Astronomy and Astrophysics – Astronomy
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238l...7m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 238, May 15, 1980, p. L7-L10.
Astronomy and Astrophysics
Astronomy
26
Centimeter Waves, Galactic Structure, Hydrogen Atoms, Intergalactic Media, Radio Astronomy, Radio Galaxies, Seyfert Galaxies, Astronomical Maps, Galactic Rotation, Neutral Gases
Scientific paper
The Type 2 Seyfert galaxy Mrk 348 has been mapped at 21 cm using the Arecibo radio telescope. Emission from H I is extended over an 8 x 12 arcmin region (approximately 200 x 300 kpc if the Hubble constant is equal to 55 km/sec per Mpc), which is an order of magnitude larger than the Holmberg diameter of the nearly face-on galaxy. The velocity field in the H I envelope indicates a rising rotation curve out to at least 100 kpc, but because of the small and unknown inclination angle of Mrk 348, the velocity field is difficult to interpret. Near the central galaxy, the isovelocity contours deviate from those expected if the H I is simply undergoing circular motion in a plane. Three explanations are considered for this, including warping of the plane, gas flow in a giant bar, and radial inflow. It is argued that the H I envelope is primordial material, and that it may have implications for quasar absorption lines.
Morris Marita
Wannier Peter G.
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