期刊
ASTRONOMY & ASTROPHYSICS
卷 440, 期 1, 页码 73-U50出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20053113
关键词
galaxies : active; galaxies : bulges; galaxies : elliptical and lenticular, cD; galaxies : nuclei; galaxies : structure
This is the first of a series of three papers exploring the connection between the multiwavelength properties of AGNs in nearby early-type galaxies and the characteristics of their hosts. We selected two samples, both with high resolution 5 GHz VLA observations available and providing measurements down to 1 mJy level, reaching radio-luminosities as low as 10(19) W Hz(-1). We focus on the 116 radio-detected galaxies as to boost the fraction of AGN with respect to a purely optically selected sample. Here we present the analysis of the optical brightness profiles based on archival HST images, available for 65 objects. We separate early-type galaxies on the basis of the slope of their nuclear brightness profiles, into core and power-law galaxies following the Nuker's scheme, rather than on the traditional morphological classification (i.e. into E and S0 galaxies). Our sample of AGN candidates is indistinguishable, when their brightness profiles are concerned, from galaxies of similar optical luminosity but hosting weaker ( or no) radio-sources. We confirm previous findings that relatively bright radio-sources (L-r > 10(21.5) W Hz(-1)) are uniquely associated to core galaxies. However, below this threshold in radio-luminosity core and power- law galaxies coexist and they do not show any apparent difference in their radio-properties. Not surprisingly, since our sample is deliberately biased to favour the inclusion of active galaxies, we found a higher fraction of optically nucleated galaxies. Addressing the multiwavelength properties of these nuclei will be the aim of the two forthcoming papers.
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