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The molecular ridge close to 30 Doradus in the Large Magellanic Cloud

Ott, Jürgen and Wong, Tony and Pineda, Jorge L. and Hughes, Annie and Muller, Erik and Li, Zhi-Yun and Wang, Min and Staveley-Smith, Lister and Fukui, Yasuo and Weiß, Axel and Henkel, Christian and Klein, Ulrich (2008) The molecular ridge close to 30 Doradus in the Large Magellanic Cloud. Publications of the Astronomical Society of Australia, 25 (3). pp. 129-137. ISSN 1323-3580. doi:10.1071/AS07054.

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With the ATNF Mopra telescope we are performing a survey in the ^(12)CO(1–0) line to map the molecular gas in the Large Magellanic Cloud. For some regions we also obtained interferometric maps of the high density gas tracers HCO^+ and HCN with the Australia Telescope Compact Array. Here we discuss the properties of the elongated molecular complex that stretches about 2 kpc southward from 30 Doradus. Our data suggest that the complex, which we refer to as the ‘molecular ridge’, is not a coherent feature but consists of many smaller clumps that share the same formation history. Likely triggers of molecular-cloud formation are shocks and shearing forces that are present in the surrounding south-eastern H_I overdensity region, a region influenced by strong ram pressure and tidal forces. The molecular ridge is at the western edge of the the overdensity region where a bifurcated velocity structure transitions into a single disk velocity component. We find that the ^(12)CO(1–0) and H_I emission peaks in the molecular ridge are typically near each other but never coincide. A likely explanation is the conversion of warmer, low-opacity H_I to colder, high-opacity H_I from which H_2 subsequently forms. On smaller scales we find that very dense molecular gas, as traced by interferometric HCO^+ and HCN maps, is associated with star formation along shocked filaments and with rims of expanding shell-like structures, both created by feedback from massive stars.

Item Type:Article
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URLURL TypeDescription
Ott, Jürgen0000-0001-8224-1956
Pineda, Jorge L.0000-0001-8898-2800
Weiß, Axel0000-0003-4678-3939
Additional Information:© Astronomical Society of Australia 2008. Received 2007 December 20, accepted 2008 May 10. Published: 29 September 2008. Jürgen Ott is a Jansky Fellow of the National Radio Astronomy Observatory. Erik Muller is a Bolton Fellow. The Australia Telescope Compact Array is part of the Australia Telescope which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.
Funding AgencyGrant Number
Commonwealth of AustraliaUNSPECIFIED
Subject Keywords:ISM: evolution; ISM: molecules; galaxies: ISM; galaxies: individual (Large Magellanic Cloud); radio lines: ISM; galaxies: Magellanic Clouds
Issue or Number:3
Record Number:CaltechAUTHORS:OTTpaas08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13639
Deposited By: Tony Diaz
Deposited On:16 Jun 2009 15:03
Last Modified:08 Nov 2021 22:39

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