Optical Spectroscopy of Dual Quasar Candidates from the Subaru HSC-SSP program-猫眼课题宝

DOI：

10.3847/1538-4357/ac1ff0

发表时间：

2021-05

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

Shenli Tang;J. Silverman;Xuheng Ding;Junyao Li;K. Lee;M. Strauss;A. Goulding;M. Schramm;L. Kawinwanichakij;J. Xavier Prochaska;J. Hennawi;M. Imanishi;K. Iwasawa;Y. Toba;I. Kayo;M. Oguri;Y. Matsuoka;M. Onoue;K. Jahnke;K. Ichikawa;T. Hartwig;N. Kashikawa;T. Kawaguchi;K. Kohno;Y. Matsuda;T. Nagao;Y. Ono;M. Ouchi;K. Shimasaku;H. Suh;N. Suzuki;Y. Taniguchi;Y. Ueda;N. Yasuda

我们报告的光谱计划，寻找双类星体使用斯巴鲁超Suprime-Cam（HSC）的SDSS类星体，这代表了星系合并过程中的一个重要阶段的图像。使用斯巴鲁/FOCAS和Gemini-N/GMOS，我们确定了三个新的物理相关的类星体对，预计分离小于20千秒差距，出26个观察到的候选人。其中包括发现最高红移（z = 3.1）的类星体对，其距离小于10 kpc。根据迄今为止获得的样本，当根据HSC颜色排除恒星时，识别物理相关的双类星体的成功率为19%。利用光谱学证实的六个对偶类星体的完整样本，包括三个先前发表的，我们发现这些系统中的黑洞具有黑洞质量（M BH <$108 −9 M <$），热光度（log L bol <$44.5 -47.5 erg s-1）和爱丁顿比（0.01-0.3），类似于单个SDSS类星体。我们测量恒星质量的基础上的五个波段（灰色）的光发射的二维图像分解的主机星系和评估超大质量黑洞（SMBHs）和他们的主机之间的质量关系。双SMBH相对于它们的宿主星系似乎有更高的质量。因此，合并可能不一定会使这些系统符合当地的质量关系，如地平线活动星系核模拟所建议的那样。这项研究表明，双发光类星体是在两个SMBH最终合并之前由合并触发的，导致黑洞相对于其宿主星系的早期质量增长。

We report on a spectroscopic program to search for dual quasars using Subaru Hyper Suprime-Cam (HSC) images of SDSS quasars, which represent an important stage during galaxy mergers. Using Subaru/FOCAS and Gemini-N/GMOS, we identify three new physically associated quasar pairs having projected separations less than 20 kpc, out of 26 observed candidates. These include the discovery of the highest-redshift (z = 3.1) quasar pair with a separation <10 kpc. Based on the sample acquired to date, the success rate of identifying physically associated dual quasars is 19% when excluding stars based on their HSC colors. Using the full sample of six spectroscopically confirmed dual quasars, including three previously published, we find that the black holes in these systems have black hole masses (M BH ∼ 108−9 M ⊙), bolometric luminosities (log L bol ∼ 44.5–47.5 erg s–1) and Eddington ratios (0.01–0.3) similar to single SDSS quasars. We measure the stellar mass of their host galaxies based on 2D image decomposition of the five-band (grizy) optical emission and assess the mass relation between supermassive black holes (SMBHs) and their hosts. Dual SMBHs appear to have elevated masses relative to their host galaxies. Thus, mergers may not necessarily align such systems onto the local mass relation, as suggested by the Horizon-AGN simulation. This study suggests that dual luminous quasars are triggered by mergers prior to the final coalescence of the two SMBHs, resulting in early mass growth of the black holes relative to their host galaxies.

Optical Spectroscopy of Dual Quasar Candidates from the Subaru HSC-SSP program

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