Extremely-high-velocity H2O maser emission in the galaxy NGC4258

Details Extremely-high-velocity H2O maser emission in the galaxy NGC4258 Extremely-high-velocity H2O maser emission in the galaxy NGC4258

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.361...45n&link_type=abstract

Nature (ISSN 0028-0836), vol. 361, no. 6407, p. 45-47.

Astronomy and Astrophysics

Astronomy

102

Interstellar Masers, Spiral Galaxies, Water Masers, Astronomical Spectroscopy, Black Holes (Astronomy), Galactic Nuclei, Milky Way Galaxy, Radio Jets (Astronomy), Star Formation

Scientific paper

The detection of H2O maser emission in the nucleus of the galaxy NGC 4258, offset by +/- 1000 km/s from the motion of the nucleus itself, is reported. This is much higher than the typical velocities of galactic masers (less than a few hundred kilometers per second). It is suggested that the high-velocity maser emission in NGC 4258 might be from masers orbiting a massive central black hole, or ejected in a bipolar outflow. It is proposed that the features may not be Doppler in origin, but due to up-shifted and down-shifted frequencies by Raman scattering in a dense plasma.

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