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/

Zendy Plus

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

Zendy Tools

Zendy Open

The Trifid Nebula is a young, nearby star-forming region where star formationis proposed to have been triggered by cloud-cloud collision (CCC), based onobservations of molecular clouds. It offers a unique opportunity to testwhether the CCC hypothesis is supported by the spatial distribution and starformation chronology of young stars. We present the first study of theoptically visible pre-main sequence (PMS) population of the region usingriH$\alpha$ imaging and Gaia astrometry. Combined with an analysis of youngstellar objects (YSOs) using infrared imaging, we capture the spatialdistribution and star formation chronology of the young stellar population.From the analysis, 15 Flat/Class I YSOs, 46 Class II YSOs, and 41 accreting PMSstars are identified (diskless/non-accreting sources are not included in theanalysis). The distance based on Gaia parallaxes is $\sim$1250 pc,significantly closer than previously reported. The Class II YSOs and PMS stars($\sim$1.5 Myr old) are spread toward the edge of the molecular clouds. Theyare slightly younger than the estimated crossing time of $\sim$2.7Myr andcloser to the estimated dynamical age $\sim$0.85 Myr. Younger Class I YSOs aremore concentrated spatially. There exists a cavity devoid of young stars wherethe two clouds overlap. This evidence suggests that the current generation ofstars formed after the collision of two clouds $\sim$1 Myr ago, and this resultcan be corroborated using future spectroscopic studies.

The Young Stellar Population, Distance, and Cloud-Cloud Collision Induced Star Formation Scenario of the Trifid Nebula