Volume 377, Number 3, October III 2001
|Page(s)||745 - 758|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 October 2001|
The velocity field of UGC 6697 revisited*
Università degli Studi di Milano -Bicocca, P.zza delle scienze 3, 20126 Milano, Italy
2 Laboratoire d'Astrophysique de Marseille, 2 place Le Verrier, 13248 Marseille Cedex 4, France
3 Instituto de Astrofísica de Andalucía, CSIC, Apdo. 3004, 18080, Granada, Spain
4 European Southern Observatory, K. Schwarzschild Str. 2, 857448, Garching bei Muenchen, Germany
Corresponding author: G. Gavazzi, Giuseppe.Gavazzi@mib.infn.it
Accepted: 5 July 2001
The edge-on galaxy UGC 6697 has a peculiar morphological appearance: a high surface brightness SE component and what appears to be a tidal tail with blue color and low surface brightness extending toward the NW, as dramatically evidenced in subarcsecond broad band images taken with the VLT and in a deep frame. Long-slit spectroscopy shows a 500 km s-1 rigid-body rotation curve with a sudden central velocity jump, of more than 200 km s-1 amplitude. Fabry-Perot observations of the emission line enable us to trace a detailed 2D velocity field, confirming the complex kinematical behaviour, particularly in the circumnuclear region where multiple velocity components are clearly superposed on the same line of sight. This region hosts a double nucleus and shows sudden color and metallicity gradients, which can be reconciled with the complex velocity field assuming the presence of a second galaxy hidden behind the main body of UGC 6697.
Key words: galaxies: individual: UGC 6697 / galaxies: interactions / galaxies: kinematics and dynamics
© ESO, 2001
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