THE STRUCTURE OF THE CIRCUMGALACTIC MEDIUM OF GALAXIES: COOL ACCRETION INFLOW AROUND NGC 1097
THE STRUCTURE OF THE CIRCUMGALACTIC MEDIUM OF GALAXIES: COOL ACCRETION INFLOW AROUND NGC 1097
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星系环星系介质的结构：NGC 1097 周围的冷吸积流
DOI：
10.3847/0004-637x/826/1/50
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
B. Frye
中科院分区：
文献类型：
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作者：
D. Bowen;D. Chelouche;E. Jenkins;T. Tripp;M. Pettini;D. York;B. Frye
利用哈勃空间望远镜观测了四个类星体的远紫外光谱，它们的视线穿过NGC 1097的晕，碰撞参数为ρ = 48-165 kpc。NGC 1097是一个邻近的螺旋星系，至少经历了两次较小的合并事件，但没有明显的大合并，相对于邻近的其他明亮星系来说相对孤立。这使得NGC 1097成为一个很好的研究范例明亮星系晕中重子的案例。在沿着所有视线上都能检测到Lyα吸收，在具有最小ρ的三条视线上沿着发现Si iiiλ1206;仅在最内侧视线上确定发现C ii、Si ii和Si iv的金属线。的吸收线的运动学是最好的复制的一个模型与一个圆盘状的气体分布近似平面所观察到的21厘米H我盘，这是旋转速度比内盘慢，并进入其中的气体是从星系际介质的下落。朝向最内侧视线的部分吸收可能来自小规模的外流，或者来自与小合并相关的潮汐碎片，这导致了NGC 1097突出的众所周知的“狗腿”恒星流。与其他研究相比，NGC 1097似乎是一个“典型的”吸收体，尽管在单个晕中吸收线柱密度和等效宽度的大分散可能在某种程度上解释了在高z研究中看到的这些值的宽范围。
We present Hubble Space Telescope far-UV spectra of four QSOs whose sightlines pass through the halo of NGC 1097 at impact parameters of ρ = 48–165 kpc. NGC 1097 is a nearby spiral galaxy that has undergone at least two minor merger events, but no apparent major mergers, and is relatively isolated with respect to other nearby bright galaxies. This makes NGC 1097 a good case study for exploring baryons in a paradigmatic bright-galaxy halo. Lyα absorption is detected along all sightlines and Si iiiλ1206 is found along the three sightlines with the smallest ρ; metal lines of C ii, Si ii, and Si iv are only found with certainty toward the innermost sightline. The kinematics of the absorption lines are best replicated by a model with a disk-like distribution of gas approximately planar to the observed 21 cm H i disk, which is rotating more slowly than the inner disk, and into which gas is infalling from the intergalactic medium. Some part of the absorption toward the innermost sightline may arise either from a small-scale outflow or from tidal debris associated with the minor merger that gives rise to the well known “dog-leg” stellar stream that projects from NGC 1097. When compared to other studies, NGC 1097 appears to be a “typical” absorber, although the large dispersion in absorption line column density and equivalent width in a single halo goes perhaps some way toward explaining the wide range of these values seen in higher-z studies.
DOI：
10.1086/587486
发表时间：
2007-06
期刊：
The Astrophysical Journal Supplement Series
影响因子：
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作者：
T. Tripp;K. Sembach;D. Bowen;B. Savage;E. Jenkins;N. Lehner;P. Richter
通讯作者：
T. Tripp;K. Sembach;D. Bowen;B. Savage;E. Jenkins;N. Lehner;P. Richter
DOI：
10.1088/0004-637x/813/1/46
发表时间：
2015-04
期刊：
The Astrophysical Journal
影响因子：
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作者：
S. Borthakur;T. Heckman;J. Tumlinson;R. Bordoloi;C. Thom;B. Catinella;D. Schiminovich;R. Davé;G. Kauffmann;S. Moran;A. Saintonge
通讯作者：
S. Borthakur;T. Heckman;J. Tumlinson;R. Bordoloi;C. Thom;B. Catinella;D. Schiminovich;R. Davé;G. Kauffmann;S. Moran;A. Saintonge