Two Ultra-faint Milky Way Stellar Systems Discovered in Early Data from the DECam Local Volume Exploration Survey
文献类型：期刊论文
| 作者 | Mau, S.112; Cerny, W.; Pace, A. B.; Choi, Y.; Drlica-Wagner, A.; Santana-Silva, L.; Riley, A. H.; Erkal, D.; Stringfellow, G. S.; Adamow, M. |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2020-02-20 |
| 卷号 | 890期号:2页码:12 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab6c67 |
| 通讯作者 | Mau, S.(sidneymau@uchicago.edu) |
| 英文摘要 | We report the discovery of two ultra-faint stellar systems found in early data from the DECam Local Volume Exploration survey (DELVE). The first system, Centaurus I (DELVE J1238-4054), is identified as a resolved overdensity of old and metal-poor stars with a heliocentric distance of D-circle dot = 116.3(-0.6)(+0.6) kpc, a half-light radius of r(h) = 2.3(-0.3)(+0.4) arcmin, an age of tau > 12.85 Gyr, a metallicity of Z = 0.0002(-0.0002)(+0.0001), and an absolute magnitude of M-V = -5.55(-0.11)(+0.11) mag. This characterization is consistent with the population of ultra-faint satellites, and confirmation of this system would make Centaurus I one of the brightest recently discovered ultra-faint dwarf galaxies. Centaurus I is detected in Gaia DR2 with a clear and distinct proper motion signal, confirming that it is a real association of stars distinct from the Milky Way foreground; this is further supported by the clustering of blue horizontal branch stars near the centroid of the system. The second system, DELVE 1 (DELVE J1630-0058), is identified as a resolved overdensity of stars with a heliocentric distance of D-circle dot = 19.0(-0.6)(+0.5) kpc, a half-light radius of r(h) = 0.97(-0.17)(+0.24) arcmin, an age of tau = 12.5(-0.7)(+1.0) Gyr, a metallicity of Z = 0.0005(-0.0001)(+0.0002), and an absolute magnitude of M-V = -0.2(-0.6)(+0.8) mag, consistent with the known population of faint halo star clusters. Given the low number of probable member stars at magnitudes accessible with Gaia DR2, a proper motion signal for DELVE 1 is only marginally detected. We compare the spatial position and proper motion of both Centaurus I and DELVE 1 with simulations of the accreted satellite population of the Large Magellanic Cloud (LMC) and find that neither is likely to be associated with the LMC. |
| WOS关键词 | GLOBULAR-CLUSTER SYSTEMS ; DWARF GALAXIES ; DARK-MATTER ; MAGELLANIC STREAM ; TOTAL MASS ; ACS SURVEY ; ALL-SKY ; SATELLITE ; POPULATION ; EFFICIENT |
| 资助项目 | University of Chicago Provost's Scholar Award ; NSF[AST-1813881] ; NSF[AST-1816196] ; NSF[AST-1821987] ; NSF[AST-1821967] ; NSF[AST-1813708] ; NSF[AST-1813466] ; NSF[AST-1908972] ; CONICYT FONDECYT Regular grant[1181797] ; NASA Fermi Guest Investigator Program Cycle 9[91201] ; Fermilab LDRD project[L2019-011] ; DOE (USA) ; NSF (USA) ; MISE (Spain) ; STFC (UK) ; HEFCE (UK) ; NCSA(UIUC) ; KICP (U. Chicago) ; CCAPP (Ohio State) ; MIFPA (Texas AM University) ; CNPQ ; FAPERJ ; FINEP (Brazil) ; MINECO (Spain) ; DFG (Germany) ; Argonne Lab ; UC Santa Cruz ; University of Cambridge ; CIEMAT-Madrid ; University of Chicago ; University College London ; DES-Brazil Consortium ; University of Edinburgh ; ETH Zurich ; Fermilab ; University of Illinois ; ICE (IEEC-CSIC) ; IFAE Barcelona ; Lawrence Berkeley Lab ; LMU Munchen ; associated Excellence Cluster Universe ; University of Michigan ; NSF's National Optical-Infrared Astronomy Research Laboratory ; University of Nottingham ; Ohio State University ; OzDES Membership Consortium University of Pennsylvania ; University of Portsmouth ; SLAC National Lab ; Stanford University ; University of Sussex ; Texas AM University ; US Department of Energy, Office of Science, Office of High Energy Physics[DE-AC02-07CH11359] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000522100700045 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | University of Chicago Provost's Scholar Award ; NSF ; CONICYT FONDECYT Regular grant ; NASA Fermi Guest Investigator Program Cycle 9 ; Fermilab LDRD project ; DOE (USA) ; NSF (USA) ; MISE (Spain) ; STFC (UK) ; HEFCE (UK) ; NCSA(UIUC) ; KICP (U. Chicago) ; CCAPP (Ohio State) ; MIFPA (Texas AM University) ; CNPQ ; FAPERJ ; FINEP (Brazil) ; MINECO (Spain) ; DFG (Germany) ; Argonne Lab ; UC Santa Cruz ; University of Cambridge ; CIEMAT-Madrid ; University of Chicago ; University College London ; DES-Brazil Consortium ; University of Edinburgh ; ETH Zurich ; Fermilab ; University of Illinois ; ICE (IEEC-CSIC) ; IFAE Barcelona ; Lawrence Berkeley Lab ; LMU Munchen ; associated Excellence Cluster Universe ; University of Michigan ; NSF's National Optical-Infrared Astronomy Research Laboratory ; University of Nottingham ; Ohio State University ; OzDES Membership Consortium University of Pennsylvania ; University of Portsmouth ; SLAC National Lab ; Stanford University ; University of Sussex ; Texas AM University ; US Department of Energy, Office of Science, Office of High Energy Physics |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/6441]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Mau, S. |
| 作者单位 | 1.Univ Barcelona, ICCUB, IEEC UB, Barcelona, Spain 2.Univ Lodz, Dept Astrophys, Lodz, Poland 3.Univ Complutense Madrid, EMFTEL Dept, Madrid, Spain 4.Univ Complutense Madrid, IPARCOS Inst, Madrid, Spain 5.CBPF, Rio De Janeiro, Brazil 6.HBNI, Saha Inst Nucl Phys, Kolkata, India 7.Univ Zagreb, Croatian Consortium, FER, Zagreb, Croatia 8.Tech Univ Dortmund, Dortmund, Germany 9.Swiss Fed Inst Technol, Zurich, Switzerland 10.Natl Inst Astrophys INAF, Rome, Italy |
| 推荐引用方式 GB/T 7714 | Mau, S.,Cerny, W.,Pace, A. B.,et al. Two Ultra-faint Milky Way Stellar Systems Discovered in Early Data from the DECam Local Volume Exploration Survey[J]. ASTROPHYSICAL JOURNAL,2020,890(2):12. |
| APA | Mau, S..,Cerny, W..,Pace, A. B..,Choi, Y..,Drlica-Wagner, A..,...&Wechsler, R. H..(2020).Two Ultra-faint Milky Way Stellar Systems Discovered in Early Data from the DECam Local Volume Exploration Survey.ASTROPHYSICAL JOURNAL,890(2),12. |
| MLA | Mau, S.,et al."Two Ultra-faint Milky Way Stellar Systems Discovered in Early Data from the DECam Local Volume Exploration Survey".ASTROPHYSICAL JOURNAL 890.2(2020):12. |
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