10-1093-MNRAS-stw286.pdf (1.47 MB)
Star formation rates in luminous quasars at 2
journal contribution
posted on 2023-06-09, 01:19 authored by Kathryn Harris, Duncan Farrah, Bernhard Schulz, Evanthia Hatziminaoglou, Marco Viero, Nick Anderson, Matthieu Béthermin, Scott Chapman, David L Clements, Asantha Cooray, Andreas Efstathiou, Anne Feltre, Pete Hurley, Eduardo Ibar, Mark Lacy, Seb OliverSeb Oliver, Mathew J Page, Ismael Pérez-Fournon, Sara M. Petty, Lura K Pitchford, Dimitra Rigopoulou, Douglas Scott, Myrto Symeonidis, Joaquin Vieira, Lingyu WangWe investigate the relation between star formation rates (M ? s 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 M?s remains approximately constant with redshift, at 300 ± 100?M??yr-1. Conversely, M ? s M?s increases with AGN luminosity, up to a maximum of ~ 600?M??yr-1, and with C?IV FWHM. In context with previous results, this is consistent with a relation between M ? s M?s and black hole accretion rate (M ? bh M?bh ) existing in only parts of the z-M ? s -M ? bh 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 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 C?IV 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 M?s and M ? bh M?bh . Finally, there is no strong relation between M ? s 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.
Funding
UKSA
STFC
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Publication status
- Published
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- Published version
Journal
Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711Publisher
Wiley-BlackwellExternal DOI
Issue
4Volume
457Page range
4179-4194Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2016-05-20First Open Access (FOA) Date
2016-05-20First Compliant Deposit (FCD) Date
2016-05-19Usage metrics
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