Long-Term Monitoring of 6.7- and 12.2-Ghz Methanol Masers

Details Long-Term Monitoring of 6.7- and 12.2-Ghz Methanol Masers Long-Term Monitoring of 6.7- and 12.2-Ghz Methanol Masers

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ap%26ss.295..197g&link_type=abstract

Astrophysics and Space Science, Volume 295, Issue 1-2, pp. 197-202

Astronomy and Astrophysics

Astrophysics

5

Masers, Star Formation

Scientific paper

A sample of 54 6.7-GHz methanol maser sources was monitored at HartRAO for 4 years, and 11 12.2-GHz methanol masers for 3 years. The majority of the maser features display a significant degree of variability but with a wide range of timescales and behaviors. Some maser features remained unvarying throughout the monitoring programme, while others showed sporadic flares or sudden drops in flux density. Yet another group show quasi-periodic and periodic variations. In some cases the maser features dropped below the detection limit for a significant length of time before increasing in intensity and reappearing.

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