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No Galaxy-Scale [CII] Fast Outflow in the z=6.72 Red Quasar HSC J1205$-$0000 by Sawamura, Mahoshi; Izumi, Takuma; Nakanishi, Kouichiro; Okuda, Takeshi; Strauss, Michael A.; Imanishi, Masatoshi; Matsuoka, Yoshiki; Toba, Yoshiki; Umehata, Hideki; Hashimoto, Takuya; Baba, Shunsuke; Goto, Tomotsugu; Kawaguchi, Toshihiro; Kohno, Kotaro; Salak, Dragan; Kawamuro, Taiki; Iwasawa, Kazushi; Onoue, Masafusa; Lee, Chien-Hsiu; Lee, Kianhong is a scholarly article available to read on EtoBox.

What is No Galaxy-Scale [CII] Fast Outflow in the z=6.72 Red Quasar HSC J1205$-$0000 about?

HSC 120505.09-000027.9 (J1205$-$0000) is one of the highest redshift ($z=6.72$) dust-reddened quasars (red quasars) known to date. We present an improved analysis of Atacama Large Millimeter/submillimeter Array data of the [CII] $158\ \rm{\mu m}$ line and the underlying rest-frame far-infrared (FIR) continuum emission, previously reported in Izumi et al. (2021a), toward J1205$-$0000. Red quasars are thought to be a transitional phase from an obscured starburst to a luminous blue quasar, in some cases associated with massive outflows driven by the active galactic nucleus (AGN). J1205$-$0000 has a high FIR luminosity, $L_{\mathrm{FIR}}=2.5\times 10^{12}\ L_{\odot}$ and a total IR luminosity of $L_{\mathrm{TIR}}=3.5\times 10^{12}\ L_{\odot}$, corresponding to a star formation rate (SFR) of $\sim 528\ M_{\odot}\ \mathrm{yr}^{-1}$. With the [CII]-based dynamical mass of $\sim 1 \times 10^{11}~M_\odot$, we conclude that J1205$-$0000 is hosted by a starburst galaxy. In contradiction to Izumi et al. (2021a), our improved analysis shows no hint of a broad component in the [CII] line spectrum. Thus there is no evidence for a host galaxy-scale fast [CII] outflow, despite the fact that J1205$-

Author

Sawamura, Mahoshi; Izumi, Takuma; Nakanishi, Kouichiro; Okuda, Takeshi; Strauss, Michael A.; Imanishi, Masatoshi; Matsuoka, Yoshiki; Toba, Yoshiki; Umehata, Hideki; Hashimoto, Takuya; Baba, Shunsuke; Goto, Tomotsugu; Kawaguchi, Toshihiro; Kohno, Kotaro; Salak, Dragan; Kawamuro, Taiki; Iwasawa, Kazushi; Onoue, Masafusa; Lee, Chien-Hsiu; Lee, Kianhong

Published

2025

Language

EN