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Co-evolution of black hole growth and star formation from a cross-correlation analysis between quasars and the cosmic infrared background
Journal article   Open access

Co-evolution of black hole growth and star formation from a cross-correlation analysis between quasars and the cosmic infrared background

Lingyu Wang, Marco Viero, Nicholas P. Ross, Viktoria Asboth, Matthieu Bethermin, Jamie Bock, Dave Clements, Alex Conley, Asantha Cooray, Duncan Farrah, …
Monthly notices of the Royal Astronomical Society, v 449(4), pp 4476-4493
01 Jun 2015
url
https://doi.org/10.1093/mnras/stv559View
Published, Version of Record (VoR)Maybe Open Access (Publisher Bronze) Open

Abstract

Astronomy & Astrophysics Science & Technology Physical Sciences
We present the first cross-correlation measurement between Sloan Digital Sky Survey type 1 quasars and the cosmic infrared background (CIB) measured by Herschel. The quasars cover the redshift range 0.15 < z < 3.5 where most of the CIB originates. We detect the sub-millimetre emission of the quasars, which dominates on small scales, and correlated emission from dusty star-forming galaxies (DSFGs) dominant on larger scales. The mean flux of the Data Release 7 (DR7) quasars (median redshift < z > = 1.4) is 11.1, 7.1 and 3.6 mJy at 250, 350 and 500 mu m, respectively, while the mean flux of the DR9 quasars (< z > = 2.5) is 5.7, 5.0 and 1.8 mJy at 250, 350 and 500 mu m, respectively. Assuming a modified blackbody spectral energy distribution with a power law in the mid-infrared, we infer that the mean infrared luminosity of the DR7 and DR9 quasars is 10(12.4) and 10(12.8) L-circle dot, respectively. The correlated emission arises from DSFGs in the same halo as the quasar (the one-halo term) and DSFGs in separate haloes correlated with the quasar-hosting halo (the two-halo term). Using a simple halo model, we find that most quasars are hosted by central galaxies. The host halo mass scale of the DR7 central and satellite quasars is 10(12.4 +/- 0.9) and 10(13.6 +/- 0.4) M-circle dot, respectively. The host halo mass scale of the DR9 central and satellite quasars is 10(12.3 +/- 0.6) and 10(12.8 +/- 0.4) M-circle dot, respectively. Thus, the halo environment of the central quasars is similar to that of the most actively star-forming galaxies, which supports the view that dusty starburst and quasar activity are evolutionarily linked.

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