分类： 天文学 >> 天文学 提交时间： 2023-02-19
Junyao Li
John D. Silverman
Xuheng Ding
Michael A. Strauss
Andy Goulding
Simon Birrer
Hassen M. Yesuf
Yongquan Xue
Lalitwadee Kawinwanichakij
Yoshiki Matsuoka
Yoshiki Toba
Tohru Nagao
Malte Schramm
Kohei Inayoshi
摘要： The relationship between quasars and their host galaxies provides clues on
how supermassive black holes (SMBHs) and massive galaxies are jointly
assembled. To elucidate this connection, we measure the structural and
photometric properties of the host galaxies of ~5000 SDSS quasars at 0.2
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Junyao Li
John D. Silverman
Andrea Merloni
Mara Salvato
Johannes Buchner
Andy Goulding
Teng Liu
Riccardo Arcodia
Johan Comparat
Xuheng Ding
Kohei Ichikawa
Masatoshi Imanishi
Toshihiro Kawaguchi
Lalitwadee Kawinwanichakij
Yoshiki Toba
摘要： We investigate the physical properties, such as star-forming activity, disk
vs. bulge nature, galaxy size, and obscuration of 3796 X-ray selected AGNs at
$0.2
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Shenli Tang
John D. Silverman
Xuheng Ding
Junyao Li
Khee-Gan Lee
Michael A. Strauss
Andy Goulding
Malte Schramm
Lalitwadee Kawinwanichakij
J. Xavier Prochaska
Joseph F. Hennawi
Masatoshi Imanishi
Kazushi Iwasawa
Yoshiki Toba
Issha Kayo
Masamune Oguri
Yoshiki Matsuoka
Kohei Ichikawa
Tilman Hartwig
Nobunari Kashikawa
摘要： We report on a spectroscopic program to search for dual quasars using Subaru Hyper Suprime-Cam (HSC) images of SDSS quasars which represent an important stage during galaxy mergers. Using Subaru/FOCAS and Gemini-N/GMOS, we identify three new physically associated quasar pairs having projected separations less than 20 kpc, out of 26 observed candidates. These include the discovery of the highest redshift ($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, we find that the black holes in these systems have black hole masses ($M_{BH} \sim 10^{8-9}M_{\odot}$) similar to single SDSS quasars as well as their bolometric luminosities and Eddington ratios. 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 prior to the final coalescence of the two SMBHs, resulting in early mass growth of the black holes relative to their host galaxies.
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