1999/09/20 by A. V. Moiseev, А. В. Моисеев, Moiseev, A. V.
Physics and Astronomy · #Astrophysics (astro-ph) #Astrophysics and Star Formation Studies #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9909341
9 pages, 7-PS figures, Accepted to A&A, added 3 new figures and Comments
openalex publication_date 1999/09/20 · arxiv created 2000/09/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The results of Hα and [NII]λ6583 observations of the spiral galaxy NGC 1084 at the SAO 6m telescope with a Fabry-Perot interferometer are presented. The complex structure of the emission line profile has revealed the presence of giant star formation regions (``spur'') in the NE part of the galaxy. In this region the Hα line shows two distinct components, with line-of-sight velocity differences of ±(100-150)\km. The first component corresponds to normal circular rotation. The second velocity component may be a signature of non-circular motions of the ionized gas in shock wave fronts. An increase of the [NII]/Hα line ratio confirms the shock wave interpretation of these features. The ionized gas kinematics in this galaxy is discussed.