Spectral Energy Diasributions of Dusty Galaxies

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概要

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• We 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.

• 宇宙航空研究開発機構の論文

著者

• Arimoto N

  National Astronomical Observatory

• Nobuo Arimoto

  Institute Of Astronomy University Of Tokyo

• Toshinobu Takagi

  Department Of Physics Rikkyo University

• Vladas VANSEVICIUS

  Institute of Physics

関連論文

• Chemical Abundances in the Secondary Star of the Black Hole Binary V4641 Sagittarii (SAX J1819.3-2525)
• Enrichment of heavy elements in the red giant S 15-19 in the Sextans dwarf spheroidal galaxy (Special issue: Exploring the universe with the Subaru Telescope: from galaxies to the solar system)
• New Photometric Data of Old Open Clusters in the Anti-Galactic Center Region
• First Determination of the Actinide Thorium Abundance for a Red Giant of the Ursa Minor Dwarf Galaxy
• Subaru/HDS Abundances in Three Giant Stars in the Ursa Minor Dwarf Spheroidal Galaxy
• Subaru/HDS Abundances in Three Giant Stars in the Ursa Minor Dwarf Spheroidal Galaxy
• Far-Infrared Emission of Intracluster Dust (ICD)
• Sixteen-Color Photometry of Galaxy Cluster Abell 566
• Spectral Energy Diasributions of Dusty Galaxies
• Why Can We Detect the High-Redshift Quasar BR 1202-0725 in CO?
• Enrichment of Heavy Elements in the Red Giant S 15-19 in the Sextans Dwarf Spheroidal Galaxy
• Mid-infrared Studies of the AGB Star Populations in the Local Group Galaxies : the Magellanic Clouds

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