Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-07-26
Astrophys.J. 612 (2004) L5-L8
Astronomy and Astrophysics
Astrophysics
5 pages + figures - Accepted to ApJ Letter
Scientific paper
10.1086/424482
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 $A2$ and E, to the east and south of complex A+C, present rotation patterns with velocity amplitudes of $\sim 25 km s^{-1}$ 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 $A1$. 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.
Amram Ph.
Balkowski Ch.
de Oliveira Mendes Cl.
Plana Henri
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