THE RELATIONSHIP BETWEEN INTERGALACTIC H i/O vi AND NEARBY (z < 0.017) GALAXIES
THE RELATIONSHIP BETWEEN INTERGALACTIC H i/O vi AND NEARBY (z < 0.017) GALAXIES
复制标题
星系间 H i/O vi 与邻近 (z < 0.017) 星系之间的关系
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
B. Savage
中科院分区：
文献类型：
--
作者：
B. Wakker;B. Savage
利用哈勃空间望远镜和远紫外光谱探测器对76个活动星系核进行了v <5000 km s-1的星系际H i和O vi吸收体光谱分析。由H i/O vi吸收所追踪到的重子明显地与星系的扩展环境有关;当碰撞参数<400 kpc时，它们的数量是星系内部重子的2 - 4倍。这个巨大的物质库可能在星系演化中起着重要作用。我们将在给定的碰撞参数（ρ）和速度差（Δ v）范围内具有给定光度的吸收体的星系比例，以及具有比给定的ρ和Δ v更近的吸收体的星系比例制成表格。我们确定了可能的"空洞吸收体"（ρ> 3 Mpc到最近的L * 星系），尽管在v <2500 km s − 1时，所有的吸收体都在1.5 Mpc到L> 0.1 L * 星系的范围内。吸收体的性质依赖于ρ，但这种关系不是简单的相关。对于一个已知旋转方向的边缘星系的四个ρ = 50 - 350 kpc的吸收体，我们发现吸收体速度与其下星系的旋转曲线之间没有明确的关系。当ρ <350 kpc时，场星系和群星系的Ly α（Ovi）对L> 0.1 L * 星系的覆盖率分别为100%（70%）和65%（10%），50%的星系群有Ly α相伴。所有的O vi吸收体都出现在L> 0.25 L * 星系的550 kpc范围内。三个14 O VI吸收剂的性质是一致的光电离，五个证据点碰撞电离，其他的是模棱两可的。从z = 3到z = 0，Ly α宽谱线的比例随着撞击参数的减小而增加，这与星系中1500 kpc的气体正在升温的观点一致，尽管不能明确排除其他解释。
We analyze intergalactic H i and O vi absorbers with v < 5000 km s−1 in Hubble Space Telescope and Far Ultraviolet Spectroscopic Explorer spectra of 76 active galactic nuclei. The baryons traced by H i/O vi absorption are clearly associated with the extended surroundings of galaxies; for impact parameters <400 kpc they are 2–4 times more numerous as those inside the galaxies. This large reservoir of matter likely plays a major role in galaxy evolution. We tabulate the fraction of absorbers having a galaxy of a given luminosity within a given impact parameter (ρ) and velocity difference (Δv), as well as the fraction of galaxies with an absorber closer than a given ρ and Δv. We identify possible “void absorbers” (ρ > 3 Mpc to the nearest L* galaxy), although at v < 2500 km s−1 all absorbers are within 1.5 Mpc of an L>0.1 L* galaxy. The absorber properties depend on ρ, but the relations are not simple correlations. For four absorbers with ρ = 50–350 kpc from an edge-on galaxy with known orientation of its rotation, we find no clear relation between absorber velocities and the rotation curve of the underlying galaxy. For ρ < 350 kpc, the covering factor of Lyα (O vi) around L>0.1 L* galaxies is 100% (70%) for field galaxies and 65% (10%) for group galaxies; 50% of galaxy groups have associated Lyα. All O vi absorbers occur within 550 kpc of an L>0.25 L* galaxy. The properties of three of 14 O vi absorbers are consistent with photoionization, for five the evidence points to collisional ionization; the others are ambiguous. The fraction of broad Lyα lines increases from z = 3 to z = 0 and with decreasing impact parameter, consistent with the idea that gas inside ∼500 kpc from galaxies is heating up, although alternative explanations cannot be clearly excluded.
DOI：
10.1086/587486
发表时间：
2007-06
期刊：
The Astrophysical Journal Supplement Series
影响因子：
--
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：
10.1086/511749
发表时间：
2006-12
期刊：
The Astrophysical Journal
影响因子：
--
作者：
N. Lehner;B. Savage;P. Richter;K. Sembach;T. Tripp;B. P. W. U. O. N. Dame;U. Wisconsin;U. Bonn;Space Telescope Science Institute;U. O. Massachusetts
通讯作者：
N. Lehner;B. Savage;P. Richter;K. Sembach;T. Tripp;B. P. W. U. O. N. Dame;U. Wisconsin;U. Bonn;Space Telescope Science Institute;U. O. Massachusetts