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Nuclear Activity in the Hickson Compact Groups of Galaxies

Published online by Cambridge University Press:  25 May 2016

M. Shimada ,
S. Nishiura ,
Y. Ohyama ,
T. Murayama  and
Y. Taniguchi
M. Shimada
Affiliation:
Astronomical Institute, Tohoku University, Aramaki, Aoba, Sendai 980-77, JAPAN
S. Nishiura
Affiliation:
Astronomical Institute, Tohoku University, Aramaki, Aoba, Sendai 980-77, JAPAN
Y. Ohyama
Affiliation:
Astronomical Institute, Tohoku University, Aramaki, Aoba, Sendai 980-77, JAPAN
T. Murayama
Affiliation:
Astronomical Institute, Tohoku University, Aramaki, Aoba, Sendai 980-77, JAPAN
Y. Taniguchi
Affiliation:
Astronomical Institute, Tohoku University, Aramaki, Aoba, Sendai 980-77, JAPAN

Extract

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In order to study environmental effects on the nuclear activity in galaxies, we have been conducting a spectroscopic study of Hickson Compact Groups of galaxies (HCGs, Hickson 1982) which are the densest agglomeration of galaxies. We obtained nuclear spectra of 62 galaxies in 29 HCGs in the spectral range 6200–7000Å with the 188cm telescope at Okayama Astrophysical Observatory. These spectra were classified into the three types by using the emission line ratio [NII]λ6583/Hα; (1) AGN: [NII]λ6583/Hα >0.6, (2) HII nuclei: [NII]λ6583/Hα <0.6, and (3) Absorption: no emission line. We compared the nuclear activity of galaxies in HCGs with that of nearby galaxies (Ho 1996; Ho, Filippenko & Sargent 1997) which provides a representative sample of field galaxies. In early-type spirals (Sa-Sbc), the fraction of HII nuclei in HCGs is smaller than that in the field galaxies, while the fraction of absorption in HCGs is larger than that in field galaxies. On the other hand, in early-type galaxies (E-S0a) and late-type spirals (Sc-P), we found little difference in the nuclear activity between HCGs and field galaxies.

Type
Groups & Clusters
Information
Symposium - International Astronomical Union , Volume 186: Galaxy Interactions at High and Low Redshift , 1999 , pp. 418
Copyright
Copyright © Kluwer 1999 

References

Hickson, P. 1982, ApJ, 255, 382 Google Scholar
Ho, L.C. 1996, in The Physics of LINERS in View of Recent Observations, ASP Conf. Ser., 103, 103 Google Scholar
Ho, L.C., Filippenko, A.V., & Sargent, W.L.W. 1997, ApJ, 487, 568 Google Scholar