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| Paper: |
AGNs and Environment: AGN Population and Deficiency of BLAGNs in Compact Groups of Galaxies |
| Volume: |
427, Accretion and Ejection in AGN: a Global View |
| Page: |
349 |
| Authors: |
del Olmo, A.; Martí nez, M. A.; Perea, J.; Coziol, R.; Focardi, P. |
| Abstract: |
To explore the connection between AGN activity and
environment in the nearby Universe, we have carried out a
spectroscopic study to determine the frequency and nature of the
nuclear activity in two well-defined samples of compact groups (CGs)
of galaxies: Hickson Compact Groups and Updated Zwicky Catalogue of
Compact Groups. We found that a large fraction of the member-galaxies,
63% of the HCG galaxies and 67% of the UZC-CG galaxies, show
emission lines. From them, low luminosity AGN is the most frequent
activity type found in Compact Groups. Only 8 BLAGNs have been
detected, showing a clear deficiency of broad line AGNs that must be
related to the compact group environment, where galaxies suffer slow
encounters and morphological transformations that result in an
important decrease of the total content of gas. |
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