PDA

View Full Version : Astronomers Discover a Supernova/Gamma Ray Burst Hybrid



Fraser
2008-Jul-26, 03:30 AM
Just when we thought we were beginning to understand what supernovae and gamma ray bursts were all about. Astronomers have just uncovered the true nature of what they thought was a regular supernova observed in January. At the time, it looked like a supernova emitting a 5-minute long burst of X-rays. But these X-rays were [...]

More... (http://www.universetoday.com/2008/07/25/astronomers-discover-a-supernovagamma-ray-burst-hybrid/)

trinitree88
2008-Jul-29, 08:54 PM
Just when we thought we were beginning to understand what supernovae and gamma ray bursts were all about. Astronomers have just uncovered the true nature of what they thought was a regular supernova observed in January. At the time, it looked like a supernova emitting a 5-minute long burst of X-rays. But these X-rays were [...]

More... (http://www.universetoday.com/2008/07/25/astronomers-discover-a-supernovagamma-ray-burst-hybrid/)


Fraser. I disagree. The work of Middleditch and al on supernova 1987a showed beaming with a collimation factor of ~ 10,000. So if you are viewing from an oblique angle only a trace of gamma rays, or gamma rays attenuated by Compton scattering, pair production, and photodissocciation of atomic/ionic species at the beam "collar" during the blast....x-rays....would be seen. More evidence for axisymmetric explosions, and the failure of simple inverse square law standard candles. Pete.