论文标题
SDSS Stripe 82 II中的低红移类星体：相关的同伴星系和恒星形成的签名
Low-redshift quasars in the SDSS Stripe 82 II: associated companion galaxies and signature of star formation
论文作者
论文摘要
我们介绍了22个低红移（z <0.5）类星体（QSO）的接近伴侣的光谱，从较大的QSO中选择了SDSS Stripe82区域中的QSO样本，在我们的先前工作中已经研究了宿主星系和大规模环境。新的观察结果扩大了我们以前关于12种类星体的近亲星系的QSO数量。我们在这里的分析涵盖了这项工作和先前发表的论文中的所有34个类星体。我们发现其中一半（15 QSO； $ \ sim $ 44％）至少有一个相关的星系。许多相关伴侣中有许多（12个星系； $ \ sim $ 67％）展示[OII] 3727排放线作为最近恒星形成的签名。这些星系的恒星形成率（SFR）是适中的（中值SFR $ \ sim $ 4.3 m $ _ {\ odot} $ yr $^{ - 1} $）。对于8个QSO，我们还能够检测到宿主星系的星光，其中3具有典型的恒星后星系。我们的结果表明，类星体对伴侣星系的恒星形成没有很大的影响。
We present optical spectroscopy of the close companions of 22 low redshift (z<0.5) quasars (QSO) selected from a larger sample of QSO in the SDSS Stripe82 region for which both the host galaxy and the large scale environments have been investigated in our previous work. The new observations extend the number of QSO studied in our previous paper on close companion galaxies of 12 quasars. Our analysis here covers all 34 quasars from both this work and the previously published paper. We find that half of them (15 QSO; $\sim$44%) have at least one associated galaxy. Many (12 galaxies; $\sim$67%) of the associated companions exhibit [OII] 3727 A emission line as signature of recent star formation. The star formation rate (SFR) of these galaxies is modest (median SFR $\sim$ 4.3 M$_{\odot}$ yr$^{-1}$). For 8 QSO we are also able to detect the starlight of the host galaxy from which 3 have a typical spectrum of a post-starburst galaxy. Our results suggest that quasars do not have a strong influence on the star formation of their companion galaxies.
