The kinematics of the warm gas in Hickson compact group of galaxies HCG 90

Abstract

We present kinematic observations of H$\alpha$ emission for two early-type galaxies and one disk system, members of the Hickson compact group 90 (HCG 90) obtained with a scanning Fabry-Perot interferometer and samplings of 16 $km$ $s^{-1}$ and 1$\arcsec$. Mapping of the gas kinematics was possible to $\sim$ 2 r${}_{eff}$ for the disk galaxy N7174 and to $\sim$ 1.3 r${}_{eff}$ and $\sim$ 1.7 r${}_{eff}$ for the early-type galaxies N7176 and N7173 respectively. Evidence for ongoing interaction was found in the properties of the warm gas of the three galaxies, some of which do not have stellar counterparts. We suggest the following evolutionary scenario for the system. H90d is the warm gas reservoir of the group in process of fueling H90b with gas. H90c and d have experienced past interaction with gas exchange. The gas acquired by H90c has already settled and relaxed but the effects of the interaction can still be visible in the morphology of the two galaxies and their stellar kinematics. This process will possibly result in a major merger.

32 pages - 10 figures, Accepted for publication in Astronomical Journal

References in corpus (4)

• The Properties of Poor Groups of Galaxies: I. Spectroscopic Survey and Results
• The Properties of Poor Groups of Galaxies: II. X-ray and Optical Comparisons
• Effects of Interaction Induced Activities in Hickson Compact Groups: CO and FIR Study
• The Nature of the Activity in Hickson Compact Groups of Galaxies

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• H_αLuminosity and Star Formation of Galaxies in HCGs
• The Occurrence of Compact Groups of Galaxies Through Cosmic Time
• Globular Cluster Population of Hickson Compact Group 22a and 90c
• Cosmic Pathways for Compact Groups in the Milli-Millennium Simulation
• MeerKAT view of Hickson Compact Groups:I. Data description and release