The compact group of galaxies hcg 31 is in an early phase of merging
Jul, 20045 pages
Published in:
- Astrophys.J.Lett. 612 (2004) L5-L8
e-Print:
- astro-ph/0407525 [astro-ph]
DOI:
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Abstract: (arXiv)
We have obtained high spectral resolution (R = 45900) Fabry-Perot velocity maps of the Hickson Compact Group HCG 31 in order to revisit the important problem of the merger nature of the central object A+C and to derive the internal kinematics of the candidate tidal dwarf galaxies in this group. Our main findings are: (1) double kinematic components are present throughout the main body of A+C, which strongly suggests that this complex is an ongoing merger (2) regions and E, to the east and south of complex A+C, present rotation patterns with velocity amplitudes of and they counterrotate with respect to A+C, (3) region F, which was previously thought to be the best example of a tidal dwarf galaxy in HCG 31, presents no rotation and negligible internal velocity dispersion, as is also the case for region . HCG 31 presents an undergoing merger in its center (A+C) and it is likely that it has suffered additional perturbations due to interactions with the nearby galaxies B, G and Q.- galaxies: clusters: individual (HCG 31)
- galaxies: evolution
- galaxies: formation
- galaxies: interactions
- galaxies: kinematics and dynamics
- instrumentation: interferometers
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