A DETECTION OF GAS ASSOCIATED WITH THE M31 STELLAR STREAM

A DETECTION OF GAS ASSOCIATED WITH THE M31 STELLAR STREAM
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与 M31 恒星流相关的气体的检测

DOI:
10.1088/0004-637x/807/2/153
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发表时间:
2015
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Keeney
Keeney
中科院分区:
--
文献类型:
--
作者:
Danforth;Keeney

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对银河系和仙女座(M31)星系晕中恒星种群的详细研究表明,潮汐流和矮星系的数量正在增加,证明了一个复杂而持续的等级结构形成过程。M31晕中最显著的特征是巨大的星流,这是一个沿天空沿着14 fdg 5的结构,它靠近星系的短轴,但与短轴不重合。组成这条恒星流的恒星在运动学和化学上都与晕中的其他恒星不同。在这里,我们提出了哈勃太空望远镜/宇宙起源摄谱仪高分辨率紫外吸收光谱的三个活动星系核视线探测M31晕,包括一个采样气体的主要西南部分的巨星流。我们看到两个明确的吸收组件在许多金属物种的速度典型的M31晕和第三个,蓝移的组成部分,出现在流。不同组成部分的柱密度比的光电离模型显示了在其他星系晕环境中所见的典型电离状态的气体,并表明太阳能稍微超太阳的金属丰度,与以前的恒星光谱学研究结果一致。
Detailed studies of stellar populations in the halos of the Milky Way and the Andromeda (M31) galaxies have shown increasing numbers of tidal streams and dwarf galaxies, attesting to a complicated and on-going process of hierarchical structure formation. The most prominent feature in the halo of M31 is the Giant Stellar Stream, a structure∼ 4 fdg 5 in extent along the sky, which is close to, but not coincident with the galaxy's minor axis. The stars that make up this stream are kinematically and chemically distinct from the other stars in the halo. Here, we present Hubble Space Telescope/Cosmic Origins Spectrograph high-resolution ultraviolet absorption spectra of three active galactic nuclei sight lines which probe the M31 halo, including one that samples gas in the main southwestern portion of the Giant Stream. We see two clear absorption components in many metal species at velocities typical of the M31 halo and a third, blueshifted component which arises in the stream. Photoionization modeling of the column density ratios in the different components shows gas in an ionization state typical of that seen in other galaxy halo environments and suggests solar to slightly super-solar metallicity, consistent with previous findings from stellar spectroscopy.
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