One Hundred SMUDGes in S-PLUS: Ultra-diffuse Galaxies Flourish in the Field
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Author
Barbosa, C. E.Zaritsky, D.
Donnerstein, R.
Zhang, H.
Dey, A.
de Oliveira, C. Mendes
Sampedro, L.
Molino, A.
Costa-Duarte, M. V.
Coelho, P.
Cortesi, A.
Herpich, F. R.
Hernandez-Jimenez, J. A.
Santos-Silva, T.
Pereira, E.
Werle, A.
Overzier, R. A.
Cid Fernandes, R.
Castelli, A. V. Smith
Ribeiro, T.
Schoenell, W.
Kanaan, A.
Affiliation
Univ Arizona, Steward ObservIssue Date
2020-03-16
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IOP PUBLISHING LTDCitation
C. E. Barbosa et al 2020 ApJS 247 46Rights
Copyright © 2020. The American Astronomical Society. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We present the first systematic study of the stellar populations of ultra-diffuse galaxies (UDGs) in the field, integrating the large area search and characterization of UDGs by the SMUDGes survey with the twelve-band optical photometry of the S-PLUS survey. Based on Bayesian modeling of the optical colors of UDGs, we determine the ages, metallicities, and stellar masses of 100 UDGs distributed in an area of similar to 330 deg(2) in the Stripe 82 region. We find that the stellar masses and metallicities of field UDGs are similar to those observed in clusters and follow the trends previously defined in studies of dwarf and giant galaxies. However, field UDGs have younger luminosity-weighted ages than do UDGs in clusters. We interpret this result to mean that field UDGs have more extended star formation histories, including some that continue to form stars at low levels to the present time. Finally, we examine stellar population scaling relations that show that UDGs are, as a population, similar to other low surface brightness galaxies.ISSN
0067-0049Version
Final published versionae974a485f413a2113503eed53cd6c53
10.3847/1538-4365/ab7660