Bibcode
Pitchford, L. K.; Hatziminaoglou, E.; Feltre, A.; Farrah, D.; Clarke, C.; Harris, K. A.; Hurley, P.; Oliver, S.; Page, M.; Wang, L.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 462, Issue 4, p.4067-4077
Advertised on:
11
2016
Citations
40
Refereed citations
37
Description
We explore the relationship between active galactic nuclei (AGN) and
star formation in a sample of 513 optically luminous type 1 quasars up
to redshifts of ˜4 hosting extremely high star formation rates
(SFRs). The quasars are selected to be individually detected by the
Herschel SPIRE instrument at >3σ at 250 μm, leading to
typical SFRs of order of 1000 M⊙ yr-1. We find
the average SFRs to increase by almost a factor 10 from z ˜ 0.5 to
z ˜ 3, mirroring the rise in the comoving SFR density over the
same epoch. However, we find that the SFRs remain approximately constant
with increasing accretion luminosity for accretion luminosities above
1012 L⊙. We also find that the SFRs do not
correlate with black hole mass. Both of these results are most plausibly
explained by the existence of a self-regulation process by the starburst
at high SFRs, which controls SFRs on time-scales comparable to or
shorter than the AGN or starburst duty cycles. We additionally find that
SFRs do not depend on Eddington ratio at any redshift, consistent with
no relation between SFR and black hole growth rate per unit black hole
mass. Finally, we find that high-ionization broad absorption line
(HiBAL) quasars have indistinguishable far-infrared properties to those
of classical quasars, consistent with HiBAL quasars being normal quasars
observed along a particular line of sight, with the outflows in HiBAL
quasars not having any measurable effect on the star formation in their
hosts.