Inverse temperature dependence of the dust submillimeter spectral index

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dc.creatorDupac, X.
dc.creatorBernard, J. -P.
dc.creatorBoudet, N.
dc.creatorGiard, M.
dc.creatorLamarre, J. -M.
dc.creatorMény, C.
dc.creatorPajot, F.
dc.creatorRistorcelli, I.
dc.date2003-10-03
dc.date.accessioned2026-07-07T02:09:58Z
dc.date.available2026-07-07T02:09:58Z
dc.descriptionWe present here a compilation of PRONAOS-based results concerning the temperature dependence of the dust submillimeter spectral index, including data from Galactic cirrus, star-forming regions and a circumstellar envelope. We observe large variations of the spectral index (from 0.8 to 2.4) in a wide range of temperatures (12 to 80 K). These spectral index variations follow a hyperbolic-shaped function of the temperature, large spectral indices (1.5-2.4) being observed in cold regions (12-20 K) while small indices (0.8-1.6) are observed in warm regions (35-80 K). Three interpretations are proposed: one is that the grain sizes change in warm and rather dense environments, another is that the chemical composition of the grains is not the same in different environments, a third one is that there is an intrinsic dependence of the dust spectral index on the temperature due to quantum processes.
dc.description2 pages, 1 figure, proc. of the SF2A conf. held in Bordeaux, France, June 2003, eds.: F. Combes, D. Barret and T. Contini, EdP-Sciences Conf. Series, p. 97
dc.identifierhttps://arxiv.org/abs/astro-ph/0310091
dc.identifierhttp://arxiv.org/abs/astro-ph/0310091
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/6633
dc.subjectAstrophysics
dc.titleInverse temperature dependence of the dust submillimeter spectral index
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