Kim, S. and Paradis, D. and Reach, W. T. (2010) Cold dust clumps in dynamically hot gas. Astronomy and Astrophysics, 518 . Art. No. L75. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20101123-083824723
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Aims. We present clumps of dust emission from Herschel observations of the Large Magellanic Cloud (LMC) and their physical and statistical properties. We catalog cloud features seen in the dust emission from Herschel observations of the LMC, the Magellanic type irregular galaxy closest to the Milky Way, and compare these features with Hi catalogs from the ATCA+Parkes Hi survey. Methods. Using an automated cloud-finding algorithm, we identify clouds and clumps of dust emission and examine the cumulative mass distribution of the detected dust clouds. The mass of cold dust is determined from physical parameters that we derive by performing spectral energy distribution fits to 250, 350, and 500 μm emission from SPIRE observations using dust grain size distributions for graphite/silicate in low-metallicity extragalactic environments. Results. The dust cloud mass spectrum follows a power law distribution with an exponent of γ = −1.8 for clumps larger than 4 × 10^2 M_⊙ and is similar to the Hi mass distribution. This is expected from the theory of ISM structure in the vicinity of star formation.
|Additional Information:||© 2010 ESO. Received 31 March 2009; Accepted 16 April 2010. Published online 16 July 2010. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. We acknowledge financial support from the NASA Herschel Science Center, JPL contracts # 1381522 & 1381650. We thank the contributions and support from the European Space Agency (ESA), the PACS and SPIRE teams, the Herschel Science Center and the NASA Herschel Science Center (esp. A. Barbar and K. Xu) and the PACS and SPIRE instrument control centers, without which none of this work would be possible. We thank the referee for his/her very important comments on the manuscript. S.K. and E.K. were supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology 2009-0066892. M.R. is supported by FONDECYT No. 1080335 and FONDAP No. 15010003.|
|Subject Keywords:||submillimeter: ISM; Magellanic Clouds; ISM: structure; ISM: clouds|
|Official Citation:||Cold dust clumps in dynamically hot gas S. Kim, E. Kwon, S. C. Madden, M. Meixner, S. Hony, P. Panuzzo, M. Sauvage, J. Roman-Duval, K. D. Gordon, C. Engelbracht, F. P. Israel, K. Misselt, K. Okumura, A. Li, A. Bolatto, R. Skibba, F. Galliano, M. Matsuura, J.-P. Bernard, C. Bot, M. Galametz, A. Hughes, A. Kawamura, T. Onishi, D. Paradis, A. Poglitsch, W. T. Reach, T. Robitaille, M. Rubio, A. G. G. M. Tielens A&A 518 L75 (2010) DOI: 10.1051/0004-6361/201014645|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||23 Nov 2010 19:26|
|Last Modified:||26 Dec 2012 12:40|
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