Sub-millimeter to centimeter excess emission from the Magellanic Clouds. I. Global spectral energy distribution - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: In order to reconstruct the global SEDs of the Magellanic Clouds over eightdecades in spectral range, we combined literature flux densities representingthe entire LMC and SMC respectively, and complemented these with maps extractedfrom the WMAP and COBE databases covering the missing the 23-90 GHz 13-3.2mm and the poorly sampled 1.25-250 THz 240-1.25 micron. We have discovereda pronounced excess of emission from both Magellanic Clouds, but especially theSMC, at millimeter and sub-millimeter wavelengths. We also determined accuratethermal radio fluxes and very low global extinctions for both LMC and SMC.Possible explanations are briefly considered but as long as the nature of theexcess emission is unknown, the total dust masses and gas-to-dust ratios of theMagellanic Clouds cannot reliably be determined.



Autor: F.P. Israel, W.F. Wall, D. Raban, W.T. Reach, C. Bot, J.B.R. Oonk, N. Ysard, J.P.Bernard

Fuente: https://arxiv.org/







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