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26 April 2024 |
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The Compact Group of Galaxies HCG 31 is in an early phase of merging | | P. Amram
; C. Mendes de Oliveira
; H. Plana
; C. Balkowski et al
; | | Date: |
26 Jul 2004 | | Journal: | Astrophys.J. 612 (2004) L5-L8 | | Subject: | astro-ph | | Affiliation: | LAM-Marseille), C. Mendes de Oliveira (IAG/USP), H. Plana (LATO - UESC), C. Balkowski (GEPI-Meudon | | Abstract: | 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. | | Source: | arXiv, astro-ph/0407525 | | Services: | Forum | Review | PDF | Favorites | |
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