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  Dust Emission in an Accretion-rate-limited Sample of z ≳ 6 Quasars

Venemans, B. P., Decarli, R., Walter, F., Bañados, E., Bertoldi, F., Fan, X., et al. (2018). Dust Emission in an Accretion-rate-limited Sample of z ≳ 6 Quasars. The Astrophysical Journal, 866.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CA76-3 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CA77-2
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018ApJ...866..159V (Any fulltext)
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 Creators:
Venemans, Bram P.1, Author
Decarli, Roberto1, Author
Walter, Fabian1, Author
Bañados, Eduardo1, Author
Bertoldi, Frank1, Author
Fan, Xiaohui1, Author
Farina, Emanuele Paolo1, Author
Mazzucchelli, Chiara1, Author
Riechers, Dominik1, Author
Rix, Hans-Walter1, Author
Wang, Ran1, Author
Yang, Yujin1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: high-redshift galaxies: star formation galaxies: statistics quasars: general Astrophysics - Astrophysics of Galaxies Astrophysics - Cosmology and Nongalactic Astrophysics
 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).

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 Dates: 2018
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 866 Sequence Number: - Start / End Page: - Identifier: -