No Galaxy-Scale [CII] Fast Outflow in the z=6.72 Red Quasar HSC J1205$-$0000
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2025
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| author | Sawamura, Mahoshi Izumi, Takuma Nakanishi, Kouichiro Okuda, Takeshi Strauss, Michael A. Imanishi, Masatoshi Matsuoka, Yoshiki Toba, Yoshiki Umehata, Hideki Hashimoto, Takuya Baba, Shunsuke Goto, Tomotsugu Kawaguchi, Toshihiro Kohno, Kotaro Salak, Dragan Kawamuro, Taiki Iwasawa, Kazushi Onoue, Masafusa Lee, Chien-Hsiu Lee, Kianhong |
| author_facet | Sawamura, Mahoshi Izumi, Takuma Nakanishi, Kouichiro Okuda, Takeshi Strauss, Michael A. Imanishi, Masatoshi Matsuoka, Yoshiki Toba, Yoshiki Umehata, Hideki Hashimoto, Takuya Baba, Shunsuke Goto, Tomotsugu Kawaguchi, Toshihiro Kohno, Kotaro Salak, Dragan Kawamuro, Taiki Iwasawa, Kazushi Onoue, Masafusa Lee, Chien-Hsiu Lee, Kianhong |
| contents | HSC 120505.09-000027.9 (J1205$-$0000) is one of the highest redshift ($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] $158\ \rm{μm}$ 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$-$0000 is hosted by a starburst galaxy. In contradiction to Izumi et al. (2021a), our improved analysis shows no hint of a broad component in the [CII] line spectrum. Thus there is no evidence for a host galaxy-scale fast [CII] outflow, despite the fact that J1205$-$0000 has fast nuclear ionized outflows seen in the rest-frame UV. We explore several scenarios for this discrepancy (e.g., early phase of AGN feedback, reliability of the [CII] line as a tracer of outflows), and we claim that it is still too early to conclude that there is no significant negative AGN feedback on star formation in this red quasar. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_16858 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | No Galaxy-Scale [CII] Fast Outflow in the z=6.72 Red Quasar HSC J1205$-$0000 Sawamura, Mahoshi Izumi, Takuma Nakanishi, Kouichiro Okuda, Takeshi Strauss, Michael A. Imanishi, Masatoshi Matsuoka, Yoshiki Toba, Yoshiki Umehata, Hideki Hashimoto, Takuya Baba, Shunsuke Goto, Tomotsugu Kawaguchi, Toshihiro Kohno, Kotaro Salak, Dragan Kawamuro, Taiki Iwasawa, Kazushi Onoue, Masafusa Lee, Chien-Hsiu Lee, Kianhong Astrophysics of Galaxies HSC 120505.09-000027.9 (J1205$-$0000) is one of the highest redshift ($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] $158\ \rm{μm}$ 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$-$0000 is hosted by a starburst galaxy. In contradiction to Izumi et al. (2021a), our improved analysis shows no hint of a broad component in the [CII] line spectrum. Thus there is no evidence for a host galaxy-scale fast [CII] outflow, despite the fact that J1205$-$0000 has fast nuclear ionized outflows seen in the rest-frame UV. We explore several scenarios for this discrepancy (e.g., early phase of AGN feedback, reliability of the [CII] line as a tracer of outflows), and we claim that it is still too early to conclude that there is no significant negative AGN feedback on star formation in this red quasar. |
| title | No Galaxy-Scale [CII] Fast Outflow in the z=6.72 Red Quasar HSC J1205$-$0000 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2502.16858 |