GOODS-Herschel: the far-infrared view of star formation in active galactic nucleus host galaxies since z similar to 3

Autor: Mullaney, JR, Pannella, M, Daddi, E, Alexander, DM, Elbaz, D, Hickox, RC, Bournaud, F, Altieri, B, Aussel, H, Coia, D, Dannerbauer, H, Dasyra, K, Dickinson, M, Hwang, HS, Kartaltepe, J, Leiton, R, Magdis, G, Magnelli, B, Popesso, P, Valtchanov, I, Bauer, FE, Brandt, WN, Del Moro, A, Hanish, DJ, Ivison, RJ, Juneau, S, Luo, B, Lutz, D, Sargent, MT, Scott, D, Xue, YQ
Jazyk: angličtina
Rok vydání: 2012
Předmět:
Zdroj: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 419(1)
ISSN: 1365-2966
0035-8711
Popis: We present a study of the infrared properties of X-ray selected, moderate-luminosity (i.e.LX= 1042-1044ergs-1) active galactic nuclei (AGNs) up toz≈ 3, in order to explore the links between star formation in galaxies and accretion on to their central black holes. We use 100 and 160μ mfluxes from GOODS-Herschel- the deepest survey yet undertaken by theHerscheltelescope - and show that in the vast majority of cases (i.e. >94percent) these fluxes are dominated by emission from the host galaxy. As such, these far-infrared bands provide an uncontaminated view of star formation in the AGN host galaxies. We find no evidence of any correlation between the X-ray and infrared luminosities of moderate AGNs at any redshift, suggesting that global star formation is decoupled from nuclear (i.e. AGN) activity in these galaxies. On the other hand, we confirm that the star formation rates of AGN hosts increase strongly with redshift, by a factor of 43+27- 18 fromz< 0.1 toz= 2-3 for AGNswith the same range of X-ray luminosities. This increase is entirely consistent with the factor of 25-50 increase in the specific star formation rates (SSFRs) of normal, star-forming (i.e. main-sequence) galaxies over the same redshift range. Indeed, the average SSFRs of AGN hosts are only marginally (i.e. ≈20percent) lower than those of main-sequence galaxies at all surveyed redshifts, with this small deficit being due to a fraction of AGNs residing in quiescent (i.e. low SSFR) galaxies. We estimate that 79 ± 10percent of moderate-luminosity AGNs are hosted in main-sequence galaxies, 15 ± 7percent in quiescent galaxies and
Databáze: OpenAIRE
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