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Date and Time of the Query: 2019-06-17 T10:05:30 PDT
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For refcode 2003AJ....126.2635M:
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Copyright by American Astronomical Society. Reproduced by permission
2003AJ....126.2635M Dynamical Effects of Interactions and the Tully-Fisher Relation for Hickson Compact Groups C. Mendes de Oliveira, P. Amram, H. Plana, and C. Balkowski Abstract. We investigate the properties of the B-band Tully-Fisher (T-F) relation for 25 compact group galaxies, using V_max_ derived from two-dimensional velocity maps. Our main result is that the majority of the Hickson Compact Group galaxies lie on the T-F relation. However, about 20% of the galaxies, including the lowest-mass systems, have higher B luminosities for a given mass, or alternatively, a mass that is too low for their luminosities. We favor a scenario in which outliers have been brightened because of either enhanced star formation or merging. Alternatively, the T-F outliers may have undergone truncation of their dark halo due to interactions. It is possible that in some cases both effects contribute. The fact that the B-band T-F relation is similar for compact group and field galaxies tells us that these galaxies show common mass-to-size relations and that the halos of compact group galaxies have not been significantly stripped inside R_25_. We find that 75% of the compact group galaxies studied (22 out of 29) have highly peculiar velocity fields. Nevertheless, a careful choice of inclination, position angle, and center, obtained from the velocity field, and an average of the velocities over a large sector of the galaxy enabled the determination of fairly well-behaved rotation curves for the galaxies. However, two of the compact group galaxies HCG 91a and HCG 96a, which are the most massive members in M51-like pairs, have very asymmetric rotation curves, with one arm rising and the other one falling, indicating most probably a recent perturbation by the small close companions. Keywords: Galaxies: Interactions, Galaxies: ISM, Galaxies: Kinematics and Dynamics, Instrumentation: Interferometers, Galaxies: Intergalactic Medium
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