Rapid evolution and transformation into quiescence?: ALMA view on z > 6 low-luminosity quasars. Issue Volume 15:Issue S352(2019) (June 2019)

• Record Type: Journal Article
• Authors: Izumi, Takuma; Onoue, Masafusa; Matsuoka, Yoshiki; Nagao, Tohru; Strauss, Michael A.; Imanishi, Masatoshi; Kashikawa, Nobunari; Fujimoto, Seiji; Kohno, Kotaro; Toba, Yoshiki; Umehata, Hideki; Goto, Tomotsugu; Ueda, Yoshihiro; Shirakata, Hikari; Silverman, John D.; Greene, Jenny E.; Harikane, Yuichi; Hashimoto, Yasuhiro; Ikarashi, Soh; Iono, Daisuke; Iwasawa, Kazushi; Lee, Chien-Hsiu; Minezaki, Takeo; Nakanishi, Kouichiro; Tamura, Yoichi; Tang, Ji-Jia; Taniguchi, Akio
• Editors: da Cunha, Elisabete; Hodge, Jacqueline; Afonso, José; Pentericci, Laura; Sobral, David
• Is Part Of: Proceedings of the International Astronomical Union. Volume 15:Issue S352(2019)
• Page Start: 139
• Page End: 143
• Publication Date: 2019-06
• Subjects: quasars: general, -- galaxies: evolution, -- galaxies: high-redshift; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921319009487
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: We present ALMA [CII] line and far-infrared (FIR) continuum observations of seven z > 6 low-luminosity quasars ( M 1450 > −25 mag) discovered by our on-going Subaru Hyper Suprime-Cam survey. The [CII] line was detected in all targets with luminosities of ∼(2−10) × 10 8 L⊙, about one order of magnitude smaller than optically luminous quasars. Also found was a wide scatter of FIR continuum luminosity, ranging from L FIR < 10 11 L ⊙ to ∼2 × 10 12 L ⊙ . With the [CII]-based dynamical mass, we suggest that a significant fraction of low-luminosity quasars are located on or even below the local Magorrian relation, particularly at the massive end of the galaxy mass distribution. This is a clear contrast to the previous finding that luminous quasars tend to have overmassive black holes relative to the relation. Our result is expected to show a less-biased nature of the early co-evolution of black holes and their host galaxies.