Molecular gas in the type 1 Seyfert galaxy NGC 7469 Implications for nuclear activity

Details Molecular gas in the type 1 Seyfert galaxy NGC 7469 Implications for nuclear activity Molecular gas in the type 1 Seyfert galaxy NGC 7469 Implications for nuclear activity

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...305..157h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 305, June 1, 1986, p. 157-166. Research supported by the Alfred P. Sloan Fo

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60

Astronomical Spectroscopy, Galactic Nuclei, Infrared Spectra, Molecular Gases, Seyfert Galaxies, Active Galaxies, Carbon Monoxide, Emission Spectra, Gas Density, Hydrogen, Interacting Galaxies, Line Spectra, Molecular Clouds, Starburst Galaxies

Scientific paper

The results of a search for 2.12-micron H2 1-0 S(1) line emission from the nuclear (not greater than 1 kpc) region in 11 active galaxies are reported. The galaxies observed included type 1 and type 2 Seyferts, LINERs, and starburst nucleus galaxies. H2 emission was detected in one galaxy, the classical type 1 Seyfert NGC 7469. Also reported is the detection of very luminous C-12O 2.6-mm emission from NGC 7469, and optical narrow-band images and long-slit spectroscopy data concerning the ionized gas in this galaxy are presented. These data imply that NGC 7469 not only contains a highly active compact nucleus but also is undergoing a luminous circumnuclear (few-kpc scale) starburst. Most of the other galaxies with known H2 emission also seem to be composite 'monster'/starburst systems and/or interacting galaxies. This result may arise because the molecular gas is associated with the starburst, while the primary form of the mechanical energy necessary to shock-excite the H2 is either outflow (possibly a wind) driven by the compact active nucleus or noncircular motions of gravitational origin. In either case, high-velocity (greater than 300 km/s) collisions between dense molecular clouds and a more ubiquitous, less dense gas phase can drive slow (10-30 km/s) shocks into the molecular clouds, exciting the observed H2 emission.

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