Other
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352..433k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 352, April 1, 1990, p. 433-447. Research supported by the Monbusho Internat
Other
45
Emission Spectra, Galactic Nuclei, H Lines, Molecular Clouds, Quasars, Seyfert Galaxies, Interstellar Gas, Near Infrared Radiation, Spectral Line Width
Scientific paper
Results are presented from a search for H2 emission lines in the near-IR for a group of 18 type 1 Seyferts and quasars. Lines were detected in 12 objects including two quasars, 3C 273 and IRAS 13349 + 2438 and one bare type 1 Seyfert NGC 3783. The data for H2 and Br-gamma lines are analyzed and the H2 emission properties are compared with those in dusty AGN and H II region galaxies. The results suggest that H2 emission is closely related to AGN activity and that X-ray heating is the mechanism for H2 excitation in type 1 Seyferts and quasars. A transition from type 2 Seyferts to type 1 Seyferts is proposed in terms of the consumption of molecular clouds due to mass inflow to the center and star-forming regions. It is shown that the observations, combined with other observations from X-ray to radio wavelengths, may be explained consistently with the molecular torus models.
Gregory Brooke
Kawara Kimiaki
Nishida Minoru
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