Periodic variations of the extragalactic H2O maser in NGC 4258

Details Periodic variations of the extragalactic H2O maser in NGC 4258 Periodic variations of the extragalactic H2O maser in NGC 4258

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...355l..23h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 355, May 20, 1990, p. L23-L26.

Astronomy and Astrophysics

Astrophysics

24

Intergalactic Media, Interstellar Masers, Variable Stars, Water Masers, Water Vapor, Astronomical Models, Optical Pumping, Radio Galaxies, Stellar Flares

Scientific paper

The H2O maser emission in the galaxy NGC 4258 has been monitored over the time period April 1984 to July 1989 and has shown rapid variability in the velocity range centered on 465 km/s. Five distinct flares with a separation of 85 days or 2.8 months were observed during the last period of monitoring of 1 year. The center velocity has shown a systematic change of 10 km/s during these five outbursts. The line width varied with the line intensity as I exp -0.47 during one of these flares. This dependence indicates that the maser is mostly unsaturated during the bursts.

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