SUPERGIANT SHELLS AND MOLECULAR CLOUD FORMATION IN THE LARGE MAGELLANIC CLOUD
Open Access
- 8 January 2013
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 763 (1), 56
- https://doi.org/10.1088/0004-637x/763/1/56
Abstract
We investigate the influence of large-scale stellar feedback on the formation of molecular clouds in the Large Magellanic Cloud (LMC). Examining the relationship between H I and 12CO(J = 1-0) in supergiant shells (SGSs), we find that the molecular fraction in the total volume occupied by SGSs is not enhanced with respect to the rest of the LMC disk. However, the majority of objects (~70% by mass) are more molecular than their local surroundings, implying that the presence of a supergiant shell does on average have a positive effect on the molecular gas fraction. Averaged over the full SGS sample, our results suggest that ~12%-25% of the molecular mass in supergiant shell systems was formed as a direct result of the stellar feedback that created the shells. This corresponds to ~4%-11% of the total molecular mass of the galaxy. These figures are an approximate lower limit to the total contribution of stellar feedback to molecular cloud formation in the LMC, and constitute one of the first quantitative measurements of feedback-triggered molecular cloud formation in a galactic system.This publication has 100 references indexed in Scilit:
- THE LIFE AND DEATH OF DENSE MOLECULAR CLUMPS IN THE LARGE MAGELLANIC CLOUDThe Astrophysical Journal, 2012
- THE CO-TO-H2CONVERSION FACTOR FROM INFRARED DUST EMISSION ACROSS THE LOCAL GROUPThe Astrophysical Journal, 2011
- Rapid Molecular Cloud and Star Formation: Mechanisms and MoviesThe Astrophysical Journal, 2008
- Evidence for Tidal Effects in the Stellar Dynamics of the Large Magellanic CloudThe Astrophysical Journal, 2007
- The formation of molecular clouds in spiral galaxiesMonthly Notices of the Royal Astronomical Society, 2006
- Dynamical Expansion of Ionization and Dissociation Front around a Massive Star. II. On the Generality of Triggered Star FormationThe Astrophysical Journal, 2006
- Molecular Cloud Evolution. I. Molecular Cloud and Thin Cold Neutral Medium Sheet FormationThe Astrophysical Journal, 2006
- Magellanic Cloud Structure from Near-Infrared Surveys. I. The Viewing Angles of the Large Magellanic CloudThe Astronomical Journal, 2001
- An HiAperture Synthesis Mosaic of the Large Magellanic CloudThe Astrophysical Journal, 1998
- On the hydrodynamic interaction of shock waves with interstellar clouds. 1: Nonradiative shocks in small cloudsThe Astrophysical Journal, 1994