کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10694373 | 1020039 | 2013 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Comptonization efficiencies of the variability classes of GRS 1915Â +Â 105
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Comptonization efficiencies of the variability classes of GRS 1915Â +Â 105 Comptonization efficiencies of the variability classes of GRS 1915Â +Â 105](/preview/png/10694373.png)
چکیده انگلیسی
The Galactic microquasar GRS 1915Â +Â 105 exhibits at least seventeen types of variability classes. Intra and inter class transitions are reported to be observed within seconds to hours. Since the observation was not continuous, these classes appeared to be exhibited in a random order. Our goal is to predict a sequence of these classes. In this paper, we compute the ratio of the photon counts obtained from the power-law component and the blackbody component of each class and call this ratio as the 'Comptonizing efficiency' (CE) of that class. We sequence the classes in the ascending order of CE and find that this sequence matches with a few class transitions observed by RXTE satellite and IXAE instruments on board IRS-P3. A change in CE corresponds to a change in the optical depth of the Compton cloud. Our result implies that the optical depth of the Compton cloud gradually rises as the variability class becomes harder.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Space Research - Volume 52, Issue 4, 15 August 2013, Pages 740-759
Journal: Advances in Space Research - Volume 52, Issue 4, 15 August 2013, Pages 740-759
نویسندگان
Partha Sarathi Pal, Sandip K. Chakrabarti, Anuj Nandi,