Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.290...15t&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 290, Issue 1, pp. 15-24.
Astronomy and Astrophysics
Astronomy
18
Atomic Processes, Galaxies: Individual: Ngc 5033, Galaxies: Kinematics And Dynamics, Galaxies: Seyfert, Radio Lines: Galaxies
Scientific paper
Neutral hydrogen observations of 22.7x18.5 arcsec^2 resolution are presented for the Seyfert type 1 galaxy NGC 5033. Our measurements show that the total Hi mass of the galaxy is 7.0x10^9 Msolar 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 deg and position angle 352 deg, but due to warping these fall to 64 deg and 342 deg, 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 Hi at the galactic centre appear to show no evidence of interaction with the active nucleus.
Mundell Carole G.
Nicholson Randy A.
Pedlar Alan
Thean A. H. C.
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