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Submillimeter to centimeter excess emission from the Magellanic Clouds - I. Global spectral energy distribution

Israel, F. P. and Wall, W. F. and Raban, D. and Reach, W. T. and Bot, C. and Oonk, J. B. R. and Ysard, N. and Bernard, J. P. (2010) Submillimeter to centimeter excess emission from the Magellanic Clouds - I. Global spectral energy distribution. Astronomy and Astrophysics, 519 . A67. ISSN 0004-6361. http://resolver.caltech.edu/CaltechAUTHORS:20101117-104304583

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Abstract

Aims. Our goal is to determine and study the global emission from the Magellanic Clouds over the full radio to ultraviolet spectral range. Methods. We have selected from the literature those flux densities that include the entire LMC and SMC respectively, and we have complemented these with maps extracted from the WMAP and COBE databases covering the missing 23–90 GHz (13–3.2 mm) and the poorly sampled 1.25–250 THz (240–1.25 μm) spectral ranges in order to reconstruct the global SEDs of the Magellanic Clouds over eight decades in frequency or wavelength. Results. A major result is the discovery of a pronounced excess of emission from the Magellanic Clouds at millimeter and submillimeter wavelengths. We also confirm global mid-infrared (12 μm) emission suppression, and determine accurate thermal radio fluxes and very low global extinctions for both LMC and SMC, the latter being the most extreme in all these respects. Conclusions. These and other dust properties such as the far-UV extinction curve appear to be correlated with (low) metallicity. Possible explanations are briefly considered. As long as the nature of the excess emission is unknown, the total dust masses and gas-to-dust ratios of the Magellanic Clouds cannot reliably be determined


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1051/0004-6361/201014073DOIArticle
http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201014073&Itemid=129PublisherArticle
ORCID:
AuthorORCID
Reach, W. T.0000-0001-8362-4094
Additional Information:© 2010 ESO. Received 15 January 2010; Accepted 14 May 2010; Published online 14 September 2010.
Subject Keywords:submillimeter: galaxies; radio continuum: galaxies; infrared: galaxies; Magellanic Clouds; galaxies: individual: Magellanic Clouds; dust, extinction
Record Number:CaltechAUTHORS:20101117-104304583
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20101117-104304583
Official Citation:Submillimeter to centimeter excess emission from the Magellanic Clouds - I. Global spectral energy distribution F. P. Israel, W. F. Wall, D. Raban, W. T. Reach, C. Bot, J. B. R. Oonk, N. Ysard and J. P. Bernard A&A 519 A67 (2010) DOI: 10.1051/0004-6361/201014073
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20856
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:17 Nov 2010 19:28
Last Modified:02 Mar 2017 04:11

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