GAVAZZI G., MARCELIN M., BOSELLI A., AMRAM P., VILCHEZ J.M., IGLESIAS-PARAMO J. and TARENGHI M.
Abstract (from CDS):
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 Hα frame. Long-slit spectroscopy shows a 500km/s rigid-body rotation curve with a sudden central velocity jump, of more than 200km/s amplitude. Fabry-Perot observations of the Hα 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.
galaxies: individual: UGC 6697 - galaxies: interactions - kinematics and dynamics