The velocity field of UGC 6697 revisited
Authors: Amram, P.; Gavazzi, G.; Marcelin, M.; Boselli, A.; VÍlchez, J.M.; Iglesias-Paramo, J.; Tarenghi, M.
Source: Astrophysics and Space Science, Volume 281, Numbers 1-2, July 2002 , pp. 401-404(4)
Abstract: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 500 km/s rigid-body rotation curve with a sudden central velocity jump, of more than 200 km/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.
Document Type: Research Article
Affiliations: Email: Amram@Observatoire.cnrs-mrs.fr
Publication date: July 1, 2002