分类： 天文学 >> 天文学 提交时间： 2023-02-19
Kohei Ichikawa
Takuji Yamashita
Andrea Merloni
Junyao Li
Teng Liu
Mara Salvato
Masayuki Akiyama
Riccardo Arcodia
Tom Dwelly
Xiaoyang Chen
Masatoshi Imanishi
Kohei Inayoshi
Toshihiro Kawaguchi
Taiki Kawamuro
Mitsuru Kokubo
Yoshiki Matsuoka
Tohru Nagao
Malte Schramm
Hyewon Suh
Masayuki Tanaka
摘要： We construct the eROSITA X-ray catalog of radio galaxies discovered by the
WERGS survey that is made by the cross-matching of the wide-area Subaru/HSC
optical survey and VLA/FIRST 1.4 GHz radio survey. We find 393 eROSITA detected
radio galaxies in the 0.5--2 keV band in the eFEDS field covering 140~deg$^2$.
Thanks to the wide and medium depth eFEDS X-ray survey, the sample contains the
rare and most X-ray luminous radio galaxies above the knee of the X-ray
luminosity function, spanning 4422$. Those obscured
and radio AGN reside in $0.4
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Shenli Tang
John D. Silverman
Xuheng Ding
Junyao Li
Khee-Gan Lee
Michael A. Strauss
Andy Goulding
Malte Schramm
Lalitwadee Kawinwanichakij
J. Xavier Prochaska
Joseph F. Hennawi
Masatoshi Imanishi
Kazushi Iwasawa
Yoshiki Toba
Issha Kayo
Masamune Oguri
Yoshiki Matsuoka
Kohei Ichikawa
Tilman Hartwig
Nobunari Kashikawa
摘要： We report on a spectroscopic program to search for dual quasars using Subaru Hyper Suprime-Cam (HSC) images of SDSS quasars which represent an important stage during galaxy mergers. Using Subaru/FOCAS and Gemini-N/GMOS, we identify three new physically associated quasar pairs having projected separations less than 20 kpc, out of 26 observed candidates. These include the discovery of the highest redshift ($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.
点击量
待评议
点击量
下载量
评论
