کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10695926 | 1020285 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Gamma-ray observations of explosive nucleosynthesis products
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
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چکیده انگلیسی
The γ-ray line emission from 44Ti has so far only been detected from the supernova remnant Cas A. I discuss these detections, which were made by COMPTEL (the 1157 keV line) and BeppoSAX (the 68 and 78 keV lines), which, combined, give a flux of (2.6 ± 0.4 ± 0.5) Ã 10â5 ph cmâ2 sâ1 per line, suggesting a 44Ti yield of (1.5 ± 1.0) Ã 10â4Mâ. Moreover, I present some preliminary results of Cas A observations by INTEGRAL, which so far has yielded a 3Ï detection of the 68 keV line with the ISGRI instrument with a flux that is consistent with the BeppoSAX detections. Future observations by INTEGRAL-ISGRI will be able to constrain the continuum flux above 90 keV, as the uncertainty about the continuum shape, is the main source of systematic error for the 68 and 78 keV line flux measurements. Moreover, with the INTEGRAL-SPI instrument it will be possible to measure or constrain the line broadening of the 1157 keV line. A preliminary analysis of the available data indicates that narrow line emission (i.e., Îv < 1000 km sâ1) can be almost excluded at the 2Ï level, for an assumed line flux of 1.9 Ã 10â5 ph cmâ2 sâ1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Space Research - Volume 35, Issue 6, 2005, Pages 976-986
Journal: Advances in Space Research - Volume 35, Issue 6, 2005, Pages 976-986
نویسندگان
Jacco Vink,