Study of the structure and kinematics of the NGC 7465/64/63 triplet galaxies

• Published in: Astronomy letters Vol. 38; no. 5; pp. 290 - 304
• Main Authors: Merkulova, O. A., Karataeva, G. M., Yakovleva, V. A., Burenkov, A. N.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01-05-2012; Springer Nature B.V
• Subjects: Astronomy; Astrophysics; Astrophysics and Astroparticles; Galaxies; Kinematics; Observations and Techniques; Physics; Physics and Astronomy; Spectrum analysis; Stars & galaxies; galaxies; interacting galaxies — kinematics; groups of galaxies; structure
• ISSN: 1063-7737; 1562-6873
• DOI: 10.1134/S1063773712050052

We analyze new observational data obtained at the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences with the multimode SCORPIO instrument and the Multi-Pupil Fiber Spectrograph for the group of galaxies NGC 7465/64/63. For one of the group members (NGC 7465), the presence of a polar ring has been suspected. We have constructed the large-scale brightness distributions, the ionized-gas velocity and velocity dispersion fields for all three galaxies as well as the line-of-sight velocity curves based on emission and absorption lines and the stellar velocity field in the central region for NGC 7465. As a result of our analysis of the data obtained, we have discovered an inner stellar disk (
r
≈ 0.5 kpc) and a warped gaseous disk in NGC 7465, in addition to the main stellar disk. Based on a joint study of our photometric and spectroscopic data, we have established that NGC 7464 is an irregular IrrI-type galaxy whose structural and kinematic peculiarities most likely resulted from its gravitational interaction with NGC 7465. The velocity field of the ionized gas in NGC 7463 turns out to be typical of barred spiral galaxies, and the warp of the outer parts of its disk could arise from a close encounter with one of the galaxies of the environment.