Hrant M. Tovmassian1 and H. Tiersch2
1 Instituto Nacional de Astrofísica Óptica y Electrónica INAOE, Apdo. Postal 51 y 216, C.P. 72000, Puebla, Puebla, México (hrant@inaoep.mx)
2 Sternwarte Königsleiten, 81477, München, Leimbachstr. 1a, Germany (htiersch@uni.de)
Received 2007 October 24
Accepted 2007 December 11
]]> RESUMEN
En este artículo presentamos los resultados de un detallado estudio espectroscópico y fotométrico de siete grupos compactos de Shakhbazian (ShCGs), ShCG 285, ShCG 289, ShCG 322, ShCG 323, ShCG 327, ShCG 330, and ShCG 346. Determinamos el corrimiento al rojo de las galaxias miembros y las dispersiones de velocidad radial de los grupos. También estudiamos la distribución del brillo superficial de las galaxias miembros en la banda R y determinamos sus tipos morfológicos. Encontramos, como en otros ShCGs estudiados anteriormente, que algunos miembros de los grupos son galaxias en interacción o incluso están en proceso de fusión. Determinamos los parámetros físicos de los grupos: masas viriales, luminosidades, cocientes de masa–luminosidad y tiempos de cruce. Sobre la base de los resultados obtenidos en este y en trabajos anteriores, se discuten las propiedades generales de 37 ShCGs. Se muestra que alrededor del 75% de las galaxias miembros son de los tipos morfológicos E y S0.
ABSTRACT
The results of the detailed spectroscopic and photometric study of seven Shakhbazian compact groups: ShCG 285, ShCG 289, ShCG 322, ShCG 323, ShCG 327, ShCG 330, and ShCG 346, are presented. We determined redshifts of member galaxies and radial velocity dispersions of groups. We studied also the distribution of the surface brightness of member galaxies in R and determined their morphological types. We found that, as in previously studied ShCGs, some group members are interacting or are even in the process of merging. We determined physical parameters of groups: virial masses, luminosities, mass–to–luminosity ratios, and the crossing times. On the basis of the results obtained in this and our previous works, the general properties of 37 ShCGs are discussed. It is shown that about 75% of member galaxies are of E and S0 type.
Key Words: galaxies: clusters: individual (ShCG 285, ShCG 289, ShCG 322, ShCG 323, ShCG 327, ShCG 330, ShCG 346) — galaxies: photometry — galaxies: distances and redshifts — galaxies: interactions
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Acknowledgement
]]> We are grateful to our anonymous referee for a very careful reading of the manuscript and many comments. H. Tiersch is grateful to the Government of the Land Brandenburg for the support of this work (Az 24–19/003; 2000), to the DFG for Grants TI 215/6–2, TI 215/6–3, MEX 111/1/98, and to Mr. O. Beck for private financial support.
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