NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T13:08:16 PDT
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For refcode 2005A&A...440...73C:
Retrieve 65 NED objects in this reference.
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2005A&A...440...73C The host galaxy/AGN connection in nearby early-type galaxies Sample selection and hosts brightness profiles A. Capetti and B. Balmaverde Received 22 March 2005 / Accepted 27 April 2005 This is the first of a series of three papers exploring theconnection between the multiwavelength properties of AGNs in nearby early-type galaxiesand 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. Keywords: galaxies: active, galaxies: bulges, galaxies: elliptical and lenticular, cD, galaxies: nuclei, galaxies: structure
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