NGC 7468: a galaxy with an inner polar disk

Abstract

We present our spectroscopic observations of the galaxy NGC 7468 performed at the 6-m Special Astrophysical Observatory telescope using the UAGS long-slit spectrograph, the multipupil fiber spectrograph MPFS, and the scanning Fabry-Perot interferometer (IFP). We found no significant deviations from the circular rotation of the galactic disk in the velocity field in the regions of brightness excess along the major axis of the galaxy (the putative polar ring). Thus, these features are either tidal structures or weakly developed spiral arms. However, we detected a gaseous disk at the center of the galaxy whose rotation plane is almost perpendicular to the plane of the galactic disk. The central collision of NGC 7468 with a gas-rich dwarf galaxy and their subsequent merging seem to be responsible for the formation of this disk.

8 pages, 6 figures, accepted in Astronomy Letters, 2004, vol 30., N 9, p. 583

References in corpus (3)

• New light on the search for low metallicity galaxies I. The N2 method
• Formation of polar ring galaxies
• A Neutral Hydrogen Survey of Polar-Ring Galaxies: I. Green Bank Observations of the Northern Sample

Cited by in corpus (10)

• Integral Field Spectroscopy of Blue Compact Dwarf Galaxies
• Two more disk galaxies with global gas counterrotation
• On the Nature of the Apparent Ring Galaxy SDSS J075234.33+292049.8
• Mapping Luminous Blue Compact Galaxies with VIRUS-P: morphology, line ratios and kinematics
• Scanning Fabry--Perot Interferometer of the 6-m SAO RAS Telescope
• Inner Polar Rings and Disks: Observed Properties
• 3D spectroscopic study of galactic rings: formation and kinematics
• Astrophysics in 2005
• Kinematically detected polar rings/disks in blue compact dwarf galaxies
• Internal Kinematics of Galaxies: 3D Spectroscopy on Russian 6m Telescope