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Nuclear Activity in UZC Compact Groups of Galaxies

Authors
  • Martinez, M. A.
  • del Olmo, A.
  • Focardi, P.
  • Perea, J.
Type
Preprint
Publication Date
Nov 02, 2006
Submission Date
Nov 02, 2006
Identifiers
arXiv ID: astro-ph/0611099
Source
arXiv
License
Unknown
External links

Abstract

We analyse the level of nuclear activity in galaxies belonging to UZC-CGs. Spectra are available for 868 galaxies (90% of the whole catalog); 67 % of them show nuclear activity (AGN or Star formation). To carry out a detailed study about the nuclear activity and its relationship with properties of the host galaxy and parent group we select a sample of 215 groups with spectra available for all their members. From the analysis of this sample and using diagnostic diagrams to do the nuclear classification we found that 37% of emission galaxies host an HII nuclear region, 43% an AGN and 20% a Transition Object. AGNs are located mainly in bright early type galaxies meanwhile HII are in fainter and later types. Groups dominated by HII show significant lower velocity dispersions and larger sizes than groups dominated by AGNs or TO.

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