Bok globules in the Large Magellanic Cloud

Citation
Dr. Garnett et al., Bok globules in the Large Magellanic Cloud, ASTRONOM J, 117(3), 1999, pp. 1285-1291
Citations number
23
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMICAL JOURNAL
ISSN journal
00046256 → ACNP
Volume
117
Issue
3
Year of publication
1999
Pages
1285 - 1291
Database
ISI
SICI code
0004-6256(199903)117:3<1285:BGITLM>2.0.ZU;2-N
Abstract
We report the discovery of small, isolated dust clouds in the Large Magella nic Cloud (LMC) that are excellent candidates for counterparts to the Bok g lobules observed in the Galaxy. We detect these small clouds silhouetted ag ainst diffuse H alpha emission on the basis of parallel imaging with the Wi de Field Planetary Camera 2 on the Hubble Space Telescope. The clouds we id entify as Bok globule candidates have typical sizes of approximately 1 ", c orresponding to a linear diameter of about 0.25 pc at the distance of the L MC. We derive lower limits for the optical depth within the dark clouds and masses, assuming that the clouds have density distributions similar to Gal actic Bok globules. The sizes and estimated masses for LMC globules are com parable to those estimated for Galactic globules. An extended sample of suc h objects would be excellent targets for high-resolution infrared and milli meter observations to study low-mass star formation in such clouds in low-m etallicity environments where the distance is well known.