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A new sample of large angular size radio galaxies : III. Statistics and evolution of the grown population

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A new sample of large angular size radio galaxies : III. Statistics and evolution of the grown population

dc.contributor.author	Lara, L.
dc.contributor.author	Giovannini, G.
dc.contributor.author	Cotton, W.D.
dc.contributor.author	Feretti, L.
dc.contributor.author	Marcaide Osoro, Juan María
dc.contributor.author	Márquez, I.
dc.contributor.author	Venturi, T.
dc.date.accessioned	2010-06-29T11:05:02Z
dc.date.available	2010-06-29T11:05:02Z
dc.date.issued	2004
dc.identifier.citation	LARA, L. ; Giovannini, G. ; Cotton, W.D. ; Feretti, L. ; Marcaide Osoro, Juan María ; Márquez, I. ; Venturi, T., 2004, A new sample of large angular size radio galaxies : III. Statistics and evolution of the grown population, Astronomy and Astrophysics, vol. 421, no. 3, p. 899-911	en
dc.identifier.uri	http://hdl.handle.net/10550/14015
dc.description.abstract	We present in this paper a detailed study of a new sample of large angular size FR I and FR II radio galaxies and compare the properties of the two classes. As expected, a pure morphology based distinction of FR Is and FR IIs corresponds to a break in total radio power. The radio cores in FR Is are also weaker than in FR IIs, although there is not a well defined break power. We find that asymmetry in the structure of the sample members must be the consequence of anisotropies in the medium where the lobes expand, with orientation playing a minor role. Moreover, literature data and our observations at kiloparsec scales suggest that the large differences between the structures of FR I and FR II radio galaxies must arise from the poorly known central kiloparsec region of their host galaxies. We analyze the sub-sample of giant radio galaxies, and do not find evidence that these large objects require higher core powers. Our results are consistent with giant radio galaxies being the older population of normal FR I and FR II objects evolving in low density environments. Comparing results from our sample with predictions from the radio luminosity function we find no evidence of a possible FR II to FR I evolution. Moreover, we conclude that at z ∼ 0.1, one out of four FR II radio sources has a linear size above 500 kpc, thus being in an advanced stage of evolution (for example, older than ∼10 Myr assuming a jet-head velocity of 0.1c). Radio activity seems to be a short-lived process in active galaxies, although in some cases recurrent: five objects in our sample present signs of reactivation in their radio structures.	en
dc.language.iso	en	en
dc.subject	Active galaxies ; Nuclei Jets ; Radio continuum	en
dc.title	A new sample of large angular size radio galaxies : III. Statistics and evolution of the grown population	en
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA	en
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia	en
dc.identifier.doi	10.1051/0004-6361:20035676	en
dc.identifier.idgrec	016799	en
dc.type.hasVersion	VoR	es_ES
dc.identifier.url	http://www.aanda.org/articles/aa/pdf/2004/27/aa0676.pdf	en