TY - JOUR
T1 - Star formation rates in luminous quasars at 2 < z < 3
AU - Harris, Kathryn
AU - Farrah, Duncan
AU - Schulz, Bernhard
AU - Hatziminaoglou, Evanthia
AU - Viero, Marco
AU - Anderson, Nick
AU - Béthermin, Matthieu
AU - Chapman, Scott
AU - Clements, David L.
AU - Cooray, Asantha
AU - Efstathiou, Andreas
AU - Feltre, Anne
AU - Hurley, Peter
AU - Ibar, Eduardo
AU - Lacy, Mark
AU - Oliver, Sebastian
AU - Page, Mathew J.
AU - Pérez-Fournon, Ismael
AU - Petty, Sara M.
AU - Pitchford, Lura K.
AU - Rigopoulou, Dimitra
AU - Scott, Douglas
AU - Symeonidis, Myrto
AU - Vieira, Joaquin
AU - Wang, Lingyu
N1 - Publisher Copyright:
© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
PY - 2016/2/10
Y1 - 2016/2/10
N2 - We investigate the relation between star formation rates (M˙s) and AGN properties in optically selected type 1 quasars at 2 < z < 3 using data from Herschel and the SDSS. We find that M˙s remains approximately constant with redshift, at 300 ± 100M⊙ yr-1. Conversely, M˙s increases with AGN luminosity, up to a maximum of ~600M⊙ yr-1, and with CIV FWHM. In context with previous results, this is consistent with a relation between M˙s and black hole accretion rate (M˙bh) existing in only parts of the z - M˙s - M˙bh plane, dependent on the free gas fraction, the trigger for activity, and the processes that may quench star formation. The relations between M˙s and both AGN luminosity and C IV FWHM are consistent with star formation rates in quasars scaling with black hole mass, though we cannot rule out a separate relation with black hole accretion rate. Star formation rates are observed to decline with increasing CIV equivalent width. This decline can be partially explained via the Baldwin effect, but may have an additional contribution from one or more of three factors; Mi is not a linear tracer of L2500, the Baldwin effect changes form at high AGN luminosities, and high C IV EW values signpost a change in the relation between M˙s and M˙bh. Finally, there is no strong relation between M˙s and Eddington ratio, or the asymmetry of the C IV line. The former suggests that star formation rates do not scale with how efficiently the black hole is accreting, while the latter is consistent with C IV asymmetries arising from orientation effects.
AB - We investigate the relation between star formation rates (M˙s) and AGN properties in optically selected type 1 quasars at 2 < z < 3 using data from Herschel and the SDSS. We find that M˙s remains approximately constant with redshift, at 300 ± 100M⊙ yr-1. Conversely, M˙s increases with AGN luminosity, up to a maximum of ~600M⊙ yr-1, and with CIV FWHM. In context with previous results, this is consistent with a relation between M˙s and black hole accretion rate (M˙bh) existing in only parts of the z - M˙s - M˙bh plane, dependent on the free gas fraction, the trigger for activity, and the processes that may quench star formation. The relations between M˙s and both AGN luminosity and C IV FWHM are consistent with star formation rates in quasars scaling with black hole mass, though we cannot rule out a separate relation with black hole accretion rate. Star formation rates are observed to decline with increasing CIV equivalent width. This decline can be partially explained via the Baldwin effect, but may have an additional contribution from one or more of three factors; Mi is not a linear tracer of L2500, the Baldwin effect changes form at high AGN luminosities, and high C IV EW values signpost a change in the relation between M˙s and M˙bh. Finally, there is no strong relation between M˙s and Eddington ratio, or the asymmetry of the C IV line. The former suggests that star formation rates do not scale with how efficiently the black hole is accreting, while the latter is consistent with C IV asymmetries arising from orientation effects.
KW - Galaxies: evolution
KW - Galaxies: star formation
KW - Galaxies: starburst
KW - Infrared: galaxies
KW - Quasars: general
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U2 - 10.1093/mnras/stw286
DO - 10.1093/mnras/stw286
M3 - Article
AN - SCOPUS:84963811306
SN - 0035-8711
VL - 457
SP - 4179
EP - 4194
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -