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

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., Imanishi, M., Kawamuro, T., Nagao, T., Toba, Y., Kohno, K., Kashikawa, N., Inayoshi, K., Kawaguchi, T., Iwasawa, K., Inoue, A. K., Goto, T., Baba, S., Schramm, M., Suh, H., …Tang, J.-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
• Public URL: https://durham-repository.worktribe.com/output/1219032