A millimeter-wave survey of CO emission in Seyfert galaxies

Journal Article · Sat Jul 01 00:00:00 EDT 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/167633· OSTI ID:5398086

Heckman, T M; Blitz, L; Wilson, A S; Armus, L; Miley, G K ^[1]

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1. Maryland Univ., College Park (USA)

Emission in the 115 GHz 1-0 line of CO has been detected in 18 Seyfert galaxies in a sample of 43. The CO properties of 29 Seyferts in the Revised Shapley Ames Catalog (RSA) are compared with the CO properties of normal galaxies of the same Hubble type. These RSA type 2 Seyferts have an average ratio of CO-to-blue luminosity that is about twice as large as that of the normal galaxies, but the RSA type 1 Seyferts have normal CO luminosities. The RSA type 2 Seyfert galaxies have an unusually large average ratio of CO luminosity-to-H I mass compared to normal disk galaxies. The RSA type 2 Seyferts have an average far-IR luminosity that is about four times larger than a non-Seyfert comparison sample, while the RSA type 1 Seyferts are not significantly more luminous than the non-Seyferts. The result imply that the two classes of Seyferts are intrinsically different from one another and that one class cannot evolve into another in less than a few million years. 129 refs.

• OSTI ID: 5398086
• Journal Information: Astrophysical Journal; (USA), Vol. 342; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SEYFERT GALAXIES
EMISSION SPECTRA
CARBON MONOXIDE
CLASSIFICATION
FAR INFRARED RADIATION
FORBIDDEN TRANSITIONS
GALACTIC EVOLUTION
GALAXY NUCLEI
INTERSTELLAR SPACE
LUMINOSITY
MASS
RADIOASTRONOMY
ASTRONOMY
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
GALAXIES
INFRARED RADIATION
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
SPACE
SPECTRA
640105* - Astrophysics & Cosmology- Galaxies