Star Formation Histories of Dwarf Spheroidal and Dwarf Elliptical
Galaxies in the Local Universe
M. Seo, and H. Ann. (2023)cite arxiv:2301.10386Comment: 16 pages, 16 figures.
Abstract
We present the star formation histories (SFHs) of early-type dwarf galaxies,
dSphs and dEs, in the local universe within z=0.01. The SFHs of early-type
dwarf galaxies are characterized by pre-enriched, metal-poor old stellar
populations, absence of moderately old stars that have ages of a few Gyr. There
are some differences in the SFHs of dSphs and dEs. In particular, dSphs formed
old ($\gtrsim10$ Gyr old) metal-poor stars $\sim2$ times more than dEs. The
effects of reionization and feedback from supernova explosions are thought to
be strong enough to remove the gas left, which prevent moderately old stellar
populations in dSphs. In contrast, the ejected gas are not completely removed
from dEs and fall back to ignite burst of star formation at a few Gyr after the
first period of violent bursts of star formation, showing a suppression of star
formation at lookback time $9.6$ Gyr. The second peak of star formation
at lookback time $4.5$ Gyr in dEs produce moderately old stellar
populations. Distinction between dSphs and dEs is useful to examine the SFHS of
the early-type dwarfs since the cumulative SFHs are most closely related to
their morphology. The stellar mass plays an important role in the SFHs of the
early-type dwarfs as a driver of star formation, especially in galaxies with
primordial origin.
Description
Star Formation Histories of Dwarf Spheroidal and Dwarf Elliptical Galaxies in the Local Universe
%0 Generic
%1 seo2023formation
%A Seo, Mira
%A Ann, H. B.
%D 2023
%K SFR dwarf galaxies
%T Star Formation Histories of Dwarf Spheroidal and Dwarf Elliptical
Galaxies in the Local Universe
%U http://arxiv.org/abs/2301.10386
%X We present the star formation histories (SFHs) of early-type dwarf galaxies,
dSphs and dEs, in the local universe within z=0.01. The SFHs of early-type
dwarf galaxies are characterized by pre-enriched, metal-poor old stellar
populations, absence of moderately old stars that have ages of a few Gyr. There
are some differences in the SFHs of dSphs and dEs. In particular, dSphs formed
old ($\gtrsim10$ Gyr old) metal-poor stars $\sim2$ times more than dEs. The
effects of reionization and feedback from supernova explosions are thought to
be strong enough to remove the gas left, which prevent moderately old stellar
populations in dSphs. In contrast, the ejected gas are not completely removed
from dEs and fall back to ignite burst of star formation at a few Gyr after the
first period of violent bursts of star formation, showing a suppression of star
formation at lookback time $9.6$ Gyr. The second peak of star formation
at lookback time $4.5$ Gyr in dEs produce moderately old stellar
populations. Distinction between dSphs and dEs is useful to examine the SFHS of
the early-type dwarfs since the cumulative SFHs are most closely related to
their morphology. The stellar mass plays an important role in the SFHs of the
early-type dwarfs as a driver of star formation, especially in galaxies with
primordial origin.
@misc{seo2023formation,
abstract = {We present the star formation histories (SFHs) of early-type dwarf galaxies,
dSphs and dEs, in the local universe within z=0.01. The SFHs of early-type
dwarf galaxies are characterized by pre-enriched, metal-poor old stellar
populations, absence of moderately old stars that have ages of a few Gyr. There
are some differences in the SFHs of dSphs and dEs. In particular, dSphs formed
old ($\gtrsim10$ Gyr old) metal-poor stars $\sim2$ times more than dEs. The
effects of reionization and feedback from supernova explosions are thought to
be strong enough to remove the gas left, which prevent moderately old stellar
populations in dSphs. In contrast, the ejected gas are not completely removed
from dEs and fall back to ignite burst of star formation at a few Gyr after the
first period of violent bursts of star formation, showing a suppression of star
formation at lookback time $\approx 9.6$ Gyr. The second peak of star formation
at lookback time $\approx 4.5$ Gyr in dEs produce moderately old stellar
populations. Distinction between dSphs and dEs is useful to examine the SFHS of
the early-type dwarfs since the cumulative SFHs are most closely related to
their morphology. The stellar mass plays an important role in the SFHs of the
early-type dwarfs as a driver of star formation, especially in galaxies with
primordial origin.},
added-at = {2023-01-26T09:40:07.000+0100},
author = {Seo, Mira and Ann, H. B.},
biburl = {https://www.bibsonomy.org/bibtex/27c38b3a51cc4595e052e0c935ce4d618/quark75},
description = {Star Formation Histories of Dwarf Spheroidal and Dwarf Elliptical Galaxies in the Local Universe},
interhash = {6f181cd60961512745d986e5102d0e10},
intrahash = {7c38b3a51cc4595e052e0c935ce4d618},
keywords = {SFR dwarf galaxies},
note = {cite arxiv:2301.10386Comment: 16 pages, 16 figures},
timestamp = {2023-01-26T09:40:07.000+0100},
title = {Star Formation Histories of Dwarf Spheroidal and Dwarf Elliptical
Galaxies in the Local Universe},
url = {http://arxiv.org/abs/2301.10386},
year = 2023
}