Abstract
Neutral hydrogen observations of 22.7 × 18.5 arcsec2 resolution are presented for the Seyfert type 1 galaxy NGC 5033. Our measurements show that the total Hi mass of the galaxy is 7.0 × 109 M⊙ and that it is receding at 870 km s-1. The column density map features prominent Hi spiral arms and an asymmetric plume of Hi which extends ∼6 kpc south of the galaxy. We find a well-ordered velocity field and the large-scale kinematical warp in the galactic disc has been modelled. The inner region of the velocity field is well fitted by a flat, inclined disc with inclination 68° and position angle 352°, but due to warping these fall to 64° and 342°, respectively, at large radii. Attention is paid to factors that may be related to Seyfert activity in the nucleus and we find some evidence for a previous tidal encounter but little evidence for a bar, or significant non-circular motions in the central regions. Large concentrations of H I at the galactic centre appear to show no evidence of interaction with the active nucleus.
Original language | English |
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Pages (from-to) | 15-24 |
Number of pages | 10 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 290 |
Issue number | 1 |
DOIs | |
Publication status | Published - Sept 1997 |
Keywords
- Atomic processes
- Galaxies: Individual: NGC 5033
- Galaxies: Kinematics and dynamics
- Galaxies: Seyfert
- Radio lines: Galaxies
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science