论文标题
S-Plus中的一百个污迹：超湿星系在现场繁荣
One hundred SMUDGes in S-PLUS: ultra-diffuse galaxies flourish in the field
论文作者
论文摘要
我们介绍了在现场的超湿星系（UDG）恒星种群的首次系统研究，通过Smudges调查与S-Plus调查的十二波段光学光度法进行了大面积搜索和UDG的表征。基于UDGS光学颜色的贝叶斯建模，我们确定了分布在$ \ sim 330 $ deg $^2 $的区域的年龄，金属性和恒星质量，在82区域中。我们发现，UDG的恒星质量和金属性与群集中观察到的质量相似，并遵循矮和巨型星系研究中先前定义的趋势。但是，与群集中的UDG相比，场UDG具有年轻的光度加权年龄。我们将此结果解释为意味着场udgs具有更多扩展的恒星形成历史，其中包括一些继续以低水平形成恒星到当前的时间。最后，我们研究了出色的种群扩展关系，表明UDG作为人群类似于其他低表面亮度星系。
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 $\sim 330$ 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.
