Projects per year
Abstract
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 ≥ MV ≥ −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 satellite luminosity) are reproduced in the simulations while others
(dependence of SFH on galactocentric distance, presence of the
delayed-quenching population) are weaker or absent. We provide all
photometric catalogs and SFHs as High-Level Science Products on MAST.
Original language | English |
---|---|
Article number | 205 |
Pages (from-to) | 1-36 |
Number of pages | 36 |
Journal | Astrophysical Journal |
Volume | 979 |
Issue number | 2 |
DOIs | |
Publication status | Published - 28 Jan 2025 |
Fingerprint
Dive into the research topics of 'The Hubble Space Telescope Survey of M31 Satellite Galaxies IV. Survey Overview and Lifetime Star Formation Histories'. Together they form a unique fingerprint.Projects
- 1 Active
-
The Archaeological Record in Local Galaxy Stellar Halos
Science and Technology Facilities Council
1/04/24 → 31/03/27
Project: Research