论文标题
在$ z \ sim 0.12 $的Galaxy扩展光环中的太阳金属气体
Solar-Metallicity Gas in the Extended Halo of a Galaxy at $z \sim 0.12$
论文作者
论文摘要
我们使用来自$ HST $/cos和stis的光谱数据，对Blazar Sightline PG沿Blazar Sightline PG的检测和分析沿Blazar Sightline PG〜$ 1424+240 $，对$ z = 0.12122 $的检测和分析。吸收器是弱Mg II类似物，其发生率为弱C II和Si II，以及多组分C IV和O VI。低离子正在追踪密集（$ n_ {h} \ sim 10^{ - 3} $ cm $ $^{ - 3} $）parsec scale scale scale scale scale solar of太阳能或更高的金属性。运动学上的较高离子要么来自更漫射的（$ n_ {h} \ sim 10^{ - 5} -10^{ - 4} $ cm $ $^{ - 3} $）kiloparsec kiloparsec scale尺寸的光电离子阶段，要么是在温暖的（t $ \ sim 2 \ sim 2 \ tyse 10^colly layer）中，或者是在plentive clyemention。该吸收器居住在一个星系中泛质区域，预计半径为$ 5 $ MPC和$ 750 $ km s $^{ - 1} $，有18个发光（$> l^*$）星系。多相属性，高金属性和靠近$ 1.4 $ $ $ l^*$ galaxy，$ρ\ sim 200 $ kpc和$ |ΔV| = 11 $ km s $^{ - 1} $分离，有利于吸收追踪圆形气体的可能性。该吸收器是弱Mg II -O VI系统的一个例子，以研究外部星系中多相高速云的一种手段。
We present the detection and analysis of a weak low-ionization absorber at $z = 0.12122$ along the blazar sightline PG~$1424+240$, using spectroscopic data from both $HST$/COS and STIS. The absorber is a weak Mg II analogue, with incidence of weak C II and Si II, along with multi-component C IV and O VI. The low ions are tracing a dense ($n_{H} \sim 10^{-3}$ cm$^{-3}$) parsec scale cloud of solar or higher metallicity. The kinematically coincident higher ions are either from a more diffuse ($n_{H} \sim 10^{-5} - 10^{-4}$ cm$^{-3}$) photoionized phase of kiloparsec scale dimensions, or are tracing a warm (T $\sim 2 \times 10^{5}$ K) collisionally ionized transition temperature plasma layer. The absorber resides in a galaxy overdense region, with 18 luminous ($> L^*$) galaxies within a projected radius of $5$ Mpc and $750$ km s$^{-1}$ of the absorber. The multi-phase properties, high metallicity and proximity to a $1.4$ $L^*$ galaxy, at $ρ\sim 200$ kpc and $|Δv| = 11$ km s$^{-1}$ separation, favors the possibility of the absorption tracing circumgalactic gas. The absorber serves as an example of weak Mg II - O VI systems as a means to study multiphase high velocity clouds in external galaxies.
