Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358..132t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, July 20, 1990, p. 132-138. Research supported by the Japan Society for
Astronomy and Astrophysics
Astronomy
19
Active Galactic Nuclei, Extragalactic Radio Sources, Interstellar Matter, Molecular Gases, Seyfert Galaxies, Carbon Monoxide, Emission Spectra, Gas Density, Line Spectra, Radio Astronomy
Scientific paper
A search is made for circumnuclear C-12O (J = 1-0) emission from 12 Seyfert galaxies with recession velocities less than 5000 km/s, using the Nobeyama Radio Observatory 45 m telescope. Circumnuclear CO emission has been detected from four Seyfert galaxies. Among them, NGC 591 (= Mrk 1157) is a new detection. Comparing these results with those of published larger beam CO observations, molecular gas clouds are not highly concentrated in the circumnuclear zones in the Seyfert galaxies. This property is different from that of starburst nuclei, in which the inner surface density of molecular gas is significantly higher than that of the outer one. However, there is no significant difference in the circumnuclear molecular gas densities between the Seyferts and the starburst nuclei. This implies that the circumnuclear molecular gas density within a diameter of less than 5 kpc is not a key parameter which activity occurs in galactic nuclei.
Kameya Osamu
Kawara Kimiaki
Nakai Naomasa
Taniguchi Yoshiaki
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