COS-Dwarfs巡天：次L * 星系周围的碳储层
The COS-Dwarfs Survey: The Carbon Reservoir Around sub-L* Galaxies
摘要：
我们报告了新的观测环星系气体的COS矮调查，系统的调查周围的43个低质量z $\leq$ 0.1星系使用背景类星体观测宇宙起源光谱仪。从CIV吸收的一维和二维投影分布中，我们发现在宿主星系的~ 0.5 R $_{vir}$处都能检测到CIV吸收。C IV吸收强度呈幂律径向下降，超过0.5 R $_{vir}$时，未检测到C IV吸收超过我们的灵敏度限值~ 50-100 m $Å$。我们发现探测到的CIV吸收强度与恒星形成之间存在一种初步的相关性，与COS-Halos巡天在L~L* 星系的高电离氧中发现的强相关性相平行。这些数据意味着在这些星系的CGM中有一个大的碳库，对应的最小碳质量为$\gtrsim$ 1.2 $\times 10^6$ $M_\odot$，约为110 kpc。这个质量与ISM中的碳质量相当，并且超过了这些星系恒星中的碳质量。在这些亚L * 星系周围观察到的C IV吸收几乎可以解释在低z下检测到的所有$W_r$ > 100 m $Å$ C IV吸收的三分之二。比较CIV覆盖分数与流体动力学模拟，我们发现，能量驱动的风模型是一致的观测，而恒定速度的风模型未能再现CGM或星系的属性。
英文摘要：
We report new observations of circumgalactic gas from the COS-Dwarfs survey, a systematic investigation of the gaseous halos around 43 low-mass z $\leq$ 0.1 galaxies using background QSOs observed with the Cosmic Origins Spectrograph. From the projected 1D and 2D distribution of C IV absorption, we find that C IV absorption is detected out to ~ 0.5 R$_{vir}$ of the host galaxies. The C IV absorption strength falls off radially as a power law and beyond 0.5 R$_{vir}$, no C IV absorption is detected above our sensitivity limit of ~ 50-100 m$Å$. We find a tentative correlation between detected C IV absorption strength and star formation, paralleling the strong correlation seen in highly ionized oxygen for L~L* galaxies by the COS-Halos survey. The data imply a large carbon reservoir in the CGM of these galaxies, corresponding to a minimum carbon mass of $\gtrsim$ 1.2$\times 10^6$ $M_\odot$ out to ~ 110 kpc. This mass is comparable to the carbon mass in the ISM and more than the carbon mass currently in stars of these galaxies. The C IV absorption seen around these sub-L* galaxies can account for almost two-thirds of all $W_r$> 100 m$Å$ C IV absorption detected at low z. Comparing the C IV covering fraction with hydrodynamical simulations, we find that an energy-driven wind model is consistent with the observations whereas a wind model of constant velocity fails to reproduce the CGM or the galaxy properties.
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