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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We used the Green Bank Telescope to detect molecular lines observed towardMid-Infrared (MIR) bubbles N62, N65, N90, and N117. The bubbles were selectedfrom Watson et al. (2016) who detected non-Gaussian CS (1-0) emission linestoward the bubbles. Two of the bubbles are adjacent to infrared dark clouds(IRDCs); we examined these sources for evidence of interaction between thebubble rim and IRDC. The other two bubbles contain YSOs interior to the bubblerim; in these sources we observed the gas near the YSOs. We detect CS (1-0)emission toward all of the sources, and in several pointings the CS emissionshows non-Gaussian line shapes. HC$_3$N (5-4), C$^{34}$S (1-0), CH$_3$OH (1-0),and SiO (v=0) (1-0) were also detected in some pointings. We calculate columndensities and abundances for the detected molecules. We compare the velocity ofoptically-thick CS emission with the velocity of the other, optically thinlines to look for evidence of infall. We find that even in pointings withnon-Gaussian CS emission, our detections do not support an infall model. Weinterpret the kinematics of the gas in N62, N65, and N117 as likely evidence ofmultiple clouds along the line of sight moving at slightly offset velocities.We do not detect evidence of bubble rims interacting with IRDCs in N62 or N90.The gas interior to bubbles appears more disrupted than the gas in the IRDCs.N65 shows significantly stronger emission lines than the other sources, as wellas the most complicated non-Gaussian line shapes.

A Molecular Line Investigation of the Interaction between Mid-infrared Bubbles and the Interstellar Medium