Facial reconstruction

Search LJMU Research Online

Browse Repository | Browse E-Theses

The star formation histories of dwarf galaxies in Local Group cosmological simulations

Digby, R, Navarro, JF, Fattahi, A, Simpson, CM, Oman, KA, Gomez, FA, Frenk, CS, Grand, RJJ and Pakmor, R (2019) The star formation histories of dwarf galaxies in Local Group cosmological simulations. Monthly Notices of the Royal Astronomical Society, 485 (4). pp. 5423-5437. ISSN 0035-8711

stz745.pdf - Published Version

Download (4MB) | Preview


We use the APOSTLE and Auriga cosmological simulations to study the star formation histories (SFHs) of field and satellite dwarf galaxies. Despite sizeable galaxy-to-galaxy scatter, the SFHs of APOSTLE and Auriga dwarfs exhibit robust average trends with galaxy stellar mass: faint field dwarfs (105 < Mstar/M☉ < 106) have, on average, steadily declining SFHs, whereas brighter dwarfs (107 < Mstar/M☉ < 109) show the opposite trend. Intermediate-mass dwarfs have roughly constant SFHs. Satellites exhibit similar average trends, but with substantially suppressed star formation in the most recent ∼5 Gyr, likely as a result of gas loss due to tidal and ram-pressure stripping after entering the haloes of their primaries. These simple mass and environmental trends are in good agreement with the derived SFHs of Local Group (LG) dwarfs whose photometry reaches the oldest main-sequence turn-off. SFHs of galaxies with less deep data show deviations from these trends, but this may be explained, at least in part, by the large galaxy-to-galaxy scatter, the limited sample size, and the large uncertainties of the inferred SFHs. Confirming the predicted mass and environmental trends will require deeper photometric data than currently available, especially for isolated dwarfs.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press (OUP)
SWORD Depositor: A Symplectic
Date Deposited: 19 Apr 2023 11:44
Last Modified: 19 Apr 2023 11:44
DOI or ID number: 10.1093/mnras/stz745
URI: https://researchonline.ljmu.ac.uk/id/eprint/19327
View Item View Item