Article Dans Une Revue The Astrophysical Journal Année : 2025

The Hubble Space Telescope Survey of M31 Satellite Galaxies. IV. Survey Overview and Lifetime Star Formation Histories

1 Department of Astronomy [Berkeley]
2 Raytheon, 1151 E. Hermans Road, Tucson, AZ 85756, USA
3 Steward Observatory
4 Department of Astronomy [Charlottesville]
5 Department of Physics and Astronomy, University of California, Davis, CA 95616, USA
6 STSci - Space Telescope Science Institute
7 Department of Astronomy [Austin]
8 Department of Physics and Astronomy [Irvine]
9 School of Natural Sciences, University of Tasmania, Private Bag 37, Hobart, Tasmania 7001, Australia
10 Department of Physics, University of Surrey, Guildford GU2 7XH, UK
11 ICC - Institute for Computational Cosmology
12 Department of Physics and Astronomy [Hanover]
13 Eureka Scientific
14 IfA - Institute for Astronomy [Edinburgh]
15 School of Data Science, University of Virginia, 1919 Ivy Road, Charlottesville, VA 22903, USA
16 Department of Astronomy [New Haven]
17 UCO/Lick Observatory
18 ObAS - Observatoire astronomique de Strasbourg
19 Institute of Astronomy [Cambridge]
20 School of Space Research, Kyung Hee University
21 Department of Physics & Astronomy, University of Notre Dame, Notre Dame, IN 46556, USA
22 SIfA - Sydney Institute for Astronomy
23 RSAA - Research School of Astronomy and Astrophysics [Canberra]
24 NRC Herzberg Astronomy and Astrophysics
25 Department of Physics and Astronomy, Department of Physics and Astronomy, University of Utah, 115 South 1400 East, Salt Lake City, UT 84112, USA
26 Department of Physics and Astronomy [UCLA, Los Angeles]
27 School of Physics and Astronomy [Minneapolis]
28 The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA
Alessandro Savino
Daniel R Weisz
Meredith J Durbin
Gurtina Besla
Mark Fardal
Marla C Geha
Puragra Guhathakurta
Michael J Irwin
Geraint F Lewis
Nicolas Martin

Résumé

From >1000 orbits of HST imaging, we present deep homogeneous resolved star color-magnitude diagrams that reach the oldest main-sequence turnoff and uniformly measured star formation histories (SFHs) of 36 dwarf galaxies (-6 M V -17) associated with the M31 halo, and for 10 additional fields in M31, M33, and the Giant Stellar Stream. From our SFHs, we find: (i) The median stellar age and quenching epoch of M31 satellites correlate with galaxy luminosity and galactocentric distance. Satellite luminosity and present-day distance from M31 predict the satellite quenching epoch to within 1.8 Gyr at all epochs. This tight relationship highlights the fundamental connection between satellite halo mass, environmental history, and star formation duration. (ii) There is no difference between the median SFH of galaxies on and off the great plane of Andromeda satellites. (iii) ~50% of our M31 satellites show prominent ancient star formation (>12 Gyr ago) followed by delayed quenching (8-10 Gyr ago), which is not commonly observed among the MW satellites. (iv) A comparison with TNG50 and FIRE-2 simulated satellite dwarfs around M31-like hosts shows that some of these trends (dependence of SFH on

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insu-04929407 , version 1 (04-02-2025)

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Alessandro Savino, Daniel R Weisz, Andrew E Dolphin, Meredith J Durbin, Nitya Kallivayalil, et al.. The Hubble Space Telescope Survey of M31 Satellite Galaxies. IV. Survey Overview and Lifetime Star Formation Histories. The Astrophysical Journal, 2025, 979 (2), pp.205. ⟨10.3847/1538-4357/ada24f⟩. ⟨insu-04929407⟩
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