A search for satellite galaxies of nearby star-forming galaxies with resolved stars in LBT-SONG
A search for satellite galaxies of nearby star-forming galaxies with resolved stars in LBT-SONG
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DOI：
10.1093/mnras/stab2447
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发表时间：
2021-05
影响因子：
4.8
通讯作者：
C. Garling;A. Peter;C. Kochanek;D. Sand;D. Crnojevi'c
中科院分区：
文献类型：
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作者：
C. Garling;A. Peter;C. Kochanek;D. Sand;D. Crnojevi'c
我们展示了使用大型双目望远镜的深部（m ∼ 27 mag）光学成像对六个附近（D < 5 Mpc）亚银河系质量宿主的矮卫星星系进行解析恒星族搜索的结果。我们进行图像模拟，以量化在大范围的光度和尺寸上对矮星的检测效率，并开发一个基于目录的快速模拟器，其中包括对未解决的光度混合的处理。我们没有发现新的矮卫星，但我们发现了两颗先前已知的矮卫星（DDO 113 和 LV J1228+4358），它们的 MV < -12 位于我们的勘测体积中。我们预览了一种新的理论框架，使用解析概率分布函数来预测卫星光度函数，并将其应用于我们的样本，发现我们预测的经典矮星和暗矮星（MV ∼ -7.5）比我们在观测样本中发现的少一颗（即观测样本稍微头重脚轻）。然而，观测样本（2）中矮星的总数与理论预期非常吻合。有趣的是，DDO 113 显示出环境猝灭的迹象，而 LV J1228+4358 正在潮汐扰乱，这表明低质量宿主对卫星的影响可能比之前认为的更严重。
We present results from a resolved stellar population search for dwarf satellite galaxies of six nearby (D < 5 Mpc), sub-Milky Way mass hosts using deep (m ∼ 27 mag) optical imaging from the Large Binocular Telescope. We perform image simulations to quantify our detection efficiency for dwarfs over a large range in luminosity and size, and develop a fast catalogue-based emulator that includes a treatment of unresolved photometric blending. We discover no new dwarf satellites, but we recover two previously known dwarfs (DDO 113 and LV J1228+4358) with MV < −12 that lie in our survey volume. We preview a new theoretical framework to predict satellite luminosity functions using analytical probability distribution functions and apply it to our sample, finding that we predict one fewer classical dwarf and one more faint dwarf (MV ∼ −7.5) than we find in our observational sample (i.e. the observational sample is slightly top-heavy). However, the overall number of dwarfs in the observational sample (2) is in good agreement with the theoretical expectations. Interestingly, DDO 113 shows signs of environmental quenching and LV J1228+4358 is tidally disrupting, suggesting that low-mass hosts may affect their satellites more severely than previously believed.