Ionized gas rotation curves in nearby dwarf galaxies

We present the results of study of the ionized gas velocity fields in 28 nearby (systemic velocity below 1000 km s −1 ) dwarf galaxies. The observations were made at the 6-m BTA telescope of the SAO RAS with the scanning Fabry-Perot interferometer in the H α emission line. We were able to measure re...

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Bibliographic Details
Published in:Astrophysical bulletin 2014, Vol.69 (1), p.1-20
Main Author: Moiseev, A. V.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Astrophysics and Cosmology
Gases
Kinematics
Physics
Physics and Astronomy
Stars & galaxies
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Summary:We present the results of study of the ionized gas velocity fields in 28 nearby (systemic velocity below 1000 km s −1 ) dwarf galaxies. The observations were made at the 6-m BTA telescope of the SAO RAS with the scanning Fabry-Perot interferometer in the H α emission line. We were able to measure regular circular rotation parameters in 25 galaxies. As a rule, rotation velocities measured in HII are in a good agreement with the data on the HI kinematics at the same radii. Three galaxies reveal position angles of the kinematic axis in the HII velocity fields that strongly (tens of degrees) differ from the measurements in neutral hydrogen at large distances from the center or from the orientation of the major axis of optical isophotes. The planes of the gaseous and stellar disks in these galaxies most likely do not coincide. Namely, in DDO99 the gaseous disk is warped beyond the optical radius, and in UGC3672 and UGC8508 the inclination of orbits of gas clouds varies in the inner regions of galaxies. It is possible that the entire ionized gas in UGC8508 rotates in the plane polar to the stellar disk.
ISSN:1990-3413
1990-3421
DOI:10.1134/S1990341314010015