학술논문
Detection of stellar light from quasar host galaxies at redshifts above 6
Document Type
Working Paper
Author
Ding, Xuheng; Onoue, Masafusa; Silverman, John D.; Matsuoka, Yoshiki; Izumi, Takuma; Strauss, Michael A.; Jahnke, Knud; Phillips, Camryn L.; Li, Junyao; Volonteri, Marta; Haiman, Zoltan; Andika, Irham Taufik; Aoki, Kentaro; Baba, Shunsuke; Bieri, Rebekka; Bosman, Sarah E. I.; Bottrell, Connor; Eilers, Anna-Christina; Fujimoto, Seiji; Habouzit, Melanie; Imanishi, Masatoshi; Inayoshi, Kohei; Iwasawa, Kazushi; Kashikawa, Nobunari; Kawaguchi, Toshihiro; Kohno, Kotaro; Lee, Chien-Hsiu; Lupi, Alessandro; Lyu, Jianwei; Nagao, Tohru; Overzier, Roderik; Schindler, Jan-Torge; Schramm, Malte; Shimasaku, Kazuhiro; Toba, Yoshiki; Trakhtenbrot, Benny; Trebitsch, Maxime; Treu, Tommaso; Umehata, Hideki; Venemans, Bram P.; Vestergaard, Marianne; Walter, Fabian; Wang, Feige; Yang, Jinyi
Source
Subject
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Abstract
The detection of starlight from the host galaxies of quasars during the reionization epoch ($z>6$) has been elusive, even with deep HST observations. The current highest redshift quasar host detected, at $z=4.5$, required the magnifying effect of a foreground lensing galaxy. Low-luminosity quasars from the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) mitigate the challenge of detecting their underlying, previously-undetected host galaxies. Here we report rest-frame optical images and spectroscopy of two HSC-SSP quasars at $z>6$ with JWST. Using NIRCam imaging at 3.6$\mu$m and 1.5$\mu$m and subtracting the light from the unresolved quasars, we find that the host galaxies are massive (stellar masses of $13\times$ and $3.4\times$ $10^{10}$ M$_{\odot}$, respectively), compact, and disk-like. NIRSpec medium-resolution spectroscopy shows stellar absorption lines in the more massive quasar, confirming the detection of the host. Velocity-broadened gas in the vicinity of these quasars enables measurements of their black hole masses ($1.4\times 10^9$ and $2.0\times$ $10^{8}$ M$_{\odot}$, respectively). Their location in the black hole mass - stellar mass plane is consistent with the distribution at low redshift, suggesting that the relation between black holes and their host galaxies was already in place less than a billion years after the Big Bang.
Comment: Matched to the published Nature version of the article. 27 pages, 4 main figures, 1 table, 6 supplementary figures, 2 supplementary table
Comment: Matched to the published Nature version of the article. 27 pages, 4 main figures, 1 table, 6 supplementary figures, 2 supplementary table