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GOODS-Herschel: The far-infrared view of star formation in AGN host galaxies since z~3 | | J. R. Mullaney
; M. Pannella
; E. Daddi
; D. M. Alexander
; D. Elbaz
; R. C. Hickox
; F. Bournaud
; B. Altieri
; H. Aussel
; D. Coia
; H. Dannerbauer
; K. Dasyra
; M. Dickinson
; H. S. Hwang
; J. Kartaltepe
; R. Leiton
; G. Magdis
; B. Magnelli
; P. Popesso
; I. Valtchanov
; A. Del Moro
; D. J. Hanish
; R. J. Ivison
; S. Juneau
; D. Lutz
; M. T. Sargent
; | | Date: |
21 Jun 2011 | | Abstract: | Using 100um and 160um fluxes from GOODS-Herschel - the deepest survey
undertaken by the Herschel telescope - we explore the infrared properties of
X-ray AGNs up to z~3. The observed 100um and 160um fluxes are dominated by the
host galaxy in the vast majority of cases (>94 per cent), meaning that these
far-infrared fluxes provide an uncontaminated view of the star formation in the
host galaxies. There is no evidence of any correlation between the levels of
AGN and global star formation activity at all surveyed redshifts. We confirm
that the star formation rates of AGN hosts increase strongly with redshift; by
a factor of 43^{+27}_{-18} from z<0.1 to z=2-3 for AGNs with the same range of
X-ray luminosities (Lx=10^42-10^44 ergs/s). This increase is 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 (20 per cent)
lower than those of main-sequence galaxies at all redshifts. Between 79+/-10
per cent of moderate luminosity (Lx=10^42-10^44 ergs/s) AGNs are hosted in
main-sequence galaxies, 15+/-7 per cent in quiescent galaxies and <10 per cent
in strongly starbursting galaxies. We derive the fractions of all main sequence
galaxies at z<2 that are experiencing a period of moderate nuclear activity,
noting it is strongly dependent on galaxy stellar mass (Mstars); rising from a
few per cent at Mstars~10^{10}Msun to >50 per cent at Mstars>10^{11}Msun. We
argue that our findings imply that the majority of moderate nuclear activity is
fuelled by internal mechanisms rather than violent mergers, which suggests that
high redshift disk instabilities could be an important AGN feeding mechanism.
Our results also show it is stellar mass that is most important in dictating
whether a galaxy hosts a moderate luminosity AGN. | | Source: | arXiv, 1106.4284 | | Services: | Forum | Review | PDF | Favorites | |
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