26 citations · 119 across the 12 of their papers we have counts for
9 papers · 1 filter
On the Formation and Evolution of cD Galaxies
Hrant Tovmassian
The cannibalism mechanism of formation of cD galaxies in clusters of Bautz-Morgan class I is analyzed. Dependences between absolute magnitude of cD galaxies, and of the clusters in…
Properties of Hickson Compact Groups and of the Loose Groups within which they are Embedded
H. Tovmassian, M. Plionis, J. P. Torres-Papaqui
We use the Sloan Digital Sky Survey (SDSS) redshift catalogue to look for galaxies with accordant redshifts in the nearby environment (up to ~2 Mpc) of 15 Hickson Compact Groups (H…
Morphological and Luminosity Content of Poor Galaxy Groups
H. Tovmassian, M. Plionis, H. Andernach
We find that the fraction of early-type galaxies in poor groups (containing from 4 to 10 members) is a weakly increasing function of the number of the group members and is about tw…
On the Xray Luminosity - velocity dispersion relation of groups of galaxies
M. Plionis, H. Tovmassian
We analyse the Lx-sigma relation for the new Mulchaey et al. group Atlas. We find that once we take into account the possible statistical bias introduced by the cutoff in luminosit…
Shakhbazian compact galaxy groups. II. Photometric and spectroscopic study of ShCG 376
Hrant M. Tovmassian, H. Tiersch, V. H. Chavushyan +1
The results of the redshift measurements and of the detailed surface photometry in BVR of the compact group ShCG 376 are presented. The radial velocity dispersion, the virial mass,…
Do clusters of galaxies rotate?
Hrant M. Tovmassian
It is shown that the number of members, , and the linear radius of the Abell clusters at increase with redshift. The increase is caused by observational selection: th…
Dynamics of HCGs
H. M. Tovmassian, V. Chavushian, O. Martinez +2
It is shown that compact groups of galaxies (HCGs, ShCGS) are stable formations, in which principal member galaxies together with faint galaxies in their environment rotate in elon…
On the X-ray emission of the low-mass galaxy groups
H. M. Tovmassian, O. Yam, H. Tiersch
It is shown that the low-mass groups obey the law deduced for galaxy clusters. The impression of the more shallow slope of the correlation for groups…
Spectral Observations of Faint Markarian Galaxies of the Second Byurakan Survey. II
L. Carrasco, H. M. Tovmassian, J. A. Stepanian +3
We continue the program of spectroscopic observations of objects from the Second Byurakan Survey (SBS). This survey contains more than 1300 galaxies and 1700 star-like objects with…