Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012astbu..67...17k&link_type=abstract
Astrophysical Bulletin, Volume 67, Issue 1, pp.17-28
Astronomy and Astrophysics
Astrophysics
Galaxies: Clusters: Individual: A1569
Scientific paper
We report the results of study of the A1569 cluster (12 h 36m.3, +16°35') and the neighboring A1589 cluster (12 h 41m.3, +18°34'), making up a pair (a supercluster) with a projected size of about 10Mpc. This study is done within the framework of our program for investigating the galaxy clusters with bimodal velocity distributions (i.e., clusters where the velocities of subsystems differ by more than Δ cz ˜ 3000 km/s). In the A1569 cluster we have identified two subsystems: A1569A ( cz = 20613 km/s) and A1569B ( cz = 23783 km/s). These subsystems have the line-of-sight velocity dispersions of 484 km/s and 493 km/s, and dynamic masses within the R 200 radius equal to 1.8 × 1014 and 2.0 × 1014 M &sun;, respectively. We directly estimate the distances to these subsystems using three methods applied to earlytype galaxies: the Kormendy relation, photometric plane, and fundamental plane. To this end, we use the results of our observations made with the 1-m telescope of the SAO RAS and the data adopted from the SDSS DR7 catalog. We found that A1569 consists of two independent clusters. The A1569B cluster is located at the Hubble distance corresponding to its radial velocity. The A1569A cluster has a peculiar velocity of -1290 ± 630 km/s, which can be explained by the effect of the more massive A1589 cluster (with a mass of 7.9 × 1014 M &sun;) and of the supercluster where it resides. In all the four bimodal clusters that we studied within the framework of our program, A1035, A1775, A1831, and A1569, the subsystems are independent clusters lying close to the Hubble relation between redshift and distance.
Kopylov Alexander I.
Kopylova Flera G.
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