Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..613b&link_type=abstract
SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli
Astronomy and Astrophysics
Astrophysics
Scientific paper
In active galaxies H2O megamaser emission at 22 GHz allows us to directly probe the hot and dense molecular gas in the accretion disk around the central black hole on (sub)parsec scales. Some of the megamasers also trace the interaction of jets with a dense interstellar cloud located in the nuclear environment. It is thus complementary to the CO emission which can be used to probe the molecular gas of the galactic disk at 10-100 parsec scale (with interferometers). Combining these two observables for a sample of galaxies will provide essential clues for a better understanding of the mechanisms responsible for AGN fueling, the starburst/AGN connection or the feedback of the AGN on the ISM. We report on CO(1-0) and (2-1) observations of 25 megamaser galaxies with the IRAM 30m. The high detection rate, the identical line widths of both transitions and the tight correlation between line ratio and dust temperature suggest that water maser galaxies have a substantial amount of molecular gas concentrated within the inner kiloparsec.
Boone Frederic
Henkel Carsten
Weiss Alexander
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