تقرير
A New Evolutionary Phase of Supernova Remnant 1987A
| العنوان: | A New Evolutionary Phase of Supernova Remnant 1987A |
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| المؤلفون: | Park, Sangwook, Zhekov, Svetozar A., Burrows, David N., Racusin, Judith L., Dewey, Daniel, McCray, Richard |
| سنة النشر: | 2011 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena |
| الوصف: | We have been monitoring the supernova remnant (SNR) 1987A with {\it Chandra} observations since 1999. Here we report on the latest change in the soft X-ray light curve of SNR 1987A. For the last $\sim$1.5 yr (since day $\sim$8000), the soft X-ray flux has significantly flattened, staying (within uncertainties) at $f_{\rm X}$ $\sim$ 5.7 $\times$ 10$^{-12}$ erg cm$^{-2}$ s$^{-1}$ (corresponding to $L_{\rm X}$ $\sim$ 3.6 $\times$ 10$^{36}$ erg s$^{-1}$) in the 0.5--2 keV band. This remarkable change in the recent soft X-ray light curve suggests that the forward shock is now interacting with a decreasing density structure, after interacting with an increasing density gradient over $\sim$10 yr prior to day $\sim$8000. Possibilities may include the case that the shock is now propagating beyond a density peak of the inner ring. We briefly discuss some possible implications on the nature of the progenitor and the future prospects of our {\it Chandra} monitoring observations. Comment: 11 pages, 2 tables, 1 color figure, Accepted by ApJ Letters |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/2041-8205/733/2/L35 |
| الوصول الحر: | http://arxiv.org/abs/1104.4825Test |
| رقم الانضمام: | edsarx.1104.4825 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/2041-8205/733/2/L35 |
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