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Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XII. Extended [C ii] Structure (Merger or Outflow) in a z = 6.72 Red Quasar

Izumi, Takuma; Onoue, Masafusa; Matsuoka, Yoshiki; Strauss, Michael A.; Fujimoto, Seiji; Umehata, Hideki; Imanishi, Masatoshi; Kawamuro, Taiki; Nagao, Tohru; Toba, Yoshiki; Kohno, Kotaro; Kashikawa, Nobunari; Inayoshi, Kohei; Kawaguchi, Toshihiro; Iwasawa, Kazushi; Inoue, Akio K.; Goto, Tomotsugu; Baba, Shunsuke; Schramm, Malte; Suh, Hyewon; Harikane, Yuichi; Ueda, Yoshihiro; Silverman, John D.; Hashimoto, Takuya; Hashimoto, Yasuhiro; Ikarashi, Soh; Iono, Daisuke; Lee, Chien-Hsiu; Lee, Kianhong; Minezaki, Takeo; Nakanishi, Kouichiro; Nakano, Suzuka; Tamura, Yoichi; Tang, Ji-Jia

Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XII. Extended [C ii] Structure (Merger or Outflow) in a z = 6.72 Red Quasar Thumbnail


Authors

Takuma Izumi

Masafusa Onoue

Yoshiki Matsuoka

Michael A. Strauss

Seiji Fujimoto

Hideki Umehata

Masatoshi Imanishi

Taiki Kawamuro

Tohru Nagao

Yoshiki Toba

Kotaro Kohno

Nobunari Kashikawa

Kohei Inayoshi

Toshihiro Kawaguchi

Kazushi Iwasawa

Akio K. Inoue

Tomotsugu Goto

Shunsuke Baba

Malte Schramm

Hyewon Suh

Yuichi Harikane

Yoshihiro Ueda

John D. Silverman

Takuya Hashimoto

Yasuhiro Hashimoto

Soh Ikarashi

Daisuke Iono

Chien-Hsiu Lee

Kianhong Lee

Takeo Minezaki

Kouichiro Nakanishi

Suzuka Nakano

Yoichi Tamura

Ji-Jia Tang



Abstract

We present Atacama Large Millimeter/submillimeter Array [C II] 158 μm line and far-infrared (FIR) continuum emission observations toward HSC J120505.09−000027.9 (J1205−0000) at z = 6.72 with a beam size of ∼0 8 × 0 5 (or 4.1 kpc × 2.6 kpc), the most distant red quasar known to date. Red quasars are modestly reddened by dust and are thought to be in rapid transition from an obscured starburst to an unobscured normal quasar, driven by powerful active galactic nucleus (AGN) feedback that blows out a cocoon of interstellar medium. The FIR continuum of J1205−0000 is bright, with an estimated luminosity of LFIR ∼ 3 × 1012 Le. The [C II] line emission is extended on scales of r ∼ 5 kpc, greater than that of the FIR continuum. The line profiles at the extended regions are complex and broad (FWHM ∼ 630–780 km s−1 ). Although it is not practical to identify the nature of this extended structure, possible explanations include (i) companion/merging galaxies and (ii) massive AGN-driven outflows. For the case of (i), the companions are modestly star-forming (∼10 Me yr−1 ) but are not detected by our Subaru optical observations (yAB,5σ = 24.4 mag). For the case of (ii), our lower limit to the cold neutral outflow rate is ∼100 Me yr−1 . The outflow kinetic energy and momentum are both much lower than predicted in energyconserving wind models, suggesting that the AGN feedback in this quasar is not capable of completely suppressing its star formation

Citation

Izumi, T., Onoue, M., Matsuoka, Y., Strauss, M. A., Fujimoto, S., Umehata, H., …Tang, J. (2021). Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XII. Extended [C ii] Structure (Merger or Outflow) in a z = 6.72 Red Quasar. Astrophysical Journal, 908(2), Article 235. https://doi.org/10.3847/1538-4357/abd7ef

Journal Article Type Article
Acceptance Date Dec 30, 2020
Online Publication Date Feb 26, 2021
Publication Date Feb 20, 2021
Deposit Date Jan 11, 2022
Publicly Available Date Jan 11, 2022
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 908
Issue 2
Article Number 235
DOI https://doi.org/10.3847/1538-4357/abd7ef

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© 2021. The American Astronomical Society. All rights reserved.





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