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 present the results of analyses of the 12CO (J=1-0), 13CO (J=1-0), and12CO (J=2-1) emission data toward Gum 31. Three molecular clouds separated invelocity were detected at -25, -20, and -10 km/s . The velocity structure ofthe molecular clouds in Gum 31 cannot be interpreted as expanding motion. Twoof them, the -25 km/s cloud and the -20 km/s cloud, are likely associated withGum 31, because their 12CO (J=2-1)/12CO (J=1-0) intensity ratios are high. Wefound that these two clouds show the observational signatures of cloud-cloudcollisions (CCCs): a complementary spatial distribution and a V-shapedstructure (bridge features) in the position-velocity diagram. In addition,their morphology and velocity structures are very similar to the numericalsimulations conducted by the previous studies. We propose a scenario that the-25 km/s cloud and the -20 km/s cloud were collided and triggered the formationof the massive star system HD 92206 in Gum 31. This scenario can explain theoffset of the stars from the center and the morphology of Gum 31simultaneously. The timescale of the collision was estimated to be ~1 Myr byusing the ratio between the path length of the collision and the assumedvelocity separation. This is consistent with that of the CCCs in Carina NebulaComplex in our previous study.

Massive star formation in the Carina nebula complex and Gum 31 -- II. a cloud-cloud collision in Gum 31