Morphology of Markarian galaxies in single galaxies and groups

Abstract

The morphological content of Markarian galaxies (MG) in groups and in single galaxies is examined. It is found that MG do not conform to the long established rule that the relative number of elliptical and lenticular galaxies in groups is higher than in single galaxies.The relationship of high surface brightness Arakelian galaxies to their environment was studied in Ref. 1. In particular, it was found that these galaxies do not conform to the well established rule according to which elliptical and lenticular galaxies are encountered more often in groups of galaxies than among single galaxies. In this note we obtain analogous statistics for Markarian galaxies with an ultraviolet continuum.We use the same sample [2] as in Ref. 1 for the list of groups of galaxies.Here we discuss the morphological distribution of Markarian galaxies which are members of groups and those which are single. Since the number of Markarian galaxies of known morphological types in the CfA2 catalog is small, we divide the galaxies into two parts with respect to their morphological type: elliptical (elliptical and lenticular) and spiral.In order to reduce the effect on the results owing to differences in the distributions of the visible stellar magnitudes, as well to differences in the mean distances of the samples, we impose limits on the stellar magnitudes (m = 13-15) and radial velocities (V = 2000-8000 km/s) of the samples of galaxies to be compared.

Luminosity Function of Arakelian Galaxies and Their Environmental Dependences

“…This is slightly higher than the similar value obtained in [4] (2.05%). This is due to the fact that in [4] the samples are limited by the apparent magnitude and do not take into account the distribution of absolute stellar magnitudes.…”

“…The author of [27] ation is also s tend to rest der to evalua d in [28]. The maximum l Bell method ( ntrast to [27] homogeneity that the three rk [28] To identify groups of galaxies, the method proposed in [34,35] was used. According to this method, an arbitrary galaxy is first selected from a list bounded by the apparent magnitude and with full radial velocity data, and then neighbors are searched for in its vicinity by the following criteria: k -are coefficients depending on the morphological types of galaxies: [34,35], we showed that when using the neighborhood criterion (7) and 8, there is no need to change the parameters 0 E and 0 V with distance (in order to take into account changes in the observed luminosity function of galaxies).…”

“…We use the same sample of groups and ArG as in [4]. The groups of galaxies are used as groups [35], identified on the basis of the CfA2 redshift survey (http://vizier.cfa.harvard.edu/viz-bin/VizieR?-source=VII/256).…”

“…In [4], the connection between Arakelian galaxies of high surface brightness and their environment was studied. In particular, it has been found that Arakelian galaxies (ArG) which are members of groups have higher luminosities than single ones on average.…”

Dependences between the magnitude gap of groups and the morphology of two brightest galaxies

“…Sample. We have used the list of groups of galaxies suggested by Mahtessian, Movsessian (2010). The study area is limited to the following: 1000 km/s ≤ V ≤ 15000 km/s, |bII| ≤ 3.…”