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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report on the discovery of a molecular cavity in the Norma near arm in thegeneral direction of Westerlund 1 (Wd1), but not associated with it. The cavityhas a mean radial velocity of -91.5 kms^{-1}, which differs by as much as ~40kms^{-1} from the mean radial velocity of the Wd1 stars. The cavity issurrounded by a fragmented molecular shell of an outer diameter of about 100 pcand 10^{6} M_odot, which is expanding at velocities of 6 to 8 kms^{-1}. Theamount of kinetic energy involved in the expanding shell is ~10^{51} erg.Inside this cavity the atomic HI gas surface density is also the lowest.Structure of the extended Very High Energetic (VHE) gamma-ray emission,recently reported by the H.E.S.S. collaboration Ohm et al. 2009, coincides withthe cavity. The observed morphology suggests that the inner wall of themolecular shell is the zone of the gamma-ray emission, and not the dense gassurrounding massive stars of Wd1 as had been speculated by the H.E.S.S.collaboration. A likely candidate responsible for creating the observed cavityand the gamma-ray emission is the pulsar PSR J1648-4611.

The discovery of a molecular cavity in the Norma near arm associated to H.E.S.S gamma-ray source located in the direction of Westerlund 1