H i properties of satellite galaxies around local volume hosts
H i properties of satellite galaxies around local volume hosts
复制标题
本地体积宿主周围卫星星系的 H 属性
DOI：
10.1093/mnras/stac2329
复制
发表时间：
2022
影响因子：
4.8
通讯作者：
Mutlu-Pakdıl, Burçın
中科院分区：
文献类型：
--
作者：
Karunakaran, Ananthan;Spekkens, Kristine;Carroll, Rhys;Sand, David J.;Bennet, Paul;Crnojević, Denija;Jones, Michael G.;Mutlu-Pakdıl, Burçın
我们利用Robert C. Byrd Green Bank望远镜，沿着8个本体积系统（M104、M51、NGC 1023、NGC 1156、NGC 2903、NGC 4258、NGC 4565和NGC 4631）周围49个已确认或可能存在的矮卫星星系的视线，对中性原子氢（Hi）进行了观测。我们检测了两个候选者（dw0934+2204和dw1238−1122）的hi库，发现它们是相对于最近的前景宿主系统的背景源。其余47颗候选卫星在Hi中没有被探测到，我们对它们的Himass设置了严格的5σ上限。我们注意到，我们的一些（15/47）未探测到是由于卫星被假定的宿主的辐射遮挡。除了这些新的观测结果，我们还汇编了Himass上另外17颗卫星的文献估计。我们将这些卫星的Hiproperties与Local Group内的卫星进行比较，发现它们之间存在广泛的一致性。至关重要的是，这些观测探测了−10±MV±14之间的“过渡”区域，在那里我们看到了富含气体和缺乏气体的卫星的混合物。虽然该区域内有许多贫气卫星，但也有一些富气卫星，这表明向主要富气卫星的转变发生在atLV ~ 107L⊙，这与模拟结果一致。这里提出的观测是表征局域体系统周围矮卫星星系特性的关键一步，未来具有更高角分辨率的广域无线电调查（例如WALLABY）将极大地改进对此类系统的研究。
We present neutral atomic hydrogen (Hi) observations using the Robert C. Byrd Green Bank Telescope along the lines of sight to 49 confirmed or possible dwarf satellite galaxies around eight Local Volume systems (M104, M51, NGC 1023, NGC 1156, NGC 2903, NGC 4258, NGC 4565, and NGC 4631). We detect the Hireservoirs of two candidates (dw0934+2204 and dw1238−1122) and find them to be background sources relative to their nearest foreground host systems. The remaining 47 satellite candidates are not detected in Hi, and we place stringent 5σupper limits on their Himass. We note that some (15/47) of our non-detections stem from satellites being occluded by their putative host’s Hiemission. In addition to these new observations, we compile literature estimates on the Himass for an additional 17 satellites. We compare the Hiproperties of these satellites to those within the Local Group, finding broad agreement between them. Crucially, these observations probe a ‘transition’ region between −10 ≳MV≳ −14 where we see a mixture of gas-rich and gas-poor satellites. While there are many gas-poor satellites within this region, some are gas-rich and this suggests that the transition towards predominantly gas-rich satellites occurs atLV∼ 107L⊙, in line with simulations. The observations presented here are a key step toward characterizing the properties of dwarf satellite galaxies around Local Volume systems and future wide-field radio surveys with higher angular resolution (e.g. WALLABY) will vastly improve upon the study of such systems.