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A Headless Tadpole Galaxy: The High Gas-phase Metallicity of the Ultra-diffuse Galaxy UGC 2162

AuthorsSánchez Almeida, J.; Olmo-García, A.; Elmegreen, B. G.; Elmegreen, D. M.; Filho, M.; Muñoz-Tuñón, C.; Pérez Montero, Enrique ; Román, J.
KeywordsGalaxies: abundances
Galaxies: evolution
Galaxies: formation
Galaxies:fundamental parameters
Galaxies: star formation
Intergalactic medium
Issue Date2018
PublisherIOP Publishing
CitationAstrophysical Journal 869(1): 40 (2018)
AbstractThe 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 () 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.© 2018. The American Astronomical Society. All rights reserved.
DescriptionAccepted for publication in ApJ. 10 pages. 5 figures
Publisher version (URL)http://dx.doi.org/10.3847/1538-4357/aae9f3
Identifiersdoi: 10.3847/1538-4357/aae9f3
issn: 1538-4357
Appears in Collections:(IAA) Artículos
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