A Model for the Molecular Accretion Disk and H_2O Maser in the Nucleus of the Galaxy NGC4258

Details A Model for the Molecular Accretion Disk and H_2O Maser in the Nucleus of the Galaxy NGC4258 A Model for the Molecular Accretion Disk and H_2O Maser in the Nucleus of the Galaxy NGC4258

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000astl...26..144b&link_type=abstract

Astronomy Letters, vol. 26, p. 144-152 (2000)

Astronomy and Astrophysics

Astronomy

3

Scientific paper

A model is developed for the H_2O maser source observed in the circumnuclear region of the galaxy NGC4258. The maser emission originates at distances of 0.15-0.29 pc from the center in a thin, cold accretion disk (gas-dust torus) rotating around a supermassive black hole of mass 4 x 10^7 M_solar. The conditions for the emergence of an inverse population of the signal 616-523 levels in ortho-H_2O working molecules are simulated numerically. The complex line profile, which includes both central and high-velocity components, is calculated. A comparison of the calculations with radiointerferometric and spectrophotometric observations allowed the physical conditions in the emitting region to be determined.

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