Active galactic nuclei and galaxy interactions

M. Sol Alonso, Diego G. Lambas, Patricia Tissera, Georgina Coldwell

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

85 Citas (Scopus)


We perform a statistical analysis of active galactic nucleus (AGN) host characteristics and nuclear activity for AGNs in pairs and without companions. Our study concerns a sample of AGNs derived from the Sloan Digital Sky Survey Data Release 4 data by Kauffmann et al. and pair galaxies obtained from the same data set by Alonso et al. An eye-ball classification of images of 1607 close pairs (rp < 25 kpc h-1, Δ V < 350 km s -1) according to the evidence of interaction through distorted morphologies and tidal features provides us with a more confident assessment of galaxy interactions from this sample. We notice that, at a given luminosity or stellar mass content, the fraction of AGNs is larger for pair galaxies exhibiting evidence for strong interaction and tidal features which also show signs of strong star formation activity. Nevertheless, this process accounts only for a ̃10 per cent increase of the fraction of AGNs. As in previous works, we find AGN hosts to be redder and with a larger concentration morphological index than non-AGN galaxies. This effect does not depend on whether AGN hosts are in pairs or in isolation. The O III luminosity of AGNs with strong interaction features is found to be significantly larger than that of other AGNs, either in pairs or in isolation. Estimations of the accretion rate, L[O III]/MBH, show that AGNs in merging pairs are actively feeding their black holes, regardless of their stellar masses. We also find that the luminosity of the companion galaxy seems to be a key parameter in the determination of the black hole activity. At a given host luminosity, both the O III luminosity and the L[O III]/MBH are significantly larger in AGNs with a bright companion (Mr < -20) than otherwise.

Idioma originalInglés
Páginas (desde-hasta)1017-1024
Número de páginas8
PublicaciónMonthly Notices of the Royal Astronomical Society
EstadoPublicada - mar 2007

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Ciencias planetarias y espacial


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