论文标题
CGM $^2 $调查：淬火和环境介质的转换
The CGM$^2$ Survey: Quenching and the Transformation of the Circumgalactic Medium
论文作者
论文摘要
这项研究介绍了银河系膜层培养基（CGM）中强OVI吸收剂的发病率如何取决于星系质量，并且独立于星系中的恒星形成量。我们使用类星体的HST/COS吸收光谱来测量400个投影KPC内的O VI吸收，而300 km S $^{ - 1} $ 52 $ M _ {*} \ SIM 10^{10} $ $ $ M_ \ M_ \ odot $ galaxies。星系的红移$ 0.12 <z <0.6 $，恒星质量$ 10^{10.1} <m_* <10^{10.9} $ $ $ m_ \ odot $，以及光谱分类为星形形成或被动。我们比较了高柱密度OVI吸收的发生率（$ n _ {\ rm o \，VI} \ geq 10^{14.3} $ cm $^{ - 2} $附近的星形和被动星系，在两个狭窄的恒星质量范围内，并在两个狭窄的恒星质量范围内，并分别在一个匹配的Halo Halo Halo Halo范围内。在所有三个质量范围内，覆盖150 kpc以内的O VI在星形星系周围的分数均高于被动星系周围，其统计显着性大于$3σ$的统计意义。平均而言，$ M _*\ sim 10^{10} $ $ M_ \ odot $星形星系的CGM包含的O VI比具有相同质量的被动星系的CGM更多。这种差异是CGM转化的证据，该转化与星系猝灭一起发生，并且不是主要由光晕质量驱动的。
This study addresses how the incidence rate of strong O VI absorbers in a galaxy's circumgalactic medium (CGM) depends on galaxy mass and, independently, on the amount of star formation in the galaxy. We use HST/COS absorption spectroscopy of quasars to measure O VI absorption within 400 projected kpc and 300 km s$^{-1}$ of 52 $M_{*}\sim 10^{10}$ $M_\odot$ galaxies. The galaxies have redshifts $0.12<z<0.6$, stellar masses $10^{10.1} < M_* < 10^{10.9}$ $M_\odot$, and spectroscopic classifications as star-forming or passive. We compare the incidence rates of high column density O VI absorption ($N_{\rm O\, VI} \geq 10^{14.3}$ cm$^{-2}$) near star-forming and passive galaxies in two narrow stellar mass ranges and, separately, in a matched halo mass range. In all three mass ranges, the O VI covering fraction within 150 kpc is higher around star-forming galaxies than around passive galaxies with greater than $3σ$-equivalent statistical significance. On average, the CGM of $M_*\sim 10^{10}$ $M_\odot$ star-forming galaxies contains more O VI than the CGM of passive galaxies with the same mass. This difference is evidence for a CGM transformation that happens together with galaxy quenching and is not driven primarily by halo mass.
