Journal
ASTRONOMY & ASTROPHYSICS
Volume 518, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201014565
Keywords
galaxies: active; infrared: galaxies; quasars: general; galaxies: formation; submillimeter: galaxies; galaxies: starburst
Categories
Funding
- STFC [PP/D002400/1, ST/G002533/1]
- Alfred P. Sloan Foundation
- NSF
- U.S. Department of Energy
- NASA
- Japanese Monbukagakusho
- Max Planck Society
- HEFCE
- STFC [ST/G001871/1, ST/G002533/1, ST/G002622/1, ST/H001530/1, ST/F007280/1, PP/D000963/1, ST/H004254/1, ST/F00298X/1, PP/D002400/1, PP/E001173/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H004254/1, ST/F00298X/1, ST/G002622/1, PP/D000963/1, PP/E001173/1, ST/G001871/1, PP/E001181/1, ST/F007280/1, ST/G002533/1] Funding Source: researchfish
- UK Space Agency [ST/G003874/1] Funding Source: researchfish
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We present a derivation of the star formation rate per comoving volume of quasar host galaxies, derived from stacking analyses of far-infrared to mm-wave photometry of quasars with redshifts 0 z 6 and absolute I-band magnitudes -22 > I-AB > -32 We use the science demonstration observations of the first similar to 16 deg(2) from the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) in which there are 240 quasars from the Sloan Digital Sky Survey (SDSS) and a further 171 from the 2dF-SDSS LRG and QSO (2SLAQ) survey. We supplement this data with a compilation of data from IRAS, ISO, Spitzer, SCUBA and MAMBO. H-ATLAS alone statistically detects the quasars in its survey area at > 5 sigma at 250, 350 and 500 mu m. From the compilation as a whole we find striking evidence of downsizing in quasar host galaxy formation: low-luminosity quasars with absolute magnitudes in the range -22 > I-AB > -24 have a comoving star formation rate (derived from 100 mu m rest-frame luminosities) peaking between redshifts of 1 and 2, while high-luminosity quasars with I-AB -26 have a maximum contribution to the star formation density at z similar to 3. The volume-averaged star formation rate of -22 > IAB > -24 quasars evolves as (1 + z)(2.3 +/- 0.7) at z 2, but the evolution at higher luminosities is much faster reaching (1 + z)(10 +/- 1) at -26 > I-AB > -28. We tentatively interpret this as a combination of a declining major merger rate with time and gas consumption reducing fuel for both black hole accretion and star formation.
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