SIMBAD references

2018ApJ...869...40S - Astrophys. J., 869, 40-40 (2018/December-2)

A headless tadpole galaxy: the high gas-phase metallicity of the ultra-diffuse galaxy UGC 2162.

SANCHEZ ALMEIDA J., OLMO-GARCIA A., ELMEGREEN B.G., ELMEGREEN D.M., FILHO M., MUNOZ-TUNON C., PEREZ-MONTERO E. and ROMAN J.

Abstract (from CDS):

The cosmological numerical simulations tell us that accretion of external metal-poor gas drives star formation (SF) in galaxy disks. One the best pieces of observational evidence supporting this prediction is the existence of low-metallicity star-forming regions in relatively high-metallicity host galaxies. The SF is thought to be fed by metal-poor gas recently accreted. Since the gas accretion is stochastic, there should be galaxies with all the properties of a host but without the low-metallicity starburst. These galaxies have not been identified yet. The exception may be UGC 2162, a nearby ultra-diffuse galaxy (UDG) that combines low surface brightness and relatively high metallicity. We confirm the high metallicity of UGC 2162 (12+log(O/H)=8.52–0.24+0.27) using spectra taken with the 10 m GTC telescope. UGC 2162 has the stellar mass, metallicity, and star formation rate surface density expected for a host galaxy in between outbursts. This fact suggests a physical connection between some UDGs and metal-poor galaxies, which may be the same type of object in a different phase of the SF cycle. UGC 2162 is a high-metallicity outlier of the mass-metallicity relation, a property shared by the few UDGs with known gas-phase metallicity.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: abundances - galaxies: evolution - galaxies: formation - galaxies: fundamental parameters - galaxies: star formation - intergalactic medium

Simbad objects: 5

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2021.08.01-14:21:29

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