Low-temperature optical properties of silicate particles in the far-infrared region

被引:42
作者
Chihara, H
Koike, C
Tsuchiyama, A
机构
[1] Osaka Univ, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan
[2] Kyoto Pharmaceut Univ, Kyoto 6078412, Japan
关键词
crystalline silicate; ISM; dust; extinction; ISM : lines and bands; laboratory experiment; line : profiles;
D O I
10.1093/pasj/53.2.243
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The far-infrared absorption spectra of crystalline circumstellar dust analogues (orthoenstatite? clinoenstatite, diopside, and forsterite) were measured at room temperature (295 K) and liquid-helium temperature (4.2 K). The wavelength ranges of the measurements were 20-80 mum and 30-80 Irm at 295 K and 4.2 K, respectively. The absorption bands were detected very clearly not only at room temperature, but also at liquid-helium temperature. The temperature effects were clearly observed at liquid-helium temperature, such as (1) an increase in the spectral index of the continuum, (2) an enhancement in the absorption band strength, (3) a decrease in the band width, and (4) the absorption peaks of all bands of all samples shifted toward a shorter wavelength. These re suits suggest that a reconsideration of the identification should be required for some absorption bands which have been recognized as unidentified bands because of a disagreement in the peak position between the observed data and the laboratory data obtained at room temperature. Our experimental data can be obtained from the web-site (http://www.kyoto-phu.ac.jp/labo/butsuri/).
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页码:243 / 250
页数:8
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