Interactions of mid-infrared bubbles with the interstellar medium: are bubble rims associated with collapsing cores?
Abstract
Mid-infrared bubbles expanding into the interstellar medium (ISM) are often proposed as a trigger for subsequent star formation, although the mechanisms of this triggering are not well understood. Better observational data of the ISM near bubbles can elucidate the connection between bubbles and nearby star formation. We used the VEGAS spectrometer on the Green Bank Telescope to simultaneously observe several Q-band emission lines between 45-49 GHz. We detected HC3N, C34S, CH3OH, and CS toward four mid-infrared (MIR) bubbles. Two of the bubbles are spatially coincident with dark filaments. We show that in both of these cases, the bubbles do not appear to be causing infall in the filaments. We also present the gas kinematics toward two gas clumps coincident with bubble rims. Both clumps show evidence of infall. Finally, we present trends seen in the chemical abundances relative to the bubble.
- Publication:
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American Astronomical Society Meeting Abstracts #229
- Pub Date:
- January 2017
- Bibcode:
- 2017AAS...22915311D