منابع مشابه
Probing Elemental Abundances in Snr 1987a Using Xmm-newton
We report on the latest (2007 Jan) observations of supernova remnant (SNR) 1987A from the XMM-Newton mission. Since the 2003 May observations of Haberl et al. (2006), 11 emission lines have experienced increases in flux by factors ∼ 3 to 10 (6 ± 0.6 on average), with the 775 eV line of O viii showing the greatest increase. Overall, we are able to make Gaussian fits to 17 emission lines in the R...
متن کاملThe Reverse Shock of SNR 1987A
The reverse shock of supernova remnant (SNR) 1987A emits in Hα and Lyα , and comes in two flavors: surface and interior. The former is due to direct, impact excitation of hydrogen atoms crossing the shock, while the latter is the result of charge transfer reactions between these atoms and slower, post-shock ions. Interior and surface emission are analogous to the broadand narrow-line components...
متن کاملDust-Gas Interaction in SNR 1987A
Multiwavelength observations of SNR 1987A show that its morphology is rapidly changing at X-ray, radio, and optical wavelengths as the blast wave from the explosion expands into the circumstellar equatorial ring. Infrared emission arises from the interaction of dust grains with the hot X-ray emitting gas. We show that the IR emission provides important complementary information on the interacti...
متن کاملEvolutionary Status of Snr 1987a at the Age of Eighteen
Approximately 18 yr after the supernova explosion, the blast wave of SNR 1987A is entering the main body of the equatorial circumstellar material, which is causing a dramatic brightening of the remnant. We recently reported observational evidence for this event from ourChandra data (the work published in 2005November by Park et al.). We present here the temporal evolution of the X-ray-emitting ...
متن کاملX-ray Evolution of SNR 1987A: The Radial Expansion
We present the evolution of the radial expansion of SNR 1987A as measured using Chandra X-ray observations taken over the last 10 years. To characterize the complex structure of the remnant and isolate the expansion measurement, we fit the images to several empirical models including: a simple circular torus, a torus with bilateral lobes, and a torus with four tangentially extended lobes. We di...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2012
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201220595