Rejuvenating Star Formation Activity in an Early-type Dwarf Galaxy, LEDA 1915372, with Accreted HI Gas
arXiv:2306.14456 · doi:10.3847/2041-8213/acdef1
Abstract
We report a rare astrophysical phenomenon, in which an early-type dwarf galaxy (dE), LEDA 1915372, is accreting gas from a nearby star-forming dwarf galaxy, MRK 0689, and is rejuvenating star-formation activity at the center. Both LEDA 1915372 and MRK 0689 have similar brightness of = 16.99 and 16.78 mag, respectively. They are located in a small group environment, separated by a sky-projected distance of 20.27 kpc (up to 70 kpc in three dimension), and have a relative line-of-sight radial velocity of 6 km/s. The observation of 21 cm emission with the Giant Metrewave Radio Telescope provides strong evidence of interaction between the pair dwarf galaxies in terms of neutral hydrogen (HI) morphology and kinematics. In particular, the HI map reveals that the two galaxies are clearly connected by a gas bridge, and the gas components of both LEDA 1915372 and MRK 0689 share a common direction of rotation. We also find that the HI emission peak deviates from LEDA 1915372 toward its optical blue plume, suggesting a tidal origin of ongoing central star formation. Our findings provide a new path to the formation of blue-cored dEs.
arXiv commentAccepted for publication in ApJL
References in corpus (35)
- Overview of the DESI Legacy Imaging Surveys
- CASA, the Common Astronomy Software Applications for Radio Astronomy
- Determining Star Formation Rates for Infrared Galaxies
- The O3N2 and N2 abundance indicators revisited: improved calibrations based on CALIFA and Te-based literature data
- The Arecibo Legacy Fast ALFA Survey: The ALFALFA Extragalactic HI Source Catalog
- Dwarf Elliptical Galaxies
- Galaxy Groups within 3500 km s
- 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
- Converting From 3.6 and 4.5 Micron Fluxes to Stellar Mass
- Virgo cluster early-type dwarf galaxies with the Sloan Digital Sky Survey. II. Early-type dwarfs with central star formation
- Early-type galaxies in different environments: an HI view
- Ionized gaseous nebulae chemical abundance determination using the direct method
- Action Dynamics of the Local Supercluster
- Cosmicflows-3: Two DistanceVelocity Calculators
- Extended, regular HI structures around early-type galaxies
- Go with the Flow: Understanding Inflow Mechanisms in Galaxy Collisions
- Nuclei of early-type dwarf galaxies: insights from stellar populations
- Galaxy Populations and Evolution in Clusters IV: Deep HI Observations of Dwarf Ellipticals in the Virgo Cluster
- The merger-starburst connection across cosmic times
- The HST/ACS Coma Cluster Survey: VII - Colour Gradients in Giant and Dwarf Early-Type Galaxies
- Stellar populations, neutral hydrogen and ionised gas in field early-type galaxies
- The properties of early-type galaxies in the Ursa Major cluster
- Stellar populations of Virgo cluster early-type dwarf galaxies with and without discs: a dichotomy in age?
- IC 225: a dwarf elliptical galaxy with a peculiar blue core
- Gas-Bearing Early-Type Dwarf Galaxies in Virgo: Evidence for Recent Accretion
- Young stellar populations in early-type dwarf galaxies; occurrence, radial extent and scaling relations
- Young, metal-enriched cores in early-type dwarf galaxies in the Virgo cluster based on colour gradients
- Remarkable Disk and Off-nuclear Starburst Activity in the "Tadpole Galaxy" as revealed by the Spitzer Space Telescope
- An Extensive Catalog of Early-type Dwarf Galaxies in the Local Universe: Morphology and Environment
- Starbursting Nuclei in Old Dwarf Galaxies
- Formation of Blue-cored Dwarf Early-type Galaxies in a Cluster Environment: a Kinematical Perspective
- HI in Virgo's "Red and Dead" Dwarf Ellipticals - A Tidal Tail and Central Star Formation
- The Gas Accretion History of Low Mass Halos within the Cosmic Web from Cosmological Simulations
- The discovery of blue-cored dwarf early-type galaxies in isolated environments