Star Formation Histories of Dwarf Spheroidal and Dwarf Elliptical Galaxies in the Local Universe

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 ($\gtrsim 10$ Gyr old) metal-poor stars $\sim 2$ 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.

16 pages, 16 figures

References in corpus (41)

• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• Observational constraints on Cosmic Reionization
• Updated Nearby Galaxy Catalog
• The Star Formation Histories of Local Group Dwarf Galaxies I. Hubble Space Telescope / Wide Field Planetary Camera 2 Observations
• The Quenching of the Ultra-Faint Dwarf Galaxies in the Reionization Era
• A Classical Morphological Analysis of Galaxies in the Spitzer Survey of Stellar Structure in Galaxies (S4G)
• The Low-z Intergalactic Medium. III. HI and Metal Absorbers at z<0.4
• The origin of dwarf ellipticals in the Virgo cluster
• Segue 1: An Unevolved Fossil Galaxy from the Early Universe
• Virgo cluster early-type dwarf galaxies with the Sloan Digital Sky Survey. III. Subpopulations: distributions, shapes, origins
• Virgo cluster early-type dwarf galaxies with the Sloan Digital Sky Survey. I. On the possible disk nature of bright early-type dwarfs
• The Star Formation Histories of Local Group Dwarf Galaxies II. Searching For Signatures of Reionization
• Simulating cosmic metal enrichment by the first galaxies
• The Star Formation Histories of Local Group Dwarf Galaxies III. Characterizing Quenching in Low-Mass Galaxies
• The X-shooter/ALMA Sample of Quasars in the Epoch of Reionization. II. Black Hole Masses, Eddington Ratios, and the Formation of the First Quasars
• Life and times of dwarf spheroidal galaxies
• SIDM on FIRE: Hydrodynamical Self-Interacting Dark Matter simulations of low-mass dwarf galaxies
• Star formation feedback and metal enrichment by SN Ia and SN II in dwarf spheroidal galaxies: the case of Draco
• Stellar Kinematics and Structural Properties of Virgo Cluster Dwarf Early-Type Galaxies from the SMAKCED Project III. Rotation versus Pressure Support
• Catalog of Visually Classified Galaxies in the Local ($z\sim 0.01$) Universe
• The cumulative star-formation histories of dwarf galaxies with TNG50. I: Environment-driven diversity and connection to quenching
• Comparing the Quenching Times of Faint M31 and Milky Way Satellite Galaxies
• Determining star-formation rates in Active Galactic Nuclei hosts via stellar population synthesis
• The star formation history of the Sextans dwarf spheroidal galaxy: a true fossil of the pre-reionization era
• The star formation history of the Sculptor dwarf spheroidal galaxy
• SDSS-IV MaNGA: Faint quenched galaxies I- Sample selection and evidence for environmental quenching
• Star formation histories of the LEGUS dwarf galaxies (III): the non-bursty nature of 23 star forming dwarf galaxies
• The star formation history of Eridanus II: on the role of SNe feedback in the quenching of ultra-faint dwarf galaxies
• The infall of dwarf satellite galaxies are influenced by their host's massive accretions
• A galaxy classification grid that better recognises early-type galaxy morphology
• The Effects of Ram-pressure Stripping and Supernova Winds on the Tidal Stirring of Disky Dwarfs: Enhanced Transformation into Dwarf Spheroidals
• Young stellar populations in early-type dwarf galaxies; occurrence, radial extent and scaling relations
• The properties of dwarf spheroidal galaxies in the Cen A group: Stellar populations, internal dynamics, and a heart-shaped Halpha ring
• Tidal Interaction as the origin of early-type dwarf galaxies in group environment
• Star formation history of And XVIII: a dwarf spheroidal galaxy in isolation
• A MegaCam Survey of Outer Halo Satellites. VI: The Spatially Resolved Star Formation History of the Carina Dwarf Spheroidal Galaxy
• The accretion history of the Milky Way. I. How it shapes globular clusters and dwarf galaxies
• The Isaac Newton Telescope monitoring survey of Local Group dwarf galaxies -- IV. The star formation history of Andromeda VII derived from long period variable stars
• Determining Satellite Infall Times Using Machine Learning
• Morphology of Dwarf Galaxies in Isolated Satellite Systems
• Luminosity Distribution of Dwarf Elliptical-like Galaxies

Cited by in corpus (1)

• Gamma Analytical Modeling Evolution (GAME) I: The physical implications of deriving the stellar mass functions from z=0 to z=8