论文标题
大型早期型星系的各向异性环境培养基
The Anisotropic Circumgalactic Medium of Massive Early-Type Galaxies
论文作者
论文摘要
Using measurements of the [O III], H$α$ and [N II] emission line fluxes originating in the cool (T $\sim10^4$ K) gas that populates the halos of massive early-type galaxies with stellar mass greater than $10^{10.4}$ M$_\odot$, we explore the recent conjecture that active galactic nucleus (AGN) activity preferentially removes沿极（次要轴）方向的环境培养基（CGM）。我们发现[O III]的平均发射线通量和H $α$（分别为65％和43％）的平均发射线通量不足，尽管由于这些困难测量的较大不确定性，但结果具有边际统计学意义（1.5 $σ$）。诊断比率更强（根据统计测试的置信度为97％至99.9％），诊断线比在小半径处沿极性方向上的Agn离子化特征更强，而不是其他角度或半径。我们的结果与大规模的早期类型星系中各向异性CGM的猜想是一致的，该星系是基于独立的理由，与AGN活性相关，并开始使用发射线显示CGM映射的潜力。
Using measurements of the [O III], H$α$ and [N II] emission line fluxes originating in the cool (T $\sim10^4$ K) gas that populates the halos of massive early-type galaxies with stellar mass greater than $10^{10.4}$ M$_\odot$, we explore the recent conjecture that active galactic nucleus (AGN) activity preferentially removes the circumgalactic medium (CGM) along the polar (minor-axis) direction. We find deficits in the mean emission line flux of [O III] and H$α$ (65 and 43%, respectively) along the polar vs. planar directions, although due to the large uncertainties in these difficult measurements the results are of marginal statistical significance (1.5$σ$). More robustly (97 to 99.9% confidence depending on the statistical test), diagnostic line ratios show stronger AGN ionization signatures along the polar direction at small radii than at other angles or radii. Our results are consistent with the conjecture of an anisotropic CGM in massive, early type galaxies, suggested on independent grounds, that is tied to AGN activity and begin to show the potential of CGM mapping using emission lines.
