Rapid evolution and transformation into quiescence?: ALMA view on z > 6 low-luminosity quasars
Date
2020
Authors
Izumi, Takuma
Onoue, Masafusa
Matsuoka, Yoshiki
Nagao, Tohru
Strauss, Michael A.
Imanishi, Masatoshi
Kashikawa, Nobunari
Fujimoto, Seiji
Kohno, Kotaro
Toba, Yoshiki
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Publisher
Cambridge University Press
Abstract
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) x 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 x 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.
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Keywords
quasars: general, galaxies: evolution, galaxies: high-redshift
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Source
Proceedings of the International Astronomical Union
Type
Journal article
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2099-12-31