论文标题
缪斯气流和风（巨型）vi。对围绕[OII]发射星系吸收气体的CIV和MGII的研究
MusE GAs Flow and Wind (MEGAFLOW) VI. A study of CIV and MgII absorbing gas surrounding [OII] emitting galaxies
论文作者
论文摘要
使用Megaflow调查，包括缪斯和尺寸的观察结果，对被选中包含强大MGII吸收器的22个类星体田的观察结果组成，我们使用新颖的贝叶斯逻辑回归方法覆盖了CIV和MGII的分数$ b $，以适用于小样本。我们还分析了CIV和MGII如何通过红移覆盖分数。在缪斯数据中，我们发现215 $ z = 1-1.5 $ [oii]磁通量$> 10^{ - 17} $ erg \ \，s $^{ - 1} $ \，cm $^{ - 2} $，在250 kpc of quasar oike-lines。在此红移路径上，$ z = 1-1.5 $，我们有19（32）个CIV（MGII）吸收系统，具有静止框架等效宽度（REW）$ W_R> $0.05Å$0.05Å与至少一个[OII]发射极相关。 $ z \ of1.2 $ civ（mgii）的覆盖分数，平均$ w_r \ $0.7Å（1.0Å），超过23 $^{+62} _ { - 16} $（46 $^{+18} _ {+18} _ { - 13} $）。与已发表的研究一起，我们的结果表明，随着时间的流逝，CIV（MGII）的覆盖部分（MGII）变大（较小）。对于具有CIV但没有MGII的吸收系统，我们在73％的情况下发现没有[OII]对应物。这可能表明CIV来自星际培养基（IGM），即超过250 kpc，或者与下质量或静态星系有关。
Using the MEGAFLOW survey, which consists of a combination of MUSE and UVES observations of 22 quasar fields selected to contain strong MgII absorbers, we measure covering fractions of CIV and MgII as a function of impact parameter $b$ using a novel Bayesian logistic regression method on unbinned data, appropriate for small samples. We also analyse how the CIV and MgII covering fractions evolve with redshift. In the MUSE data, we found 215 $z=1-1.5$ [OII] emitters with fluxes $>10^{-17}$ erg\,s$^{-1}$\,cm$^{-2}$ and within 250 kpc of quasar sight-lines. Over this redshift path $z=1-1.5$, we have 19 (32) CIV (MgII) absorption systems with rest-frame equivalent width (REW) $W_r>$0.05Å associated with at least one [OII] emitter. The covering fractions of $z\approx1.2$ CIV (MgII) absorbers with mean $W_r\approx$0.7Å (1.0Å), exceeds 50\% within 23$^{+62}_{-16}$ (46$^{+18}_{-13}$) kpc. Together with published studies, our results suggest that the covering fraction of CIV (MgII) becomes larger (smaller) with time, respectively. For absorption systems that have CIV but not MgII, we find in 73\% of the cases no [OII] counterpart. This may indicate that the CIV comes from the intergalactic medium (IGM), i.e. beyond 250 kpc, or that it is associated with lower-mass or quiescent galaxies.
