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Title:
Far-infrared dust properties in the Galaxy and the Magellanic Clouds
Authors:
Hirashita, Hiroyuki; Hibi, Yasunori; Shibai, Hiroshi
Affiliation:
AA(Centre for Computational Sciences, University of Tsukuba, Tsukuba 305-8577, Japan), AB(Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan), AC(Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 379, Issue 3, pp. 974-984. (MNRAS Homepage)
Publication Date:
08/2007
Origin:
MNRAS
MNRAS Keywords:
dust, extinction, Galaxy: stellar content, galaxies: ISM, Magellanic Clouds, infrared: galaxies, infrared: ISM
DOI:
10.1111/j.1365-2966.2007.11745.x
Bibliographic Code:
2007MNRAS.379..974H

Abstract

A recent data analysis of the far-infrared (FIR) map of the Galaxy and the Magellanic Clouds has shown that there is a tight correlation between two FIR colours: the 60-100 and 100-140μm colours. This FIR colour relation called `main correlation' can be interpreted as indicative of a sequence of various interstellar radiation fields with a common FIR optical property of grains. In this paper, we constrain the FIR optical properties of grains by comparing the calculated FIR colours with the observational main correlation. We show that neither of the `standard' grain species (i.e. astronomical silicate and graphite grains) reproduces the main correlation. However, if the emissivity index at 100 <~ λ <~ 200μm is changed to ~=1-1.5 (not ~=2 as the above two species), the main correlation can be successfully explained. Thus, we propose that the FIR emissivity index is ~=1-1.5 for the dust in the Galaxy and the Magellanic Clouds at 100 <~ λ <~ 200μm. We also consider the origin of the minor correlation called `subcorrelation', which can be used to estimate the Galactic star formation rate.
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