NAOC Open IR
The S2 stream: the shreds of a primitive dwarf galaxy
Aguado, David S.1; Myeong, G. C.1,2; Belokurov, Vasily1; Evans, N. Wyn1; Koposov, Sergey E.1,3,4; Allende Prieto, Carlos5,6; Lanfranchi, Gustavo A.7; Matteucci, Francesca8,9,10; Shetrone, Matthew11; Sbordone, Luca12; Navarrete, Camila12,13; Gonzalez Hernandez, Jonay, I5,6; Chaname, Julio13,14; de Arriba, Luis Peralta1; Yuan, Zhen15
2021
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume500Issue:1Pages:889-910
AbstractThe S2 stream is a kinematically cold stream that is plunging downwards through the Galactic disc. It may be part of a hotter and more diffuse structure called the Helmi stream. We present a multi-instrument chemical analysis of the stars in the metal-poor S2 stream using both high- and low-resolution spectroscopy, complemented with a re-analysis of the archival data to give a total sample of 62 S2 members. Our high-resolution program provides alpha-elements (C, Mg, Si, Ca, and Ti), iron-peak elements (V, Cr, Mn, Fe, Ni), n-capture process elements (Sr, Ba), and other elements such as Li, Na, Al, and Sc for a subsample of S2 objects. We report coherent abundance patterns over a large metallicity spread (similar to 1 dex) confirming that the S2 stream was produced by a disrupted dwarf galaxy. The combination of S2's alpha-elements displays a mildly decreasing trend with increasing metallicity, which can be tentatively interpreted as a 'knee' at [Fe/H] < -2. At the low-metallicity end, the n-capture elements in S2 may be dominated by r-process production; however, several stars are Ba-enhanced but unusually poor in Sr. Moreover, some of the low-[Fe/H] stars appear to be carbon-enhanced. We interpret the observed abundance patterns with the help of chemical evolution models that demonstrate the need for modest star formation efficiency and low wind efficiency confirming that the progenitor of S2 was a primitive dwarf galaxy.
Keywordstars: abundances Galaxy: evolution Galaxy: formation Galaxy: halo Galaxy: kinematics and dynamics
Funding OrganizationSpanish MINECO ; Spanish MINECO ; University of Texas at Austin McDonald Observatory ; University of Texas at Austin McDonald Observatory ; University of Texas at Department of Astronomy ; University of Texas at Department of Astronomy ; Pennsylvania State University ; Pennsylvania State University ; Leverhulme Trust ; Leverhulme Trust ; NSF ; NSF ; Heising-Simons Foundation ; Heising-Simons Foundation ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish MICINN ; Spanish MICINN ; Brazilian agency FAPESP ; Brazilian agency FAPESP ; Spanish MINECO ; Spanish MINECO ; University of Texas at Austin McDonald Observatory ; University of Texas at Austin McDonald Observatory ; University of Texas at Department of Astronomy ; University of Texas at Department of Astronomy ; Pennsylvania State University ; Pennsylvania State University ; Leverhulme Trust ; Leverhulme Trust ; NSF ; NSF ; Heising-Simons Foundation ; Heising-Simons Foundation ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish MICINN ; Spanish MICINN ; Brazilian agency FAPESP ; Brazilian agency FAPESP ; Spanish MINECO ; Spanish MINECO ; University of Texas at Austin McDonald Observatory ; University of Texas at Austin McDonald Observatory ; University of Texas at Department of Astronomy ; University of Texas at Department of Astronomy ; Pennsylvania State University ; Pennsylvania State University ; Leverhulme Trust ; Leverhulme Trust ; NSF ; NSF ; Heising-Simons Foundation ; Heising-Simons Foundation ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish MICINN ; Spanish MICINN ; Brazilian agency FAPESP ; Brazilian agency FAPESP ; Spanish MINECO ; Spanish MINECO ; University of Texas at Austin McDonald Observatory ; University of Texas at Austin McDonald Observatory ; University of Texas at Department of Astronomy ; University of Texas at Department of Astronomy ; Pennsylvania State University ; Pennsylvania State University ; Leverhulme Trust ; Leverhulme Trust ; NSF ; NSF ; Heising-Simons Foundation ; Heising-Simons Foundation ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish MICINN ; Spanish MICINN ; Brazilian agency FAPESP ; Brazilian agency FAPESP
DOI10.1093/mnras/staa3250
WOS KeywordMETAL-POOR STARS ; HIGH-RESOLUTION SPECTROSCOPY ; CORE-COLLAPSE SUPERNOVAE ; HORIZONTAL-BRANCH STARS ; ACCRETED STELLAR HALO ; LTE LINE FORMATION ; ALL-SKY VIEW ; MILKY-WAY ; CHEMICAL EVOLUTION ; GIANT BRANCH
Language英语
Funding ProjectSpanish MINECO[AYA 2011-24052] ; Spanish MINECO[AYA 2014-55216] ; University of Texas at Austin McDonald Observatory ; University of Texas at Department of Astronomy ; Pennsylvania State University ; Leverhulme Trust ; NSF[AST-1813881] ; NSF[AST-1909584] ; Heising-Simons Foundation[2018-1030] ; Spanish Ministry of Science and Innovation (MICINN)[AYA2017-86389-P] ; Spanish MICINN[RYC-2013-14875] ; Brazilian agency FAPESP[2014/11156-4] ; Brazilian agency FAPESP[2017/25799-2]
Funding OrganizationSpanish MINECO ; Spanish MINECO ; University of Texas at Austin McDonald Observatory ; University of Texas at Austin McDonald Observatory ; University of Texas at Department of Astronomy ; University of Texas at Department of Astronomy ; Pennsylvania State University ; Pennsylvania State University ; Leverhulme Trust ; Leverhulme Trust ; NSF ; NSF ; Heising-Simons Foundation ; Heising-Simons Foundation ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish MICINN ; Spanish MICINN ; Brazilian agency FAPESP ; Brazilian agency FAPESP ; Spanish MINECO ; Spanish MINECO ; University of Texas at Austin McDonald Observatory ; University of Texas at Austin McDonald Observatory ; University of Texas at Department of Astronomy ; University of Texas at Department of Astronomy ; Pennsylvania State University ; Pennsylvania State University ; Leverhulme Trust ; Leverhulme Trust ; NSF ; NSF ; Heising-Simons Foundation ; Heising-Simons Foundation ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish MICINN ; Spanish MICINN ; Brazilian agency FAPESP ; Brazilian agency FAPESP ; Spanish MINECO ; Spanish MINECO ; University of Texas at Austin McDonald Observatory ; University of Texas at Austin McDonald Observatory ; University of Texas at Department of Astronomy ; University of Texas at Department of Astronomy ; Pennsylvania State University ; Pennsylvania State University ; Leverhulme Trust ; Leverhulme Trust ; NSF ; NSF ; Heising-Simons Foundation ; Heising-Simons Foundation ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish MICINN ; Spanish MICINN ; Brazilian agency FAPESP ; Brazilian agency FAPESP ; Spanish MINECO ; Spanish MINECO ; University of Texas at Austin McDonald Observatory ; University of Texas at Austin McDonald Observatory ; University of Texas at Department of Astronomy ; University of Texas at Department of Astronomy ; Pennsylvania State University ; Pennsylvania State University ; Leverhulme Trust ; Leverhulme Trust ; NSF ; NSF ; Heising-Simons Foundation ; Heising-Simons Foundation ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish Ministry of Science and Innovation (MICINN) ; Spanish MICINN ; Spanish MICINN ; Brazilian agency FAPESP ; Brazilian agency FAPESP
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000599134600064
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/80239
Collection中国科学院国家天文台
Corresponding AuthorAguado, David S.
Affiliation1.Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England
2.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
3.Carnegie Mellon Univ, McWilliams Ctr Cosmol, Pittsburgh, PA 15213 USA
4.Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland
5.Inst Astrofis Canarias, Via Lactea, E-38205 Tenerife, Spain
6.Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain
7.Univ Cidade Sao Paulo, Nucleo Astrofis Teor, R Galvao Bueno 868, BR-01506000 Sao Paulo, SP, Brazil
8.Univ Trieste, Sez Astron, Dipartimento Fis, Via GB Tiepolo 11, I-34131 Trieste, Italy
9.INAF Osservatorio Astron Trieste, Via GB Tiepolo 11, I-34131 Trieste, Italy
10.Ist Nazl Fis Nucl, Sez Trieste, Via Valerio 2, I-34134 Trieste, Italy
11.Univ Calif Santa Cruz, Univ Calif Observ, Santa Cruz, CA 95064 USA
12.European Southern Observ, ESO, Alonso Cordova 3107, Santiago, Chile
13.Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436, Chile
14.Pontificia Univ Catolica Chile, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago 7820436, Chile
15.Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Aguado, David S.,Myeong, G. C.,Belokurov, Vasily,et al. The S2 stream: the shreds of a primitive dwarf galaxy[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,500(1):889-910.
APA Aguado, David S..,Myeong, G. C..,Belokurov, Vasily.,Evans, N. Wyn.,Koposov, Sergey E..,...&Yuan, Zhen.(2021).The S2 stream: the shreds of a primitive dwarf galaxy.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,500(1),889-910.
MLA Aguado, David S.,et al."The S2 stream: the shreds of a primitive dwarf galaxy".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 500.1(2021):889-910.
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