Search for Extremely-High-Velocity H2O Maser Emission Seyfert Galaxies

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Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47..771n&link_type=abstract

Publications of the Astronomical Society of Japan, v.47, p.771-799.

Astronomy and Astrophysics

Astronomy

74

Black Holes, Cosmology, Galaxies: Active, Galaxies: Individual (Ngc 253, Ngc 1068, Ngc 3079, Ngc 4945, M51, Circinus Galaxy), Galaxies: Nuclei, Masers

Scientific paper

We have searched for extremely-high-velocity H_2O maser emission in 18 Seyfert galaxies. The maser emission was detected within the velocity range of about +/- 1000 km s(-1) in NGC 4258 and of +/- (180--370) km s(-1) in NGC 253, NGC 1068, NGC 3079, NGC 4945, M51, and the Circinus galaxy, comprising systemic features and/or red- and blue-shifted features. The maser features of NGC 4258 are consistent with a compact disk rotating around a massive black hole at the center. Using the newly determined slope and velocity drift of the systemic features, the parameters of the rotating disk and the black hole have been revised. Although the velocities of the maser features detected in other galaxies are much lower than that of NGC 4258, these maser features do not conflict with a model of a molecular disk rotating with the velocity of < 200--400 km s(-1) around the center. The maximum velocities of the maser in most of the galaxies exceed the velocity ranges of CO or HI emission measured in the central regions of a few ten arcsec, suggesting faster rotation of the compact disks at the nuclei than the larger-scale galactic rotation. The central masses within the disks in NGC 1068 and NGC 3079 have been estimated from published data.

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