The structure and dynamics of the 30 Doradus molecular cloud as revealed by ALMA

Autor(en)
Tony Wong, Luuk Oudshoorn, Eliyahu Sofovich, Alex Green, Remy Indebetouw, Margaret Meixner, Alvaro Hacar, Omnarayani Nayak, Kazuki Tokuda, Alberto Bolatto, Mélanie Chevance, Guido De Marchi, Yasuo Fukui, Alec Hirschauer, Katherine Jameson, Venu Kalari, Vianney Lebouteiller, Leslie Looney, Suzanne Madden, Toshikazu Onishi, Julia Roman-Duval, Monica Rubio, Alexander Tielens
Abstrakt

We present results of a wide-field (approximately 60 × 90 pc) ALMA mosaic of CO(2-1) and 13CO(2-1) emission from the molecular cloud associated with the 30 Doradus star-forming region. Three main emission complexes, including two forming a bowtie-shaped structure extending northeast and southwest from the central R136 cluster, are resolved into complex filamentary networks. Consistent with previous studies, we find that the central region of the cloud has higher line widths at fixed size relative to the rest of the molecular cloud and to other LMC clouds, indicating an enhanced level of turbulent motions. However, there is no clear trend in gravitational boundedness (as measured by the virial parameter) with distance from R136. Structures observed in 13CO are spatially coincident with filaments and are close to a state of virial equilibrium. In contrast, 12CO structures vary greatly in virialization, with low CO surface brightness structures outside of the main filamentary network being predominantly unbound. The low surface brightness structures constitute ~10% of the measured CO luminosity; they may be shredded remnants of previously star-forming gas clumps, or alternatively the CO-emitting parts of more massive, CO-dark structures.

Organisation(en)
Institut für Astrophysik
Externe Organisation(en)
University of Virginia, University of Maryland, College Park, Universität Heidelberg, European Space Research & Technology Centre (ESA/ESTEC), Nagoya University, University of Illinois at Urbana-Champaign, Leiden University, Universities Space Research Association, Johns Hopkins University, Osaka Prefecture University, Space Telescope Science Institute, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Gemini Observatory, Centre National De La Recherche Scientifique (CNRS), Autorité de Sureté Nucléaire, Universidad de Chile
Journal
Bulletin of the American Astronomical Society
Band
54
ISSN
0002-7537
Publikationsdatum
06-2022
Peer-reviewed
Ja
ÖFOS 2012
103004 Astrophysik
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/06c64177-7b00-48bf-bcfb-9d4871dcd189