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ALMA RESOLVES 30 DORADUS: SUB-PARSEC MOLECULAR CLOUD STRUCTURE NEAR THE CLOSEST SUPER STAR CLUSTER

Indebetouw, Rémy; Brogan, Crystal; Chen, C.-H. Rosie; Leroy, Adam; Johnson, Kelsey; Muller, Erik; Madden, Suzanne; Cormier, Diane; Galliano, Frédéric; Hughes, Annie; Hunter, Todd; Kawamura, Akiko; Kepley, Amanda; Lebouteiller, Vianney; Meixner, Margaret; Oliveira, Joana M.; Onishi, Toshikazu; Vasyunina, Tatiana

Authors

Rémy Indebetouw

Crystal Brogan

C.-H. Rosie Chen

Adam Leroy

Kelsey Johnson

Erik Muller

Suzanne Madden

Diane Cormier

Frédéric Galliano

Annie Hughes

Todd Hunter

Akiko Kawamura

Amanda Kepley

Vianney Lebouteiller

Margaret Meixner

Toshikazu Onishi

Tatiana Vasyunina



Abstract

We present Atacama Large (sub)Millimeter Array observations of 30 Doradus—the highest resolution view of molecular gas in an extragalactic star formation region to date (∼0.4 pc × 0.6 pc). The 30Dor-10 cloud north of R136 was mapped in 12CO 2–1, 13CO 2–1, C18O 2–1, 1.3 mm continuum, the H30α recombination line, and two H2CO 3–2 transitions. Most 12CO emission is associated with small filaments and clumps (≲1 pc, ∼103 M☉ at the current resolution). Some clumps are associated with protostars, including "pillars of creation" photoablated by intense radiation from R136. Emission from molecular clouds is often analyzed by decomposition into approximately beam-sized clumps. Such clumps in 30 Doradus follow similar trends in size, linewidth, and surface density to Milky Way clumps. The 30 Doradus clumps have somewhat larger linewidths for a given size than predicted by Larson's scaling relation, consistent with pressure confinement. They extend to a higher surface density at a given size and linewidth compared to clouds studied at 10 pc resolution. These trends are also true of clumps in Galactic infrared-dark clouds; higher resolution observations of both environments are required. Consistency of clump masses calculated from dust continuum, CO, and the virial theorem reveals that the CO abundance in 30 Doradus clumps is not significantly different from the Large Magellanic Cloud mean, but the dust abundance may be reduced by ∼2. There are no strong trends in clump properties with distance from R136; dense clumps are not strongly affected by the external radiation field, but there is a modest trend toward lower dense clump filling fraction deeper in the cloud.

Citation

Indebetouw, R., Brogan, C., Chen, C. R., Leroy, A., Johnson, K., Muller, E., …Vasyunina, T. (in press). ALMA RESOLVES 30 DORADUS: SUB-PARSEC MOLECULAR CLOUD STRUCTURE NEAR THE CLOSEST SUPER STAR CLUSTER. Astrophysical Journal, 774(1), Article 73. https://doi.org/10.1088/0004-637x/774/1/73

Journal Article Type Article
Acceptance Date Jul 11, 2013
Online Publication Date Aug 19, 2013
Deposit Date Jun 14, 2023
Journal The Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 774
Issue 1
Article Number 73
DOI https://doi.org/10.1088/0004-637x/774/1/73
Keywords Space and Planetary Science; Astronomy and Astrophysics