Dust Emission in an Accretion-rate-limited Sample of z ≳ 6 Quasars
Journal
Date Issued
2018
Author(s)
Venemans, Bram P.
•
•
Walter, Fabian
•
Bañados, Eduardo
•
Bertoldi, Frank
•
Fan, Xiaohui
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Farina, Emanuele Paolo
•
Mazzucchelli, Chiara
•
Riechers, Dominik
•
Rix, Hans-Walter
•
Wang, Ran
•
Yang, Yujin
Abstract
We present Atacama Large Millimeter Array 1 mm observations of the rest-frame far-infrared (FIR) dust continuum in 27 quasars at redshifts 6.0 ≲ z < 6.7. We detect FIR emission at ≳3σ in all quasar host galaxies with flux densities at ∼1900 GHz in the rest-frame of 0.12 < S rest,1900 GHz < 5.9 mJy, with a median (mean) flux density of 0.88 mJy (1.59 mJy). The implied FIR luminosities range from {L}FIR} = (0.27-13) × 1012 {L}☉ , with 74% of our quasar hosts having {L}FIR} > 1012 {L}☉ . The estimated dust masses are {M}dust} = 107-109 {M}☉ . If the dust is heated only by star formation, then the star formation rates in the quasar host galaxies are between 50 and 2700 {M}☉ {yr}}-1. In the framework of the host galaxy-black hole coevolution model a correlation between ongoing black hole growth and star formation in the quasar host galaxy would be expected. However, combined with results from the literature to create a luminosity-limited quasar sample, we do not find a strong correlation between quasar UV luminosity (a proxy for ongoing black hole growth) and FIR luminosity (star formation in the host galaxy). The absence of such a correlation in our data does not necessarily rule out the coevolution model, and could be due to a variety of effects (including different timescales for black hole accretion and FIR emission).
Volume
866
Issue
2
Start page
159
Issn Identifier
0004-637X
Ads BibCode
2018ApJ...866..159V
Rights
open.access
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