Shakhbazian compact galaxy groups

Abstract

Abstract. Shakhbazian compact galaxy groups belong to the interesting class of compact groups. Because of their large number (the catalogue contains 377 entries) we are able to study the groups in different stages of evolution. Here we give the results of detailed study of four groups, ShCG 154, ShCG 166, ShCG 328 and ShCG 360. We present the redshifts of individual galaxies in groups, the results of the surface photometry in BVR, the contourplots of the surface brightness versus effective radius of galaxies, the twisting postion angle versus effective radius of galaxies, the radial velocity dispersions, the crossing times, the mass-to-luminosity ratios of groups and the results of the X-ray study. The dynamical state of groups, interactions between member galaxies, and the physical parameters of groups are discussed.

Spectroscopy and photometry of ShCG 191 - Abell 1097

“…In Table 2 the following information is given: line 1 -the redshift z (weighted by masses of member galaxies); line 2 -the diameter D of the cluster (H o = 70 km s −1 Mpc −1 ); line 3 -the radial velocity dispersion RVD (weighted by the masses of galaxies); line 4 -the virial radius R vir (weighted by the masses of galaxies); line 5 -the virial mass M vir ; line 6 -the luminosity L of the cluster in solar units; line 7 -the mass-to-luminosity ratio M/L in solar units; and line 8 -the crossing time τ c . For details of determination of the above mentioned parameters see Tiersch et al (2002). Table 2.…”

“…Since the images of some members are very compact, sometimes it is very difficult to differ them from those of stars. However, follow-up detailed study of ShCGs showed that the overhelming majority of objects in these groups are indeed galaxies (Tiersch et al 2002;Tovmassian et al 2003aTovmassian et al , 2003bTovmassian et al , 2004Tovmassian et al , 2005aTovmassian et al , 2005b. Oleak et al (1995) showed that these groups have a "cigar"-like prolate spheroid space configuration.…”

Shakhbazian compact galaxy groups

“…About two dozen ShCGs have been observed spectroscopically (Robinson & Wampler 1973;Arp et al 1973;Mirzoyan et al 1975;Kirshner & Malamuth 1980;Amirkhanian 1989;Kodaira et al 1988Kodaira et al , 1990Kodaira & Sekiguchi 1991;Lynds et al 1990;del Olmo & Moles 1991). A few years ago we commenced a spectroscopic and photometric study of a large number of ShCGs (Tiersch et al 1995a(Tiersch et al , 1995b(Tiersch et al , 1996a(Tiersch et al , 1996b(Tiersch et al , 1999a. The number of the spectroscopically observed groups reaches at present about 100.…”

Photometric observations of nine Shakhbazian compact groups

“…A large number of interacting galaxies are detected among ShCG members [14,[15][16][17][18][19][20][21][22][23]. A large number of interacting galaxies are detected among ShCG members [14,[15][16][17][18][19][20][21][22][23].…”