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

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 SuhYuichi 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

*Corresponding author for this work

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12 Citations (Scopus)


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 L FIR ∼ 3 × 1012 L o˙. 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 M o˙ yr-1) but are not detected by our Subaru optical observations (y AB,5σ = 24.4 mag). For the case of (ii), our lower limit to the cold neutral outflow rate is ∼100 M o˙ yr-1. The outflow kinetic energy and momentum are both much lower than predicted in energy-conserving wind models, suggesting that the AGN feedback in this quasar is not capable of completely suppressing its star formation.

Original languageEnglish
Article number235
JournalAstrophysical Journal
Issue number2
Publication statusPublished - 2021 Feb 20

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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