کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1767624 1020198 2010 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Infrared studies of molecular shocks in the supernova remnant HB 21: II. Thermal admixture of shocked H2 gas in the south
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم فضا و نجوم
پیش نمایش صفحه اول مقاله
Infrared studies of molecular shocks in the supernova remnant HB 21: II. Thermal admixture of shocked H2 gas in the south
چکیده انگلیسی
We present near- and mid-infrared observations on the shock-cloud interaction region in the southern part of the supernova remnant HB 21, performed with the InfraRed Camera (IRC) aboard AKARI satellite and the Wide InfraRed Camera (WIRC) at the Palomar 5 m telescope. The IRC 4 μm (N4), 7 μm (S7), and 11 μm (S11) band images and the WIRC H2υ=1→0S(1) 2.12 μm image show similar diffuse features, around a shocked CO cloud. We analyzed the emission through comparison with the H2 line emission of several shock models. The IRC colors are well explained by the thermal admixture model of H2 gas - whose infinitesimal H2 column density has a power-law relation with the temperature T, dN∼T-bdT - with n(H2)∼3.9×104cm-3,b∼4.2, and N(H2;T>100K)∼2.8×1021cm-2. We interpreted these parameters with several different pictures of the shock-cloud interactions - multiple planar C-shocks, bow shocks, and shocked clumps - and discussed their weaknesses and strengths. The observed H2υ=1→0S(1) intensity is four times greater than the prediction from the power-law admixture model, the same tendency as found in the northern part of HB 21 (Paper I). We also explored the limitation of the thermal admixture model with respect to the derived model parameters.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Space Research - Volume 45, Issue 3, 1 February 2010, Pages 445-459
نویسندگان
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