MeerKAT HI对MHONGOOSE星系ESO 302- G014的试运行观测
MeerKAT HI commissioning observations of MHONGOOSE galaxy ESO 302-G014
摘要：
我们提出了三个委托HI观测与MeerKAT射电望远镜获得的结果。这些观测是即将进行的MHONGOOSE邻近星系巡天准备工作的一部分，该巡天是MeerKAT的一个大型巡天项目，将研究星系中气体的吸积以及气体与恒星形成之间的联系。我们使用现有的HI数据集，以及其他波长的辅助数据，研究MHONGOOSE样本星系ESO 302-G 014的形态，这是一个附近富含气体的矮星系。我们发现，ESO 302-G 014有一个不平衡的，不对称的外光盘与低柱密度。此外，我们还发现了HI云的尾部或细丝从星系延伸出去，以及一个孤立的HI云，距离星系南部约20 kpc。我们认为这些特征表明与低质量星系的轻微相互作用。光学成像显示在尾部附近可能有一个矮星系，但根据目前的数据，我们无法确认与ESO 302-G 014有任何关联。尽管如此，与某种低质量伴星的相互作用仍然得到了大量分子气体（几乎等于恒星质量）和一些突出的星团（这表明最近触发了恒星形成）的支持。这些数据表明，MeerKAT产生了精美的成像数据。因此，即将对ESO 302-G 014和其他样本星系进行的全深度巡天观测将提供对中性气体从星系间介质进入星系时的命运的深入了解。
英文摘要：
We present the results of three commissioning HI observations obtained with the MeerKAT radio telescope. These observations make up part of the preparation for the forthcoming MHONGOOSE nearby galaxy survey, which is a MeerKAT large survey project that will study the accretion of gas in galaxies and the link between gas and star formation. We used the available HI data sets, along with ancillary data at other wavelengths, to study the morphology of the MHONGOOSE sample galaxy, ESO 302-G014, which is a nearby gas-rich dwarf galaxy. We find that ESO 302-G014 has a lopsided, asymmetric outer disc with a low column density. In addition, we find a tail or filament of HI clouds extending away from the galaxy, as well as an isolated HI cloud some 20 kpc to the south of the galaxy. We suggest that these features indicate a minor interaction with a low-mass galaxy. Optical imaging shows a possible dwarf galaxy near the tail, but based on the current data, we cannot confirm any association with ESO 302-G014. Nonetheless, an interaction scenario with some kind of low-mass companion is still supported by the presence of a significant amount of molecular gas, which is almost equal to the stellar mass, and a number of prominent stellar clusters, which suggest recently triggered star formation. These data show that MeerKAT produces exquisite imaging data. The forthcoming full-depth survey observations of ESO 302-G014 and other sample galaxies will, therefore, offer insights into the fate of neutral gas as it moves from the intergalactic medium onto galaxies.
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