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Rapid evolution and transformation into quiescence?: ALMA view on z > 6 low-luminosity quasars

Published online by Cambridge University Press:  04 June 2020

Takuma Izumi
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo, 181-8588Japan email: takuma.izumi@nao.ac.jp Department of Astronomical Science, SOKENDAI, Mitaka, Tokyo, Japan
Masafusa Onoue
Affiliation:
Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
Yoshiki Matsuoka
Affiliation:
Research Center for Space and Cosmic Evolution, Ehime University, Ehime, Japan
Tohru Nagao
Affiliation:
Research Center for Space and Cosmic Evolution, Ehime University, Ehime, Japan
Michael A. Strauss
Affiliation:
Princeton University Observatory, Peyton Hall, Princeton, NJ08544, USA
Masatoshi Imanishi
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo, 181-8588Japan email: takuma.izumi@nao.ac.jp Department of Astronomical Science, SOKENDAI, Mitaka, Tokyo, Japan
Nobunari Kashikawa
Affiliation:
Department of Astronomy, School of Science, The University of Tokyo, Tokyo, Japan
Seiji Fujimoto
Affiliation:
Institute for Cosmic Ray Research, The University of Tokyo, Chiba, Japan
Kotaro Kohno
Affiliation:
Institute of Astronomy, Graduate School of Science, The University of Tokyo, Tokyo, Japan
Yoshiki Toba
Affiliation:
Research Center for Space and Cosmic Evolution, Ehime University, Ehime, Japan Department of Astronomy, Kyoto University, Kyoto, Japan
Hideki Umehata
Affiliation:
Institute of Astronomy, Graduate School of Science, The University of Tokyo, Tokyo, Japan RIKEN Cluster for Pioneering Research, Saitama, Japan
Tomotsugu Goto
Affiliation:
Institute of Astronomy and Department of Physics, National Tsing Hua University, Taiwan
Yoshihiro Ueda
Affiliation:
Department of Astronomy, Kyoto University, Kyoto, Japan
Hikari Shirakata
Affiliation:
Department of Cosmosciences, Hokkaido University, Hokkaido, Japan
John D. Silverman
Affiliation:
Kavli Institute for the Physics and Mathematics of the Universe, Chiba, Japan
Jenny E. Greene
Affiliation:
Department of Astrophysics, Princeton University, Princeton, NJ, USA
Yuichi Harikane
Affiliation:
Institute for Cosmic Ray Research, The University of Tokyo, Chiba, Japan
Yasuhiro Hashimoto
Affiliation:
Department of Earth Sciences, National Taiwan Normal University, Taipei, Taiwan
Soh Ikarashi
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, Groningen, Netherlands
Daisuke Iono
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo, 181-8588Japan email: takuma.izumi@nao.ac.jp Department of Astronomical Science, SOKENDAI, Mitaka, Tokyo, Japan
Kazushi Iwasawa
Affiliation:
ICREA and Institut de Ciències del Cosmos, Universitat de Barcelona, Barcelona, Spain
Takeo Minezaki
Affiliation:
Institute of Astronomy, Graduate School of Science, The University of Tokyo, Tokyo, Japan
Kouichiro Nakanishi
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo, 181-8588Japan email: takuma.izumi@nao.ac.jp Department of Astronomical Science, SOKENDAI, Mitaka, Tokyo, Japan
Yoichi Tamura
Affiliation:
Division of Particle and Astrophysical Science, Nagoya University, Aichi, Japan
Ji-Jia Tang
Affiliation:
Australian National University, Weston Creek, Australia
Akio Taniguchi
Affiliation:
Division of Particle and Astrophysical Science, Nagoya University, Aichi, Japan
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Abstract

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We present ALMA [CII] line and far-infrared (FIR) continuum observations of seven z > 6 low-luminosity quasars (M1450 > −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) × 108 L, about one order of magnitude smaller than optically luminous quasars. Also found was a wide scatter of FIR continuum luminosity, ranging from LFIR < 1011L to ∼2 × 1012L. 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.

Type
Contributed Papers
Copyright
© International Astronomical Union 2020

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