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

Mark Wardle*

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

OH (1720 MHz) masers serve as indicators of SNR - molecular cloud interaction sites. These masers are collisionally excited in warm (50-100 K) shocked gas with densities of order 105cm3 when the OH column density is in the range 10161017cm2. Here I present excitation calculations which show that when the OH column density exceeds 1017cm2 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.

Original languageEnglish
Pages (from-to)336-337
Number of pages2
JournalProceedings of the International Astronomical Union
Volume3
Issue numberS242
DOIs
Publication statusPublished - Mar 2007

Keywords

  • Molecular processes
  • Radiation mechanisms: nonthermal
  • Radio lines: ISM
  • Supernova remnants

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