重元素在个别气晕外分布的可能环境效应
On the possible environmental effect in distributing heavy elements beyond individual gaseous halos
摘要：
我们提出了一个扩展的星系晕气体通过HI和OVI吸收超过二十年的$z\approx0.2$投影距离的研究。这项研究是基于一个样本的$95$星系从一个高度完整的（$ > 80\%$）调查微弱的星系（$L > 0.1L_*$）档案类星体的吸收光谱和$53$星系的文献。HI（OVI）柱密度和维里半径归一化投影距离$d/R_{\rm h}$之间存在明显的反相关性。强HI（OVI）吸收系统的柱密度大于$10^{14.0}$（$10^{13.5}$）cm $^{-2}$被发现的$54$星系的$48$（$36$ of $42$）在$d < \,R_{\rm h}$表明平均覆盖分数的$\langleκ_{\rm HI}\rangle=0.89$（$\langleκ_{\rm OVI}\rangle=0.86$）。在$d\approx R_{\rm h}$发现OVI吸收剂，超出了对较低电离物质观察到的程度。在$d/R_{\rm h}=1-3$，只有$43$的$7$（$34$的$5$）星系（$\langleκ_{\rm HI}\rangle=0.16$和$\langleκ_{\rm OVI}\rangle=0.15$）发现了强HI（OVI）吸收系统。超过$d=3\,R_{\rm h}$，HI和OVI覆盖分数降低至与巧合系统一致的水平。星系巡天的高度完整性使得能够对扩展气体性质的环境依赖性进行调查。与孤立星系（$κ_{\rm OVI}\approx0.13$与$0.04$）相比，与邻近星系的Galvanian在$d>R_{\rm h}$表现出OVI覆盖分数的适度增加，但没有多余的HI吸收。这些发现表明，环境效应在重元素分布方面发挥了作用，超出了个别星系的富集气体晕。最后，我们发现早型和晚型星系之间的HI和OVI吸收差异从$d < R_{\rm h}$持续到$d\approx3\,R_{\rm h}$。
英文摘要：
We present a study of extended galaxy halo gas through HI and OVI absorption over two decades in projected distance at $z\approx0.2$. The study is based on a sample of $95$ galaxies from a highly complete ($ > 80\%$) survey of faint galaxies ($L > 0.1L_*$) with archival quasar absorption spectra and $53$ galaxies from the literature. A clear anti-correlation is found between HI (OVI) column density and virial radius normalized projected distance, $d/R_{\rm h}$. Strong HI (OVI) absorption systems with column densities greater than $10^{14.0}$ ($10^{13.5}$) cm$^{-2}$ are found for $48$ of $54$ ($36$ of $42$) galaxies at $d < \,R_{\rm h}$ indicating a mean covering fraction of $\langleκ_{\rm HI}\rangle=0.89$ ($\langleκ_{\rm OVI}\rangle=0.86$). OVI absorbers are found at $d\approx R_{\rm h}$, beyond the extent observed for lower ionization species. At $d/R_{\rm h}=1-3$ strong HI (OVI) absorption systems are found for only $7$ of $43$ ($5$ of $34$) galaxies ($\langleκ_{\rm HI}\rangle=0.16$ and $\langleκ_{\rm OVI}\rangle=0.15$). Beyond $d=3\,R_{\rm h}$, the HI and OVI covering fractions decrease to levels consistent with coincidental systems. The high completeness of the galaxy survey enables an investigation of environmental dependence of extended gas properties. Galaxies with nearby neighbors exhibit a modest increase in OVI covering fraction at $d>R_{\rm h}$ compared to isolated galaxies ($κ_{\rm OVI}\approx0.13$ versus $0.04$) but no excess HI absorption. These findings suggest that environmental effects play a role in distributing heavy elements beyond the enriched gaseous halos of individual galaxies. Finally, we find that differential HI and OVI absorption between early- and late-type galaxies continues from $d < R_{\rm h}$ to $d\approx3\,R_{\rm h}$.
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