Paradis, Déborah and Reach, William T. and Bernard, Jean-Philippe and Block, Miwa and Engelbracht, Chad W. and Gordon, Karl and Hora, Joseph L. and Indebetouw, Remy and Kawamura, Akiko and Meade, Marilyn and Meixner, Margaret and Sewilo, Marta and Vijh, Uma P. and Volk, Kevin (2009) Spatial Variations of Dust Abundances Across the Large Magellanic Cloud. Astronomical Journal, 138 (1). pp. 196-209. ISSN 0004-6256 http://resolver.caltech.edu/CaltechAUTHORS:20090911-094407161
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Using the data obtained with the Spitzer Space Telescope as part of the Surveying the Agents of a Galaxy's Evolution (SAGE) legacy survey, we have studied the variations of the dust composition and abundance across the Large Magellanic Cloud (LMC). Such variations are expected, as the explosive events which have lead to the formation of the many H I shells observed should have affected the dust properties. Using a model and comparing with a reference spectral energy distribution from our Galaxy, we deduce the relative abundance variations of small dust grains across the LMC. We examined the infrared color ratios as well as the relative abundances of very small grains (VSGs) and polycyclic aromatic hydrocarbons (PAHs) relative to the big grain abundance. Results show that each dust component could have different origins or evolution in the interstellar medium (ISM). The VSG abundance traces the star formation activity and could result from shattering of larger grains, whereas the PAH abundance increases around molecular clouds as well as in the stellar bar, where they could have been injected into the ISM during mass loss from old stars.
|Additional Information:||© 2009 The American Astronomical Society. Received 2009 February 13; accepted 2009 April 28; published 2009 June 1.|
|Subject Keywords:||dust, extinction; ISM: abundances; infrared: ISM; Magellanic Clouds|
|Official Citation:||Spatial Variations of Dust Abundances Across the Large Magellanic Cloud Déborah Paradis, William T. Reach, Jean-Philippe Bernard, Miwa Block, Chad W. Engelbracht, Karl Gordon, Joseph L. Hora, Remy Indebetouw, Akiko Kawamura, Marilyn Meade, Margaret Meixner, Marta Sewilo, Uma P. Vijh, and Kevin Volk 2009 The Astronomical Journal 138 196-209 doi: 10.1088/0004-6256/138/1/196.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||15 Sep 2009 15:49|
|Last Modified:||26 Dec 2012 11:21|
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