论文标题
将超湿的星系丰度扩展到银河系类似物
Extending Ultra-Diffuse Galaxy Abundances to Milky Way Analogs
论文作者
论文摘要
我们扩展了Ultra-diffuse Galaxy（UDG）丰度关系，$ n_ {udg} -m_ {200} $，以降低Halo Mass hosts $（M_ {200} \ SIM10^{11.6-12.2} M _ {\ odot}）$。我们从银河系类似物周围已发表的矮卫星星系目录中选择了UDG卫星，即对本地体积卫星（精灵）调查的探索，银河类似物（Saga）调查周围的卫星调查以及对使用超弹药摄像机进行类似乳白色的系统的调查。在总共75个类似银河系的宿主的516颗卫星中，我们发现41颗卫星约33个主机满足UDG标准。主机光环质量的分布在$ m_ {200} \ sim10^{12} m _ {\ odot} $左右，独立于主机是否具有UDG卫星。我们使用文献UDG丰度，并在此衍生的文献来追踪$ n_ {udg} -m_ {200} $之间的关系，以下三个数量级至$ m_ {200} = 10^{11.6} m _ {\ odot} $，并找到$ N_ {udg n _ _ {udg {udg} = udg} = （38 \ pm5）\ cdot（\ frac {m_ {200}}} {10^{14}}）^{0.89 \ pm0.04} $。该子线性斜率与早期对UDG丰度的研究以及更明亮的矮星系的丰度关系一致，不包括需要高密度环境的UDG形成机制。但是，我们强调需要在各种环境中对UDG进行进一步的均匀表征，以正确理解$ n_ {udg} -m_ {200} $关系。
We extend the Ultra-Diffuse Galaxy (UDG) abundance relation, $N_{UDG}-M_{200}$, to lower halo mass hosts $(M_{200}\sim10^{11.6-12.2}M_{\odot})$. We select UDG satellites from published catalogs of dwarf satellite galaxies around Milky Way analogs, namely the Exploration of Local Volume Satellites (ELVES) survey, Satellite Around Galactic Analogs (SAGA) survey, and a survey of Milky Way-like systems conducted using the Hyper-Suprime Cam. Of the 516 satellites around a total of 75 Milky Way-like hosts, we find 41 satellites around 33 hosts satisfy the UDG criteria. The distributions of host halo masses peak around $M_{200}\sim10^{12}M_{\odot}$ independent of whether the host has a UDG satellite or not. We use literature UDG abundances and those derived here to trace the $N_{UDG}-M_{200}$ relation over three orders of magnitude down to $M_{200}=10^{11.6}M_{\odot}$ and find a best-fit linear relation of $N_{UDG} = (38\pm5)\cdot(\frac{M_{200}}{10^{14}})^{0.89\pm0.04}$. This sub-linear slope is consistent with earlier studies of UDG abundances as well as abundance relations for brighter dwarf galaxies, excluding UDG formation mechanisms that require high-density environments. However, we highlight the need for further homogeneous characterization of UDGs across a wide range of environments to properly understand the $N_{UDG}-M_{200}$ relation.
