A survey of HI gas toward the Andromeda Galaxy

A survey of HI gas toward the Andromeda Galaxy
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对仙女座星系的 HI 气体的调查

DOI:
10.1051/0004-6361/201526395
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发表时间:
2016
期刊:
arXiv: Astrophysics of Galaxies
影响因子:
--
通讯作者:
Winkel B.
Winkel B.
中科院分区:
--
文献类型:
--
作者:
Kerp J;Kalberla P.M.W;Ben Bekhti N;Flöer L;Winkel B.

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宇宙时间中低质量晕随后的聚合被认为是像银河系和仙女座星系这样的大质量螺旋星系的主要形成通道(M 31)。大质量星系的气态晕被认为是重子物质的储存库,持续地为盘中恒星的形成提供燃料。M 31是非常详细地研究晕气体结构的理想对象。目的利用埃菲尔斯堡-波恩中性原子氢调查的最新中性原子氢(HI)数据,可以包括与M 31相关的气体的全面清单。主要目的是区分属于银河系和M 31的物理结构,并据此测试M 31中性气晕的存在。方法分析空间全采样的EBHIS数据,使追踪空间和径向速度的相干HI结构成为可能。为了解开银河系和M 31 HI辐射的纠缠,我们使用了一种新的方法,以及传统的设置径向速度上限的方法,通过计算差分二阶矩图。结果我们认为M 31‘S盘物理上连接到了一个大小为数十kpc的不对称HI晕,即M 31 云。我们确认了位于M 31和M 33之间的相干低速HI暗条的存在,该暗条与云以系统速度对齐。在系统速度下,HI暗条的物理参数与HI云的物理参数相当。我们还探测到了一个形状不规则的HI云,它的位置接近但偏离了和 XIX的星体。
ContextThe subsequent coalescence of low-mass halos over cosmic time is thought to be the major formation channel of massive spiral galaxies like the Milky Way and the Andromeda galaxy (M 31). The gaseous halo of a massive galaxy is considered to be the reservoir of baryonic matter persistently fueling the star formation in the disk. Because of its proximity, M 31 is the ideal object for studying the structure of the halo gas in great detail.AimsUsing the latest neutral atomic hydrogen (HI) data of the Effelsberg-Bonn HI Survey (EBHIS) allows comprising a comprehensive inventory of gas associated with M 31. The primary aim is to differentiate between physical structures belonging to the Milky Way Galaxy and M 31 and accordingly to test the presence of a M 31 neutral gaseous halo.MethodsAnalyzing the spatially fully sampled EBHIS data makes it feasible to trace coherent HI structures in space and radial velocity. To disentangle Milky Way and M 31 HI emission we use a new approach, along with the traditional path of setting an upper radial velocity limit, by calculating a difference second moment map.ResultsWe argue that M 31’s disk is physically connected to an asymmetric HI halo of tens of kpc size, the M 31 cloud. We confirm the presence of a coherent low-velocity HI filament located in between M 31 and M 33 aligned at the sky with the clouds at systemic velocity. The physical parameters of the HI filament are comparable to those of the HI clouds at systemic velocity. We also detected an irregularly shaped HI cloud that is is positionally located close to but offset from the stellar body of And XIX.
仙女座星系周围存在巨大、延伸的环绕星系介质的证据
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