MeerKAT HI commissioning observations of MHONGOOSE galaxy ESO 302-G014-猫眼课题宝

DOI：

10.1051/0004-6361/202038894

发表时间：

2020-09

期刊：

Astronomy & Astrophysics

影响因子：

6.5

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

W. D. Blok;E. Athanassoula;A. Bosma;Francoise Combes;J. English;G. Heald;P. Kamphuis;B. Koribalski;G. Meurer;J. Rom'an;A. Sardone;L. Verdes-Montenegro;F. Bigiel;E. Brinks;L. Chemin;F. Fraternali;T. Jarrett;D. Kleiner;F. Maccagni;D. Pisano;Paolo Serra;K. Spekkens;P. Amram;C. Carignan;R. Dettmar;B. K. Gibson;B. Holwerda;G. Józsa;D. Lucero;T. Oosterloo;A. Ramaila;M. Ramatsoku;K. Sheth;Fabian Walter;O. I. Wong;A. Zijlstra;S. Bloemen;P. J. Groot;R. Poole;M. Klein-Wolt;E. Körding;Vanessa McBride;K. Paterson;D. Pieterse;P. Vreeswijk;P. Woudt

目标。我们提出了三个委托H我的观测结果与MeerKAT射电望远镜。这些观测是即将进行的MHONGOOSE附近星系调查准备工作的一部分，该调查是MeerKAT的一个大型调查项目，将研究星系中气体的吸积以及气体与星星形成之间的联系。方法.我们使用现有的H I数据集，沿着辅助数据在其他波长，研究的MHONGOOSE样本星系，ESO 302-G 014，这是一个附近的富含气体的矮星系的形态。结果我们发现，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，我们还发现了一个远离星系的H I云的尾巴或细丝，以及一个孤立的H I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）和一些突出的恒星团的支持，这表明最近触发了星星的形成。结论.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。

Aims. We present the results of three commissioning H I 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. Methods. We used the available H I 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. Results. 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 H I clouds extending away from the galaxy, as well as an isolated H I 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. Conclusions. 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.

MeerKAT HI commissioning observations of MHONGOOSE galaxy ESO 302-G014

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