One Hundred SMUDGes in S-PLUS: Ultra-diffuse Galaxies Flourish in the Field

被引：41

作者：

Barbosa, C. E. ^{[1
,2
]}

Zaritsky, D. ^{[1
]}

Donnerstein, R. ^{[1
]}

Zhang, H. ^{[1
]}

Dey, A. ^{[3
]}

de Oliveira, C. Mendes ^{[2
]}

Sampedro, L. ^{[2
]}

Molino, A. ^{[2
]}

Costa-Duarte, M. V. ^{[2
]}

Coelho, P. ^{[2
]}

Cortesi, A. ^{[2
]}

Herpich, F. R. ^{[2
]}

Hernandez-Jimenez, J. A. ^{[2
,4
]}

Santos-Silva, T. ^{[2
]}

Pereira, E. ^{[2
]}

Werle, A. ^{[2
,5
]}

Overzier, R. A. ^{[2
,6
]}

Fernandes, R. ^{[5
]}

Castelli, A. V. Smith ^{[7
,8
]}

Ribeiro, T. ^{[3
,9
]}

Schoenell, W. ^{[10
,11
]}

Kanaan, A. ^{[5
]}

机构：

[1] Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85719 USA

[2] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Astron, Rua Matao 1225, BR-05508090 Sao Paulo, SP, Brazil

[3] NSF, Natl Opt Infrared Astron Res Lab, POB 26732, Tucson, AZ 85726 USA

[4] Univ Andres Bello, Dept Ciencias Fis, Fernandez Concha 700, Santiago, Chile

[5] Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil

[6] Minist Ciencia Tecnol Inovacao & Comunicacoes, Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil

[7] UNLP, Inst Astrofis La Plata, CONICET, Paseo Bosque S-N,B1900FWA, La Plata, Argentina

[8] UNLP, Fac Ciencias Astron & Geofis, Paseo Bosque S-N,B1900FWA, La Plata, Argentina

[9] Univ Fed Sergipe, Dept Fis, Ave Marechal Rondon S-N, BR-49000000 Sao Cristovao, SE, Brazil

[10] GMTO Corp, 465 N Halstead St,Suite 250, Pasadena, CA 91107 USA

[11] Univ Fed Rio Grande do Sul, Inst Fis, Dept Astron, Ave Bento Goncalves 9500, Porto Alegre, RS, Brazil

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2020年 / 247卷 / 02期

基金：

巴西圣保罗研究基金会;

关键词：

Low surface brightness galaxies; Stellar populations; Stellar ages; Metallicity; Stellar masses; SURFACE BRIGHTNESS GALAXIES; STELLAR POPULATION-MODELS; ULTRADIFFUSE GALAXIES; INTERSTELLAR EXTINCTION; II; CONSTRAINTS; VIRGO CLUSTER; DARK-MATTER; ORIGIN; MILES; MASS;

D O I：

10.3847/1538-4365/ab7660

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：14

共 113 条

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