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2007MNRAS.376..416R - Mon. Not. R. Astron. Soc., 376, 416-434 (2007/March-3)
Hidden activity in high-redshift spheroidal galaxies from mid-infrared and X-ray observations in the GOODS-North field.
RODIGHIERO G., GRUPPIONI C., CIVANO F., COMASTRI A., FRANCESCHINI A., MIGNOLI M., FRITZ J., VIGNALI C. and TREU T.
Abstract (from CDS):
When the available independent diagnostics are compared, in general, they provide consistent classifications about the nature of the activity in our spheroidal population. Given that, in principle, none of these diagnostics alone can be considered as conclusive, only trough a panchromatic comparison of them, we can reach an accurate comprehension of the underlying physical processes. In particular, our multiwavelength analysis of the X-ray and MIR properties leads us to conclude that at least eight of the 19 24-µm bright sources should hide an obscured AGN, while the X-ray undetected sources are more likely dominated by star formation. We conclude that ∼30 objects (∼20 per cent) of the original flux-limited sample of 168 spheroidal galaxies in the GOODS-North are detected during phases of prominent activity, of both stellar and quasar origin. Due to the short expected lifetimes of the infrared and X-ray emissions, this fraction might imply a significant level of activity in this class of galaxies during the relatively recent cosmic epochs - z ∼ 0.3-1 - under investigation.
Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s): galaxies: active - galaxies: elliptical and lenticular, cD - galaxies: high-redshift - infrared: galaxies
Nomenclature: Fig.1, Tables 1, 3: [RGC2007] NN N=19 among (Nos 0-20), [RGC2007] NNx (Nos 1x-14x).
Simbad objects: 37
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