Collisional excitation of OH(6049 MHz) masers in supernova remnant - molecular cloud interactions

Details Collisional excitation of OH(6049 MHz) masers in supernova remnant - molecular cloud interactions Collisional excitation of OH(6049 MHz) masers in supernova remnant - molecular cloud interactions

2007-03-19

arxiv.org/abs/astro-ph/0703508v2

Astronomy and Astrophysics

Astrophysics

2 pages, 2 figs, iaus.cls. To appear in IAU 242, Astrophysical Masers and Their Environments, eds. J. Chapman & W. Baan. Addit

Scientific paper

10.1017/S1743921307013300

OH (1720 MHz) masers serve as indicators of SNR - molecular cloud interaction sites. These masers are collisionally excited in warm (50-100K) shocked gas with densities of order 1e5 cm^-3 when the OH column density is in the range 1e16-1e17 cm^-2. Here I present excitation calculations which show that when the OH column density exceeds 1e17 cm^-2 at similar densities and temperatures, the inversion of the 1720 MHz line switches off and instead the 6049 MHz transition in the first excited rotational state of OH becomes inverted. This line may serve as a complementary signal of warm, shocked gas when the OH column density is large.

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