:864–914
  182. Kafle PR, Sharma S, Lewis GF, Bland-Hawthorn J 2014. Ap. J 794:59
  183. Käppeler F, Gallino R, Bisterzo S, Aoki W 2011. Rev. Mod. Phys. 83:157–94
  184. Kauffmann G, White SDM, Guiderdoni B 1993. MNRAS 264:201–18
  185. Kawata D, Chiappini C. 2016. Astron. Nachr. 337:976
  186. Kepley AA, Morrison HL, Helmi A et al. 2007. Astron. J. 134:1579–95
  187. Khanna S, Sharma S, Tepper-Garcia T et al. 2019. MNRAS 489:4962–79
  188. Kilic M, Munn JA, Harris HC et al. 2017. Ap. J 837:162
  189. Kinman TD, Cacciari C, Bragaglia A, Buzzoni A, Spagna A 2007. MNRAS 375:1381–98
  190. Klement RJ. 2010. Astron. Astrophys. Rev. 18:567–94
  191. Klypin A, Kravtsov AV, Valenzuela O, Prada F 1999. Ap. J 522:82–92
  192. Kollmeier J, Fuller J, Gaensicke B et al. 2019. Bull. Am. Astron. Soc. 51:503
  193. Koposov SE, Belokurov V, Li TS et al. 2019. MNRAS 485:4726–42
  194. Koposov SE, Rix HW, Hogg DW 2010. Ap. J 712:260–73
  195. Koppelman H, Helmi A, Veljanoski J 2018. Ap. J. Lett. 860:L11
  196. Koppelman HH, Bos ROY, Helmi A 2020. arXiv:2006.07620
  197. Koppelman HH, Helmi A, Massari D, Price-Whelan AM, Starkenburg TK 2019a. Astron. Astrophys. 631:L9
  198. Koppelman HH, Helmi A, Massari D, Roelenga S, Bastian U 2019b. Astron. Astrophys. 625:A5
  199. Kordopatis G, Hill V, Irwin M et al. 2013. Astron. Astrophys. 555:A12
  200. Kruijssen JMD, Pfeffer JL, Reina-Campos M, Crain RA, Bastian N 2019. MNRAS 486:3180–202
  201. Kunder A, Kordopatis G, Steinmetz M et al. 2017. Astron. J. 153:75
  202. Lanfranchi GA, Matteucci F. 2010. Astron. Astrophys. 512:A85
  203. Laporte CFP, Gómez FA, Besla G, Johnston KV, Garavito-Camargo N 2018a. MNRAS 473:1218–30
  204. Laporte CFP, Johnston KV, Gómez FA, Garavito-Camargo N, Besla G 2018b. MNRAS 481:286–306
  205. Laporte CFP, Minchev I, Johnston KV, Gómez FA 2019. MNRAS 485:3134–52
  206. Larsen JA, Cabanela JE, Humphreys RM 2011. Astron. J. 141:130
  207. Larsen JA, Humphreys RM. 1996. Ap. J. Lett. 468:L99–102
  208. Law DR, Majewski SR. 2010. Ap. J 718:1128–50
  209. Lee YS, Beers TC, Kim YK 2019. Ap. J 885:102
  210. Lehnert MD, Di Matteo P, Haywood M, Snaith ON 2014. Ap. J. Lett. 789:L30
  211. Levi M, Allen LE, Raichoor A et al. 2019. Bull. Am. Astron. Soc. 51:57
  212. Liang XL, Zhao JK, Oswalt TD et al. 2017. Ap. J 844:152
  213. Licquia TC, Newman JA. 2015. Ap. J 806:96
  214. Lindegren L, Hernández J, Bombrun A et al. 2018. Astron. Astrophys. 616:A2
  215. Lindegren L, Lammers U, Bastian U et al. 2016. Astron. Astrophys. 595:A4
  216. Liu C, van de Ven G 2012. MNRAS 425:2144–56
  217. Lowing B, Wang W, Cooper A et al. 2015. MNRAS 446:2274–90
  218. Mackereth JT, Bovy J. 2020. MNRAS 492:3631–46
  219. Mackereth JT, Schiavon RP, Pfeffer J et al. 2019. MNRAS 482:3426–42
  220. Majewski SR, Munn JA, Hawley SL 1994. Ap. J. Lett. 427:L37
  221. Majewski SR, Munn JA, Hawley SL 1996. Ap. J. Lett. 459:L73
  222. Majewski SR, Schiavon RP, Frinchaboy PM et al. 2017. Astron. J. 154:94
  223. Malhan K, Ibata RA. 2018. MNRAS 477:4063–76
  224. Malhan K, Ibata RA, Carlberg RG, Valluri M, Freese K 2019. Ap. J 881:106
  225. Malhan K, Ibata RA, Martin NF 2018. MNRAS 481:3442–55
  226. Maoz D, Mannucci F, Nelemans G 2014. Annu. Rev. Astron. Astrophys. 52:107–70
  227. Martell SL, Shetrone MD, Lucatello S et al. 2016. Ap. J 825:146
  228. Martinez-Valpuesta I, Gerhard O. 2013. Ap. J 766:L3
  229. Massari D, Koppelman HH, Helmi A 2019. Astron. Astrophys. 630:L4
  230. Mateu C, Read JI, Kawata D 2018. MNRAS 474:4112–29
  231. Matsuno T, Aoki W, Suda T 2019. Ap. J. Lett. 874:L35
  232. Matteucci F, Recchi S. 2001. Ap. J 558:351–58
  233. Matteucci F, Spitoni E, Rojas-Arriagada A, Schultheis M 2018. Presentation at The Galactic Bulge at the Crossroads (GBX2018), Pucón. Chile, Dec 10–14
     [Google Scholar]
  234. McMillan PJ. 2018. Res. Notes Am. Astron. Soc. 2:51
  235. McMillan PJ, Binney JJ. 2008. MNRAS 390:429–37
  236. McWilliam A. 1997. Annu. Rev. Astron. Astrophys. 35:503–56
  237. Meza A, Navarro JF, Abadi MG, Steinmetz M 2005. MNRAS 359:93–103
  238. Michel E, Baglin A, Auvergne M et al. 2008. Science 322:558
  239. Miglio A, Chiappini C, Morel T et al. 2013. MNRAS 429:423–28
  240. Minchev I, Famaey B, Quillen AC et al. 2012. Astron. Astrophys. 548:A127
  241. Minchev I, Martig M, Streich D et al. 2015. Ap. J. Lett. 804:L9
  242. Minchev I, Steinmetz M, Chiappini C et al. 2017. Ap. J 834:27
  243. Mints A, Hekker S. 2018. Astron. Astrophys. 618:A54
  244. Mo H, van den Bosch FC, White S 2010. Galaxy Formation and Evolution Cambridge, UK: Cambridge Univ. Press
  245. Mo HJ, Mao S, White SDM 1998. MNRAS 295:319–36
  246. Moore B, Ghigna S, Governato F et al. 1999. Ap. J. Lett. 524:L19–22
  247. Morrison HL. 1993. Astron. J. 105:539
  248. Morrison HL, Flynn C, Freeman KC 1990. Astron. J. 100:1191
  249. Morrison HL, Helmi A, Sun J et al. 2009. Ap. J 694:130–43
  250. Myeong GC, Evans NW, Belokurov V, Amorisco NC, Koposov SE 2018a. MNRAS 475:1537–48
  251. Myeong GC, Evans NW, Belokurov V, Sanders JL, Koposov SE 2018b. Ap. J. Lett. 863:L28
  252. Myeong GC, Vasiliev E, Iorio G, Evans NW, Belokurov V 2019. MNRAS 488:1235–47
  253. Naiman JP, Pillepich A, Springel V et al. 2018. MNRAS 477:1206–24
  254. Navarrete C, Chanamé J, Ramírez I et al. 2015. Ap. J 808:103
  255. Necib L, Lisanti M, Garrison-Kimmel S et al. 2019a. Ap. J 883:27
  256. Necib L, Ostdiek B, Lisanti M et al. 2019b. arXiv:1907.07681 [astro-ph.GA]
  257. Nelson D, Springel V, Pillepich A et al. 2019. Comput. Astrophys. Cosmol. 6:2
  258. Ness M, Bird J, Johnson J et al. 2019. Bull. Am. Astron. Soc. 51:238
  259. Ness M, Freeman K, Athanassoula E et al. 2013. MNRAS 430:836–57
  260. Newberg HJ, Carlin JL 2016. Tidal Streams in the Local Group and Beyond: Observations and Implications New York: Springer
  261. Newberg HJ, Yanny B, Rockosi C et al. 2002. Ap. J 569:245–74
  262. Nissen PE, Schuster WJ. 1997. Astron. Astrophys. 326:751–62
  263. Nissen PE, Schuster WJ. 2010. Astron. Astrophys. 511:L10
  264. Nissen PE, Schuster WJ. 2011. Astron. Astrophys. 530:A15
  265. Nordström B, Mayor M, Andersen J et al. 2004. Astron. Astrophys. 418:989–1019
  266. Norris J, Bessell MS, Pickles AJ 1985. Ap. J. Suppl. 58:463–92
  267. Norris JE. 1994. Ap. J 431:645
  268. O'Hare CAJ, Evans NW, McCabe C, Myeong G, Belokurov V 2020. Phys. Rev. D 101:023006
  269. Pasquini L, Delabre B, Ellis RS et al. 2018. Rediscovering Our Galaxy C Chiappini, I Minchev, E Starkenburg, M Valentini 242–47 Cambridge, UK: Cambridge Univ. Press
  270. Perryman MAC, Lindegren L, Kovalevsky J et al. 1997. Astron. Astrophys. 500:501–4
  271. Pillepich A, Madau P, Mayer L 2015. Ap. J 799:184
  272. Pillepich A, Nelson D, Springel V et al. 2019. MNRAS 490:3196–233
  273. Planck Collab, Aghanim N, Arnaud M et al. 2016. Astron. Astrophys. 594:A11
  274. Portail M, Wegg C, Gerhard O, Martinez-Valpuesta I 2015. MNRAS 448:713–31
  275. Posti L, Helmi A. 2019. Astron. Astrophys. 621:A56
  276. Price-Whelan AM. 2017. J. Open Source Softw. 2:18388
  277. Price-Whelan AM, Bonaca A. 2018. Ap. J. Lett. 863:L20
  278. Price-Whelan AM, Johnston KV, Valluri M et al. 2016. MNRAS 455:1079–98
  279. Price-Whelan AM, Sipocz B, Lenz D et al. 2019. adrn/gala: v1.0. Software https://zenodo.org/record/2638307#.XsiLOTpKg2w
    [Google Scholar]
  280. Purcell CW, Bullock JS, Kazantzidis S 2010. MNRAS 404:1711–18
  281. Queiroz ABA, Anders F, Santiago BX et al. 2018. MNRAS 476:2556–83
  282. Quinn PJ. 1984. Ap. J 279:596–609
  283. Quinn PJ, Hernquist L, Fullagar DP 1993. Astrophys. J. 403:74–93
  284. Rauer H, Aerts C, Cabrera J 2016. Astron. Nachr. 337:961
  285. Re Fiorentin P, Lattanzi MG, Spagna A, Curir A 2015. Astron. J. 150:128
  286. Recio-Blanco A, de Laverny P, Kordopatis G et al. 2014. Astron. Astrophys. 567:A5
  287. Richter P. 2017. Gas Accretion onto Galaxies A Fox, R Davé 15–48 New York: Springer
  288. Ricker GR, Winn JN, Vanderspek R et al. 2015. J. Astron. Telesc. Instrum. Syst. 1:014003
  289. Robin AC, Reylé C, Fliri J et al. 2014. Astron. Astrophys. 569:A13
  290. Roederer IU, Hattori K, Valluri M 2018. Astron. J. 156:179
  291. Roederer IU, Sneden C, Thompson IB, Preston GW, Shectman SA 2010. Ap. J 711:573–96
  292. Roman NG. 1950. Ap. J 112:554–59
  293. Roman NG. 2019. Annu. Rev. Astron. Astrophys. 57:1–34
  294. Sakari CM, Placco VM, Farrell EM et al. 2018. Ap. J 868:110
  295. Sales LV, Helmi A, Abadi MG et al. 2009. MNRAS 400:L61–65
  296. Sales LV, Navarro JF, Kallivayalil N, Frenk CS 2017. MNRAS 465:1879–88
  297. Sanders JL, Binney J. 2013. MNRAS 433:1813–25
  298. Sanders JL, Binney J. 2016. MNRAS 457:2107–21
  299. Sanders JL, Das P. 2018. MNRAS 481:4093–110
  300. Sanderson RE, Wetzel A, Loebman S et al. 2020. Ap. J. Suppl. 246:6
  301. Santucci RM, Beers TC, Placco VM et al. 2015. Ap. J. Lett. 813:L16
  302. Schaye J, Crain RA, Bower RG et al. 2015. MNRAS 446:521–54
  303. Schönrich R, Asplund M, Casagrande L 2011. MNRAS 415:3807–23
  304. Schönrich R, Binney J. 2009. MNRAS 399:1145–56
  305. Schuster WJ, Moitinho A, Márquez A, Parrao L, Covarrubias E 2006. Astron. Astrophys. 445:939–58
  306. Schuster WJ, Moreno E, Nissen PE, Pichardo B 2012. Astron. Astrophys. 538:A21
  307. Schwarzschild M. 1979. Ap. J 232:236–47
  308. Searle L, Zinn R. 1978. Ap. J 225:357–79
  309. Sesar B, Hernitschek N, Mitrović S et al. 2017. Astron. J. 153:204
  310. Sestito F, Longeard N, Martin NF et al. 2019. MNRAS 484:2166–80
  311. Sheffield AA, Price-Whelan AM, Tzanidakis A et al. 2018. Ap. J 854:47
  312. Shen J, Rich RM, Kormendy J et al. 2010. Ap. J. Lett. 720:L72–76
  313. Shipp N, Drlica-Wagner A, Balbinot E et al. 2018. Ap. J 862:114
  314. Simion IT, Belokurov V, Koposov SE 2019. MNRAS 482:921–28
  315. Simpson CM, Gargiulo I, Gómez FA et al. 2019. MNRAS 490:L32–37
  316. Skúladóttir Á, Hansen CJ, Salvadori S, Choplin A 2019. 631:A171
  317. Smith MC. 2016. Tidal Streams in the Local Group and Beyond HJ Newberg, JL Carlin 113–39 New York: Springer
  318. Snaith ON, Haywood M, Di Matteo P et al. 2014. Ap. J. Lett. 781:L31
  319. Sneden C, Cowan JJ, Gallino R 2008. Annu. Rev. Astron. Astrophys. 46:241–88
  320. Sneden C, Lambert DL, Whitaker RW 1979. Ap. J 234:964–72
  321. Somerville RS, Primack JR. 1999. MNRAS 310:1087–110
  322. Spite F, Spite M. 1979. Messenger 16:7–8
  323. Springel V, Wang J, Vogelsberger M et al. 2008. MNRAS 391:1685–711
  324. Starkenburg E, Oman KA, Navarro JF et al. 2017. MNRAS 465:2212–24
  325. Stonkutė E, Tautvaišienė G, Nordström B, Ženovienė R 2012. Astron. Astrophys. 541:A157
  326. Stonkutė E, Tautvaišienė G, Nordström B, Ženovienė R 2013. Astron. Astrophys. 555:A6
  327. Suda T, Katsuta Y, Yamada S et al. 2008. Publ. Astron. Soc. Jpn. 60:1159
  328. Tamura N, Takato N, Shimono A et al. 2016. Ground-based and Airborne Instrumentation for Astronomy VI, Vol. 9908 CJ Evans, L Simard, H Takami Bellingham, WA: SPIE
  329. Taylor C, Boylan-Kolchin M, Torrey P, Vogelsberger M, Hernquist L 2016. MNRAS 461:3483–93
  330. Tinsley BM. 1980. Fundam. Cosmic Phys. 5:287–388
  331. Tissera PB, Scannapieco C, Beers TC, Carollo D 2013. MNRAS 432:3391–400
  332. Tolstoy E, Hill V, Tosi M 2009. Annu. Rev. Astron. Astrophys. 47:371–425
  333. Tononi J, Torres S, García-Berro E et al. 2019. Astron. Astrophys. 628:A52
  334. Toomre A, Toomre J. 1972. Ap. J 178:623–66
  335. Travaglio C, Gallino R, Arnone E et al. 2004. Ap. J 601:864–84
  336. Tremaine S. 1999. MNRAS 307:877–83
  337. Tremonti CA, Heckman TM, Kauffmann G et al. 2004. Ap. J 613:898–913
  338. Tsujimoto T, Matsuno T, Aoki W, Ishigaki MN, Shigeyama T 2017. Ap. J. Lett. 850:L12
  339. Tumlinson J. 2010. Ap. J 708:1398–418
  340. Turon C, Primas F, Binney J et al. 2008. Messenger 134:46–49
  341. Valentini M, Chiappini C, Davies GR et al. 2017. Astron. Astrophys. 600:A66
  342. van Dokkum PG, Leja J, Nelson EJ et al. 2013. Ap. J. Lett. 771:L35
  343. Vera-Ciro C, Helmi A. 2013. Ap. J. Lett. 773:L4
  344. Villalobos Á, Helmi A. 2008. MNRAS 391:1806–27
  345. Villalobos Á, Helmi A. 2009. MNRAS 399:166–76
  346. Vincenzo F, Spitoni E, Calura F et al. 2019. MNRAS 487:L47–L52
  347. Vivas AK, Zinn R, Abad C et al. 2004. Astron. J. 127:1158–75
  348. Vogelsberger M, White SDM, Helmi A, Springel V 2008. MNRAS 385:236–54
  349. Wang J, Navarro JF, Frenk CS et al. 2011. MNRAS 413:1373–82
  350. Watkins LL, Evans NW, Belokurov V et al. 2009. MNRAS 398:1757–70
  351. Watkins LL, van der Marel RP, Sohn ST, Evans NW 2019. Ap. J 873:118
  352. Watson D, Hansen CJ, Selsing J et al. 2019. Nature 574:497–500
  353. Wegg C, Gerhard O, Bieth M 2019. MNRAS 485:3296–316
  354. Wegg C, Gerhard O, Portail M 2015. MNRAS 450:4050–69
  355. White SDM, Rees MJ. 1978. MNRAS 183:341–58
  356. White SDM, Springel V. 2000. The First Stars A Weiss, TG Abel, V Hill 327–35 New York: Springer
  357. Wilson ML, Helmi A, Morrison HL et al. 2011. MNRAS 413:2235–41
  358. Wyse RFG, Gilmore G, Norris JE et al. 2006. Ap. J. Lett. 639:L13–16
  359. Xing QF, Zhao G, Aoki W et al. 2019. Nat. Astron. 3:631–35
  360. Xue XX, Rix HW, Ma Z et al. 2015. Ap. J 809:144
  361. Yang T, Boruah SS, Afshordi N 2020. MNRAS 493:3061–80
  362. Yanny B, Newberg HJ, Kent S et al. 2000. Ap. J 540:825–41
  363. York DG, Adelman J, Anderson JE Jr. et al. 2000. Astron. J. 120:1579–87
  364. Yuan Z, Myeong GC, Beers TC et al. 2020. Ap. J 891:39
  365. Zaritsky D, McCabe K, Aravena M et al. 2016. Ap. J 818:99
  366. Ženovienė R, Tautvaišienė G, Nordström B, Stonkutė E, Barisevičius G 2015. Astron. Astrophys. 576:A113
  367. Zheng Y, Peek JEG, Putman ME, Werk JK 2019. Ap. J 871:35
  368. Zoccali M. 2019. Bol. Asoc. Argent. Astron. 61:137–44
  369. Zolotov A, Willman B, Brooks AM et al. 2009. Ap. J 702:1058–67
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Streams, Substructures, and the Early History of the Milky Way
Annual Review of Astronomy and Astrophysics 58, 205 (2020); https://doi.org/10.1146/annurev-astro-032620-021917
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