منابع مشابه
The 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 کاملNon-thermal X-ray and Radio Emission from the Snr N 157b
The supernova remnant N 157B contains a pulsar and three distinct synchrotron components with rather unusual properties. 1) A somewhat irregular elliptical pulsar wind nebula (PWN) visible in both X-ray and radio wavelengths. The nebula is quite symmetrical with an extent of about 10 × 5 parsecs but offset along the long axis by about 4 pc from the pulsar position. It is apparently the result o...
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...
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 ...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1994
ISSN: 0252-9211
DOI: 10.1017/s025292110007812x