Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasj...49..171h&link_type=abstract
Publications of the Astronomical Society of Japan, v.49, p.171-177.
Astronomy and Astrophysics
Astronomy
35
Galaxies: Active, Galaxies: Individual (Ngc 5793), Galaxies: Nuclei, Masers
Scientific paper
We have found an extragalactic water-vapor megamaser source in NGC 5793, an edge-on spiral galaxy. Its spectral profile shows two distinct high-velocity maser features, one on each side of the systemic velocity of the galaxy. They are almost symmetrically offset from the systemic velocity. The isotropic luminosity of the features is as large as 125 LO at a distance of 50 Mpc. Weaker features at the systemic velocity were possibly detected. We have constructed a model which explains our observational data. The H_2O maser emission is emitted from a nearly edge-on circumnuclear disk, or torus, whose diameter is estimated to be larger than 4--20 pc, with a rotation velocity of V_rot = 245 km s(-1) at an inferred inclination angle of 73(deg) . The high-velocity features arise from gas at the tangential regions of the disk, or torus, and the systemic features from the region in our line of sight toward the center. In our model, the nuclear mass confined within the disk or torus is larger than 1.5 times 10(8) MO .
Hagiwara Yoshiaki
Kawabe Ryohei
Kohno Kotaro
Nakai Naomasa
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