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SA4590661.pdf250.41 kB
titleSpectral Energy Diasributions of Dusty Galaxies
Author(eng)Toshinobu, TAKAGI; Vladas, VANSEVICIUS; Nobuo, ARIMOTO
Author Affiliation(eng)Department of Physics, Rikkyo University; Institute of Physics; Institute of Astronomy, School of Science, University of Tokyo
Issue Date2000-12
PublisherInstitute of Space and Astronautical Science
Publication titleThe Institute of Space and Astronautical Science repot. S.P.
Start page155
End page162
Publication date2000-12
AbstractWe present a model of spectral energy distributions (SEDs). This model employstwo processes of dust heating: heating by radiation and heating by hot gas. The radiation fieldsand the resulting SEDs are calculated by a software code that treats the radiative transfer byassuming spherical symmetry. Using a dust model with a mixture of graphite, silicate and PAHs,we reproduce the standard extinction curve and the spectrum of the cirrus emission in the Galaxy.The temperature fluctuation of dust particles is taken into account wherever the enthalpy of a dustparticle that corresponds to the equilibrium temperature in a given radiation field is less than theenergy of one UV photon.We derived the SEDs of a starburst galaxy (M82), an elliptical galaxy (NGC2768) and a cluster ofgalaxies (the Coma cluster). The derived age of M82 is 500 Myr when the V-band optical depth,γv, is 3.5. In the optically thin case, such as NGC2768, the spatial distribution of dust in thegalaxy is derived from the SED fitting, by fixing the size of galaxy. We conclude that the spatialdistribution of dust is the same as that of stars in NGC2768. The 120 μm emission from theComa cluster detected by ISO is reproduced by the model with γv = 0.002. It is found that dustparticles in the intracluster space is mainly heated by the hot X-ray emitting gas, although theheating by the intracluster radiation field is important for the spectrum at the submillimeter andlonger wavelengths.
Document TypeDepartmental Bulletin Paper
JAXA Category宇宙科学研究所

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