| Issue |
A&A
Volume 377, Number 3, October III 2001
|
|
|---|---|---|
| Page(s) | 745 - 758 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20010991 | |
| Published online | 15 October 2001 | |
The velocity field of UGC 6697 revisited*
1
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
Received:
21
December
2000
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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