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Astron. Astrophys. 363, 843-850 (2000)

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Strong non-circular motions of gas in the spiral galaxy NGC 1084 *

A.V. Moiseev

Special Astrophysical Observatory, Nizhnij Arkhyz, Karachaevo-Cherkesia, 357147, Russia (moisav@sao.ru)

Received 3 November 1999 / Accepted 31 August 2000


The results of [FORMULA] and [NII][FORMULA] 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 [FORMULA] line shows two distinct components, with line-of-sight velocity differences of [FORMULA]. 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 [FORMULA] line ratio confirms the shock wave interpretation of these features. The ionized gas kinematics in this galaxy is discussed.

Key words: galaxies: individual: NGC 1084 – galaxies: ISM – galaxies: kinematics and dynamics

* Based on observations collected with the 6m and 1m telescopes of the Special Astrophysical Observatory (SAO) of the Russian Academy of Sciences (RAS), operated under the financial support of the Science Department of Russia (registration number 01-43).

© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000