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

Takuma Izumi; Masafusa Onoue; Yoshiki Matsuoka; Tohru Nagao; Michael A. Strauss; Masatoshi Imanishi; Nobunari Kashikawa; Seiji Fujimoto; Kotaro Kohno; Yoshiki Toba; Hideki Umehata; Tomotsugu Goto; Yoshihiro Ueda; Hikari Shirakata; John D. Silverman; Jenny E. Greene; Yuichi Harikane; Yasuhiro Hashimoto; Soh Ikarashi; Daisuke Iono; Kazushi Iwasawa; Chien Hsiu Lee; Takeo Minezaki; Kouichiro Nakanishi; Yoichi Tamura; Ji Jia Tang; Akio Taniguchi

doi:10.1017/S1743921319009487

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

Takuma Izumi, Masafusa Onoue, Yoshiki Matsuoka, Tohru Nagao, Michael A. Strauss, Masatoshi Imanishi, Nobunari Kashikawa, Seiji Fujimoto, Kotaro Kohno, Yoshiki Toba, Hideki Umehata, Tomotsugu Goto, Yoshihiro Ueda, Hikari Shirakata, John D. Silverman, Jenny E. Greene, Yuichi Harikane, Yasuhiro Hashimoto, Soh Ikarashi, Daisuke IonoKazushi Iwasawa, Chien Hsiu Lee, Takeo Minezaki, Kouichiro Nakanishi, Yoichi Tamura, Ji Jia Tang, Akio Taniguchi

Department of Earth Sciences (Include Institute of Marine Environmental Science and Technology)

Research output: Contribution to journal › Article › peer-review

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) × 108 Lo, about one order of magnitude smaller than optically luminous quasars. Also found was a wide scatter of FIR continuum luminosity, ranging from LFIR < 1011Lo to 1/42 × 1012Lo. 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.

Original language	English
Pages (from-to)	139-143
Number of pages	5
Journal	Proceedings of the International Astronomical Union
DOIs	https://doi.org/10.1017/S1743921319009487
Publication status	Accepted/In press - 2020

Keywords

galaxies: evolution
galaxies: high-redshift
quasars: general

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1017/S1743921319009487

Cite this

Izumi, T., Onoue, M., Matsuoka, Y., Nagao, T., Strauss, M. A., Imanishi, M., Kashikawa, N., Fujimoto, S., Kohno, K., Toba, Y., Umehata, H., Goto, T., Ueda, Y., Shirakata, H., Silverman, J. D., Greene, J. E., Harikane, Y., Hashimoto, Y., Ikarashi, S., ... Taniguchi, A. (Accepted/In press). Rapid evolution and transformation into quiescence? ALMA view on z > 6 low-luminosity quasars. Proceedings of the International Astronomical Union, 139-143. https://doi.org/10.1017/S1743921319009487

Izumi, T, Onoue, M, Matsuoka, Y, Nagao, T, Strauss, MA, Imanishi, M, Kashikawa, N, Fujimoto, S, Kohno, K, Toba, Y, Umehata, H, Goto, T, Ueda, Y, Shirakata, H, Silverman, JD, Greene, JE, Harikane, Y, Hashimoto, Y, Ikarashi, S, Iono, D, Iwasawa, K, Lee, CH, Minezaki, T, Nakanishi, K, Tamura, Y, Tang, JJ & Taniguchi, A 2020, 'Rapid evolution and transformation into quiescence? ALMA view on z > 6 low-luminosity quasars', Proceedings of the International Astronomical Union, pp. 139-143. https://doi.org/10.1017/S1743921319009487

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

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) × 108 Lo, about one order of magnitude smaller than optically luminous quasars. Also found was a wide scatter of FIR continuum luminosity, ranging from LFIR < 1011Lo to 1/42 × 1012Lo. 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.",

keywords = "galaxies: evolution, galaxies: high-redshift, quasars: general",

author = "Takuma Izumi and Masafusa Onoue and Yoshiki Matsuoka and Tohru Nagao and Strauss, {Michael A.} and Masatoshi Imanishi and Nobunari Kashikawa and Seiji Fujimoto and Kotaro Kohno and Yoshiki Toba and Hideki Umehata and Tomotsugu Goto and Yoshihiro Ueda and Hikari Shirakata and Silverman, {John D.} and Greene, {Jenny E.} and Yuichi Harikane and Yasuhiro Hashimoto and Soh Ikarashi and Daisuke Iono and Kazushi Iwasawa and Lee, {Chien Hsiu} and Takeo Minezaki and Kouichiro Nakanishi and Yoichi Tamura and Tang, {Ji Jia} and Akio Taniguchi",

note = "Publisher Copyright: {\textcopyright} 2020 International Astronomical Union.",

year = "2020",

doi = "10.1017/S1743921319009487",

language = "English",

pages = "139--143",

journal = "Proceedings of the International Astronomical Union",

issn = "1743-9213",

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TY - JOUR

T1 - Rapid evolution and transformation into quiescence?

T2 - ALMA view on z > 6 low-luminosity quasars

AU - Izumi, Takuma

AU - Onoue, Masafusa

AU - Matsuoka, Yoshiki

AU - Nagao, Tohru

AU - Strauss, Michael A.

AU - Imanishi, Masatoshi

AU - Kashikawa, Nobunari

AU - Fujimoto, Seiji

AU - Kohno, Kotaro

AU - Toba, Yoshiki

AU - Umehata, Hideki

AU - Goto, Tomotsugu

AU - Ueda, Yoshihiro

AU - Shirakata, Hikari

AU - Silverman, John D.

AU - Greene, Jenny E.

AU - Harikane, Yuichi

AU - Hashimoto, Yasuhiro

AU - Ikarashi, Soh

AU - Iono, Daisuke

AU - Iwasawa, Kazushi

AU - Lee, Chien Hsiu

AU - Minezaki, Takeo

AU - Nakanishi, Kouichiro

AU - Tamura, Yoichi

AU - Tang, Ji Jia

AU - Taniguchi, Akio

PY - 2020

Y1 - 2020

N2 - 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 Lo, about one order of magnitude smaller than optically luminous quasars. Also found was a wide scatter of FIR continuum luminosity, ranging from LFIR < 1011Lo to 1/42 × 1012Lo. 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.

AB - 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 Lo, about one order of magnitude smaller than optically luminous quasars. Also found was a wide scatter of FIR continuum luminosity, ranging from LFIR < 1011Lo to 1/42 × 1012Lo. 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.

KW - galaxies: evolution

KW - galaxies: high-redshift

KW - quasars: general

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