The Pristine survey VIII: The metallicity distribution function of the Milky Way halo down to the extremely metal-poor regime
K. Youakim, E. Starkenburg, N. F. Martin, G. Matijevic, D. S. Aguado, C. Allende Prieto, A. Arentsen, P. Bonifacio, R. G. Carlberg, J. I. González Hernández, V.… 展开作者
K. Youakim, E. Starkenburg, N. F. Martin, G. Matijevic, D. S. Aguado, C. Allende Prieto, A. Arentsen, P. Bonifacio, R. G. Carlberg, J. I. González Hernández, V. Hill, G. Kordopatis, C. Lardo, J. F. Navarro, P. Jablonka, R. Sánchez Janssen, F. Sestito, G. F. Thomas
备注:
17 pages, 12 figures, 5 tables, accepted for publication in MNRAS
The Pristine survey uses narrow-band photometry to derive precise metallicities down to the extremely metal-poor regime ([Fe/H] < -3), and currently consists of over 4 million FGK-type stars over a sky area of $\sim 2~500\, \mathrm{deg}^2$. We focus our analysis on a subsample of $\sim 80~000$ main sequence turnoff stars with heliocentric distances between 6 and 20 kpc, which we take to be a representative sample of the inner halo. The resulting metallicity distribution function (MDF) has a peak at [Fe/H] = -1.6, and a slope of $Δ$(LogN)/$Δ[Fe/H] = 1.0 \pm 0.1$ in the metallicity range of -3.4 < [Fe/H] < -2.5. This agrees well with a simple closed-box chemical enrichment model in this range, but is shallower than previous spectroscopic MDFs presented in the literature, suggesting that there may be a larger proportion of metal-poor stars in the inner halo than previously reported. We identify the Monoceros/TriAnd/ACS/EBS/A13 structure in metallicity space in a low latitude field in the anticenter direction, and also discuss the possibility that the inner halo is dominated by a single, large merger event, but cannot strongly support or refute this idea with the current data. Finally, based on the MDF of field stars, we estimate the number of expected metal-poor globular clusters in the Milky Way halo to be 5.4 for [Fe/H] < -2.5 and 1.5 for [Fe/H] < -3, suggesting that the lack of low metallicity globular clusters in the Milky Way is not due simply to statistical undersampling.
The AGORA High-resolution Galaxy Simulations Comparison Project. VIII: Disk Formation and Evolution of Simulated Milky Way Mass Galaxy Progenitors at $1<z<5$
Seoul National University(首尔大学);University of Illinois at Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校);Osaka University(大阪大学);University of Tokyo(东京大学);University of Nevada Las Vegas(内华达大学拉斯维加斯分校);University of Connecticut(康涅狄格大学)
The Pristine Dwarf Galaxy Survey -- VII. The metallicity distributions of 12 Milky Way faint satellites
Ecole Polytechnique Fédérale de Lausanne (EPFL)(洛桑联邦理工学院);Observatoire de Paris, Université PSL, Sorbonne Université, Université Paris Cité, CY Cergy Paris Université, CNRS(巴黎天文台,巴黎文理研究大学,索邦大学,巴黎西岱大学,塞吉-蓬图瓦兹大学,法国国家科学研究中心);IFCA, Instituto de Física de Cantabria (UC-CSIC)(坎塔布里亚物理研究所(坎塔布里亚大学-西班牙国家研究委员会));Observatoire astronomique de Strasbourg, Université de Strasbourg, CNRS(斯特拉斯堡天文台,斯特拉斯堡大学,法国国家科学研究中心);Max-Planck-Institut für Astronomie(马克斯·普朗克天文学研究所);School of Astronomy and Space Science, Nanjing University(南京大学天文与空间科学学院);Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education(南京大学现代天文与天体物理教育部重点实验室);Instituto de Astrofísica de Canarias(加那利天体物理学研究所);Universidad de La Laguna(拉帕鲁纳大学);Institute of Astronomy, Unive(天文学研究所)
The Pristine Inner Galaxy Survey (PIGS) V: a chemo-dynamical investigation of the early assembly of the Milky Way with the most metal-poor stars in the bulge
Probing the Hot Gaseous Halos of Milky Way-like Galaxies in the TNG50 simulation
Xiamen University(厦门大学);Shanghai Jiao Tong University(上海交通大学);Tsinghua University(清华大学);Columbia University(哥伦比亚大学);University of Bologna(博洛尼亚大学);INAF, Astrophysics and Space Science Observatory Bologna(意大利国家天体物理研究所博洛尼亚天文台与空间科学观测站);University of Virginia(弗吉尼亚大学);Massachusetts Institute of Technology(麻省理工学院)
The Pristine survey XXIX. Data Release 2: Photometric metallicities for 15 millions stars down to $G\sim 20.5$
School of Astronomy and Space Science, Nanjing University(南京大学天文与空间科学学院);Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University, Ministry of Education(南京大学现代天文与天体物理教育部重点实验室);Institute of Astronomy, University of Cambridge(剑桥大学天文学研究所);Université de Strasbourg, CNRS, Observatoire astronomique de Strasbourg, UMR 7550(斯特拉斯堡大学、法国国家科学研究中心、斯特拉斯堡天文台);Max-Planck-Institut für Astronomie(马克斯·普朗克天文学研究所);Kapteyn Astronomical Institute, University of Groningen(格罗宁根大学卡普坦天文研究所);LIRA, Observatoire de Paris, Université PSL, Sorbonne Université, Université Paris Cité, CY Cergy Paris Université, CNRS(巴黎天文台 LIRA 实验室、巴黎文理研究大学、索邦大学、巴黎西岱大学、塞吉-蓬图瓦兹大学、法国国家科学研究中心);Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange(蔚蓝海岸大学、蔚蓝海岸天文台、法国国家科学研究中心、拉格朗日实验室)
Is the overconcentration of pristine populations in Galactic globular clusters real? An N-body approach to the problem
Main Astronomical Observatory, National Academy of Sciences of Ukraine(乌克兰国家科学院主天文台);Nicolaus Copernicus Astronomical Centre, Polish Academy of Sciences(波兰科学院尼古拉·哥白尼天体物理中心);Fesenkov Astrophysical Institute(费森可夫天体物理研究所);Department of Physics, New York University Abu Dhabi(阿布扎比纽约大学物理系);Center for Astrophysics and Space Science (CASS), New York University Abu Dhabi(阿布扎比纽约大学天体物理学与空间科学中心);Dipartimento di Fisica, Sapienza, Universitá di Roma(罗马智慧大学物理系)
ACES VIII: A Survey of Compact, High-Velocity Features Observed in CS(2-1)
University of Connecticut(康涅狄格大学);University of Florida(佛罗里达大学);University of Kansas(堪萨斯大学);Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS(中国科学院国家天文台南美天体物理中心);Instituto de Astronomía, Universidad Católica del Norte(北天主教大学天文学研究所)
Probing the kinematics of the Local Group with chemically enriched gas in the Hestia simulations
Universidad de Buenos Aires(布宜诺斯艾利斯大学);Instituto de Astronomía y Física del Espacio (IAFE, CONICET-UBA)(空间天体物理研究所);Institut für Physik und Astronomie, Universität Potsdam(波茨坦大学物理与天文学研究所);Leibniz-Institut für Astrophysik(莱布尼茨天体物理研究所);New York University Abu Dhabi(阿布扎比纽约大学);Center for Astrophysics and Space Science (CASS), New York University Abu Dhabi(阿布扎比纽约大学天体物理学与空间科学中心);Massachusetts Institute of Technology(麻省理工学院)
On the Use of Field RR Lyrae as Galactic Probes -- VIII. Early Formation of the Galactic Spheroid
ASI - Space Science Data Center(意大利航天局空间科学数据中心);Florida State University(佛罗里达州立大学);NSF NOIRLab(美国国家科学基金会NOIR天文台实验室);Vanderbilt University(范德堡大学);Space Telescope Science Institute(太空望远镜科学研究所);Dartmouth College(达特茅斯学院);University of Hawai'i at Manoa(夏威夷大学马诺阿分校);Saint Martin’s University(圣马丁大学);The University of Tokyo(东京大学);Liverpool John Moores University(利物浦约翰摩尔斯大学);National Astronomical Observatory of Japan(日本国立天文台);Cerro Tololo Inter-American Observatory/NSF NOIRLab(塞罗托洛洛美洲际天文台/美国国家科学基金会NOIR天文台实验室);Millennium Institute of Astrophysics(天体物理学千年研究所)