Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...436l.127n&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 436, no. 2, p. L.127-130
Astronomy and Astrophysics
Astrophysics
146
Active Galactic Nuclei, Interstellar Gas, Masers, Seyfert Galaxies, Toruses, X Ray Irradiation, Luminosity, Radial Distribution, Spatial Distribution, Spectral Emission, Very Long Base Interferometry
Scientific paper
We have modeled the physical and chemical conditions present within dense circumnuclear gas that is irradiated by X-rays from an active galactic nucleus. Over a wide range of X-ray fluxes and gas pressures, the effects of X-ray heating give rise to a molecular layer at temperatures of 400-1000 K within which the water abundance is large. The physical conditions within this molecular layer naturally give rise to collisionally pumped maser emission in the 616 - 523 22 GHz transition of ortho-water, with predicted maser luminosities of 102 +/- 0.5 solar luminosity per sq. pc of illuminated area. Given plausible assumptions about the geometry of the source and about the degree to which the maser emission is anisotropic, such surface luminosities are sufficient to explain the large apparent luminosities observed in water maser sources that are associated with active galactic nuclei.
Conger Sarah
Maloney Philip R.
Neufeld David A.
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