Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 353, Issue 4, Pages 1151-1160Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1111/j.1365-2966.2004.08139.x
Keywords
ISM : molecules; galaxies : Seyfert; radio lines : galaxies
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We have used the 15-m Swedish European Southern Observatory (ESO) Submillimetre Telescope (SEST) to observe the J=1-->0 and J=2-->1 transition lines of CO in 30 Southern hemisphere Seyfert galaxies from the extended 12-mum sample of Rush, Malkan & Spinoglio. We detected CO J=1-->0 in 16 out of the 30 Seyfert galaxies and CO J=2-->1 in 17 out of the 30 Seyfert galaxies. From the observed spectra, various CO gas properties have been derived including the luminosity of the CO gas and, using a standard conversion factor, the H-2 mass. The average H-2 gas mass for Seyfert 1 galaxies was 3x10(9) M-circle dot for CO J=1-->0 and 1x10(9) M-circle dot for CO J=2-->1, while in comparison the H-2 gas mass for Seyfert 2 type galaxies was 11x10(9) M-circle dot for CO J=1-->0 and 3x10(9) M-circle dot CO J=2-->1. From this small sample of Seyfert galaxies, we tentatively support the conclusion that type 2 Seyfert galaxies contain more molecular gas than their type 1 counterparts.
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