Journal
ASTRONOMICAL JOURNAL
Volume 125, Issue 3, Pages 1226-1235Publisher
IOP PUBLISHING LTD
DOI: 10.1086/367595
Keywords
galaxies : individual (M81, NGC 3031); galaxies : Seyfert
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Spectroscopic observations of the central 10 pc of M81 were obtained with STIS on board the Hubble Space Telescope during Cycle 7. Measurements of the Halpha+[N II] blend reveal a velocity field indicative of a rotating disk of gas. The two-dimensional velocity field has been modeled as a thin disk rotating in a spherical gravitational potential. Minimizing the difference between the model and the observations allows useful constraints to be placed on the mass of the black hole in this mini Seyfert 1 galaxy. The data suggest that the mass of the nuclear black hole in M81 is 7.0(-1)(+2) x 10(7) M-circle dot and that the normal to the disk is inclined at an angle of 14degrees +/- 2degrees to the line of sight.
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