Astron. Astrophys. Suppl. Ser. 141, 193-209
Dense molecular gas in Seyfert galaxies
S.J. Curran - S. Aalto - R.S. Booth
Send offprint request: S. Curran
1 - Onsala Space Observatory,
Chalmers University of Technology,
S-439 92 Onsala,
Received March 2; accepted October 22, 1999
We have used the 20 m Onsala and 15 m SEST
telescopes to observe the CO
at SEST) and HCN
(simultaneously with CS
at SEST) transitions in
20 Seyfert galaxies. The sample consists of the 18 galaxies
detected in CO
by [Heckman et al. (1989)] plus 2 which
were not detected in their survey. We have successfully detected
all of the galaxies in the CO transition and 13 in HCN of which
NGCs 1667, 2273, 5033, 5135, 6814 and Mrk 273 are new
detections. For the galaxies in which the beam-width exceeds
kpc we find that
i.e. a global ratio similar to that of
ultra-luminous infrared galaxies and over 10 times the ratio for
normal spiral galaxies. This implies that
and we believe that the far infrared fluxes in
our sample arise from star-burst activity, although we cannot
rule out the possibility of a contribution from active galactic
Key words: galaxies: Seyfert-galaxies: abundances -- galaxies:
Copyright The European Southern Observatory (ESO)
The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.
An OpenURL link contains article metadata and directs it to the
OpenURL server of your choice. The OpenURL server can provide access
to the resource and also offer complementary services (specific
search engine, export of references...). The OpenURL link can be
generated by different means.
If your librarian has set up your subscription with an
OpenURL resolver, OpenURL links appear automatically on the abstract pages.
You can define your own OpenURL resolver with your
In this case your choice will be given priority over that of your library.
You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see
You should disable this module if you wish to use the OpenURL server that you or your library have defined.