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arXiv 2404.01774astro-ph.GA
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MHONGOOSE -- 一个MeerKAT邻近星系HI巡天

MHONGOOSE -- A MeerKAT Nearby Galaxy HI Survey

W. J. G. de Blok, J. Healy, F. M. Maccagni, D. J. Pisano, A. Bosma, J. English, T. Jarrett, A. Marasco, G. R. Meurer, S. Veronese, F. Bigiel, L. Chemin, F. Frat… 展开作者

W. J. G. de Blok, J. Healy, F. M. Maccagni, D. J. Pisano, A. Bosma, J. English, T. Jarrett, A. Marasco, G. R. Meurer, S. Veronese, F. Bigiel, L. Chemin, F. Fraternali, B. W. Holwerda, P. Kamphuis, H. R. Klöckner, D. Kleiner, A. K. Leroy, M. Mogotsi, K. A. Oman, E. Schinnerer, L. Verdes-Montenegro, T. Westmeier, O. I. Wong, N. Zabel, P. Amram, C. Carignan, F. Combes, E. Brinks, R. J. Dettmar, B. K. Gibson, G. I. G. Jozsa, B. S. Koribalski, S. S. McGaugh, T. A. Oosterloo, K. Spekkens, A. C. Schröder, E. A. K. Adams, E. Athanassoula, M. A. Bershady, R. J. Beswick, S. Blyth, E. C. Elson, B. S. Frank, G. Heald, P. A. Henning, S. Kurapati, S. I. Loubser, D. Lucero, M. Meyer, B. Namumba, S. -H. Oh, A. Sardone, K. Sheth, M. W. L. Smith, A. Sorgho, F. Walter, T. Williams, P. A. Woudt, A. Zijlstra

AI总结:

该巡天利用MeerKAT观测30个邻近星系的HI气体,探测极低柱密度下的冷吸积气体,并发现伴星系数量与主星系质量相关。

摘要:

MHONGOOSE(MeerKAT HI Observations of Nearby Galactic Objects: Observing Southern Emitters)巡天测绘了30个邻近恒星形成旋涡星系和矮星系内部及周围的中性原子氢(HI)气体的分布和运动学,直至极低的HI柱密度。HI柱密度灵敏度(3σ,16 km/s)范围从90角秒分辨率下的约5×10^{17} cm^{-2}到7角秒最高分辨率下的约4×10^{19} cm^{-2}。HI质量灵敏度(3σ,50 km/s)在10 Mpc距离(样本星系的中位距离)下约为5.5×10^5 M_sun。数据的速度分辨率为1.4 km/s。巡天的主要科学目标之一是探测样本星系外围的冷吸积气体。样本的选择覆盖了从10^7 M_sun到接近10^{11} M_sun的HI质量范围,以最优地采样可能的吸积情景和环境。样本星系的距离范围从3到23 Mpc。在本文中,我们介绍了样本选择、巡天设计以及观测和数据处理流程。我们将基于MeerKAT数据的积分HI通量与单碟测量得到的通量进行比较,发现两者吻合良好,表明我们的MeerKAT观测恢复了所有通量。我们基于巡天数据的前百分之十展示了整个样本的HI矩图,发现零阶矩和一阶矩值的比较显示了恒星形成区域和非恒星形成区域中HI物理性质的明显分离,这与冷中性介质的形成有关。最后,我们概述了30个场中HI探测到的伴星系和卫星星系,其中五个此前未被编目。我们发现伴星系数量与主目标星系质量之间存在明确的关系。

英文摘要:

The MHONGOOSE (MeerKAT HI Observations of Nearby Galactic Objects: Observing Southern Emitters) survey maps the distribution and kinematics of the neutral atomic hydrogen (HI) gas in and around 30 nearby star-forming spiral and dwarf galaxies to extremely low HI column densities. The HI column density sensitivity (3 sigma over 16 km/s) ranges from ~ 5 x 10^{17} cm^{-2} at 90'' resolution to ~4 x 10^{19} cm^{-2} at the highest resolution of 7''. The HI mass sensitivity (3 sigma over 50 km/s) is ~5.5 X 10^5 M_sun at a distance of 10 Mpc (the median distance of the sample galaxies). The velocity resolution of the data is 1.4 km/s. One of the main science goals of the survey is the detection of cold, accreting gas in the outskirts of the sample galaxies. The sample was selected to cover a range in HI masses, from 10^7 M_sun to almost 10^{11} M_sun, to optimally sample possible accretion scenarios and environments. The distance to the sample galaxies ranges from 3 to 23 Mpc. In this paper, we present the sample selection, survey design, and observation and reduction procedures. We compare the integrated HI fluxes based on the MeerKAT data with those derived from single-dish measurement and find good agreement, indicating that our MeerKAT observations are recovering all flux. We present HI moment maps of the entire sample based on the first ten percent of the survey data, and find that a comparison of the zeroth- and second-moment values shows a clear separation between the physical properties of the HI in areas with star formation and areas without, related to the formation of a cold neutral medium. Finally, we give an overview of the HI-detected companion and satellite galaxies in the 30 fields, five of which have not previously been catalogued. We find a clear relation between the number of companion galaxies and the mass of the main target galaxy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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