期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
卷 63, 期 5, 页码 L43-L47出版社
OXFORD UNIV PRESS
DOI: 10.1093/pasj/63.5.L43
关键词
alignment mechanism; ISM: dust, extinction; polarization
资金
- Okayama Astrophysical Observatory of NAOJ, NINS [08A-S01]
- Kagawa University [FY2008]
We have investigated the efficiency of interstellar polarization, p(gimel)/A(gimel), where p(gimel). is the fractional linear polarization and A(gimel) is the extinction, in 14 lines of sight as a function of the wavelength, gimel. We used the data of lines of sight to the Pleiades cluster obtained with the low-dispersion spectropolarimeter HBS as well as those in literature. It has been found that the polarization efficiency, p(gimel)/A(gimel), is proportional to exp (-beta/gimel) in wavelength,) gimel approximate to 0.4-0.8 mu m, where beta is a parameter that varies from 0.5 to 1.2 mu m. We find that beta is negatively correlated with the dust temperature deduced from infrared data by Schlegel et al. (1998, ApJ, 500, 525), suggesting that the polarization efficiency is higher in short wavelengths for higher temperature. According to the alignment theory by radiative torques (RATs), if the radiation is stronger, RATs will make small grains align better, and the polarization efficiency will increase at short wavelengths. Our finding of the correlation between beta and the temperature is consistent with what is expected with the alignment mechanism by RATs.
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