Astrophys. J., 866, 159-159 (2018/October-3)
Dust emission in an accretion-rate-limited sample of z >= 6 quasars.
VENEMANS B.P., DECARLI R., WALTER F., BANADOS E., BERTOLDI F., FAN X., FARINA E.P., MAZZUCCHELLI C., RIECHERS D., RIX H.-W., WANG R. and YANG Y.
Abstract (from CDS):
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 LFIR = (0.27-13) x 1012 L☉, with 74% of our quasar hosts having LFIR > 1012 L☉. The estimated dust masses are Mdust = 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).
© 2018. The American Astronomical Society. All rights reserved.
galaxies: high-redshift - galaxies: star formation - galaxies: statistics - quasars: general
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