A Survey and Statistics of Interstellar OH and H2O Masers

Details A Survey and Statistics of Interstellar OH and H2O Masers A Survey and Statistics of Interstellar OH and H2O Masers

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005chjaa...5..175l&link_type=abstract

Chinese Journal of Astronomy and Astrophysics, Volume 5, Issue 2, pp. 175-183 (2005).

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

We present a statistical analysis of a sky survey of interstellar H2O and OH masers. These masers can be classified into three categories: isolated H2O masers, isolated OH masers, and simple OH/H2O maser associations. The total number of sources in each category is of the same order of magnitude, and as an evolutionary phase they can maintain ~ 105 yr. An improved radiative pumping mechanism is proposed. This model avoids some of the deficiencies of previous radiative models, such as shortage of exciting photons. The statistical results obtained from the survey can be interpreted by the new mechanism together with the evolutionary model in which the gravitational force of the central stellar objects is responsible for the HII region.

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