Sloan数字巡天第七次数据发布中类星体的CIV Baldwin效应
The CIV Baldwin effect in QSOs from Seventh Data Release of the Sloan Digital Sky Survey
摘要：
利用Shen等人的SDSS DR 7类星体目录的性质，利用可靠的谱分析方法，研究了35019个类星体大样本的Baldwin效应及其斜率演化和潜在驱动力。我们发现在这个大的类星体样本中存在Baldwin效应，在11个不同的红移仓中，直到$z\sim 5$，Baldwin效应几乎是相同的。BCES的斜率为-0.238（\civ \ EW取决于连续体），BCES平分线的斜率为-0.787。对于11个红移面元，Baldwin效应斜率从$z\sim1.5$增加到$z\sim2.0$。从$z\sim2.0$到$z\sim5.0$，考虑到它们的不确定性或更大的红移仓，斜率的变化并不明显。在静止帧\civ \ EW和基于\civ的\mbh之间存在强相关性，而在\civ \ EW和基于\mgii的\mbh之间的关系非常弱。通过从\civ相对于\mgii的蓝移中校正基于\civ的\mbh，我们认为这种强相关性是由于基于\civ的\mbh相对于来自\mgii的\mbh的偏倚。考虑到基于\mgii的\mbh，在\civ \ EW和爱丁顿比之间发现了中等强度的相关性，这意味着爱丁顿比似乎是比中心黑洞质量更好的基本物理参数。
英文摘要：
Using the properties of SDSS DR7 QSOs catalog from Shen et al., the Baldwin effect, its slope evolution, the underlying drive for a large sample of 35019 QSOs with reliable spectral analysis are investigated. We find that the Baldwin effect exists in this large QSOs sample, which is almost the same in 11 different redshift bins, up to $z\sim 5$. The slope is -0.238 by the BCES (\civ\ EW depends on the continuum), -0.787 by the BCES bisector. For 11 redshift-bins, there is an increasing of the Baldwin effect slope from $z\sim1.5$ to $z\sim2.0$. From $z\sim2.0$ to $z\sim5.0$, the slope change is not clear considering their uncertainties or larger redshift bins. There is a strong correlation between the rest-frame \civ\ EW and \civ-based \mbh while the relation between the \civ\ EW and \mgii-based \mbh is very weak. With the correction of \civ-based \mbh from the \civ\ blueshift relative to \mgii, we suggest that this strong correlation is due to the bias of the \civ-based \mbh, with respect to that from the \mgii\ line. Considering the \mgii-based \mbh, a medium strong correlation is found between the \civ\ EW and the Eddington ratio, which implies that the Eddington ratio seems to be a better underlying physical parameter than the central black hole mass.
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