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2010MNRAS.405.2505N - Mon. Not. R. Astron. Soc., 405, 2505-2520 (2010/July-2)
The role of nuclear activity as the power source of ultraluminous infrared galaxies.
NARDINI E., RISALITI G., WATABE Y., SALVATI M. and SANI E.
Abstract (from CDS):
(1) The AGN detection rate among local ULIRGs amounts up to 70 per cent, with 113/164 convincing detections within our sample, while the global AGN/SB power balance is ∼1/3.
(2) A general agreement is found with optical classification; however, among the objects with no spectral signatures of nuclear activity, our IR diagnostics find a subclass of elusive, highly obscured AGN.
(3) We analyse the correlation between nuclear activity and IR luminosity, recovering the well-known trend of growing AGN significance as a function of the overall energy output of the system: the sources exclusively powered by star formation are mainly found at LIR< 1012.3 L☉, while the average AGN contribution rises from ∼10 to ∼60 per cent across the ULIRG luminosity range.
(4) From a morphological point of view, we confirm that the AGN content is larger in compact systems, but the link between activity and evolutionary stage is rather loose.
(5) By analysing a control sample of IR-luminous galaxies around z ∼ 1, we find evidence for only minor changes with redshift of the large-scale spectral properties of the AGN and SB components. This underlines the potential of our method as a straightforward and quantitative AGN/SB diagnostic tool for ULIRG-like systems at high redshift as well, and hints to possible photometric variants for fainter sources.
Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS
Journal keyword(s): galaxies: active - galaxies: starburst - infrared: galaxies
VizieR on-line data: <Available at CDS (J/MNRAS/405/2505): table1.dat table3.dat pid.dat refs.dat>
Simbad objects: 239
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