Strong non - circular motions of gas in the spiral galaxy NGC 1084 ?
نویسنده
چکیده
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 s−1. 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.
منابع مشابه
Strong non - circular motions of gas in spiral galaxy NGC 1084 ⋆
The results of Hα and [NII]λ6583 observations of spiral galaxy NGC 1084 at the 6m telescope, with Fabry-Perot interferometer are presented. The complex structure of the emission lines profiles has revealed in the vicinity of the system of giant starformation regions (“spur”) in the NE part of the galaxy. In this region Hα line often has two distinct components, with lineof-sight velocities diff...
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