English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present the results of GBT observations of all four ground-state hydroxyl(OH) transitions toward 15 supernova remnants (SNRs) which show OH(1720 MHz)maser emission. This species of maser is well established as an excellenttracer of an ongoing interaction between the SNR and dense molecular material.For the majority of these objects we detect significantly higher flux densitieswith a single dish than has been reported with interferometric observations. Weinfer that spatially extended, low level maser emission is a common phenomenonthat traces the large-scale interaction in maser-emitting SNRs. Additionally weuse a collisional pumping model to fit the physical conditions under which OHis excited behind the SNR shock front. We find the observed OH gas associatedwith the SNR interaction having columns less than approximately 10^17 persquare cm, temperatures of 20 to 125 K, and densities 10^5 per cubic cm.

A Survey of Hydroxyl Toward Supernova Remnants: Evidence for Extended 1720 MHz Maser Emission