PDA

View Full Version : Pulsars are Exploding Unexpectedly and "Magnetars" Might be to Blame



Fraser
2008-Feb-22, 05:00 AM
Pulsars are fast-spinning, highly radiating neutron stars. Most pulsars emit radio, X-ray and gamma radiation at regular intervals (usually periods of a few milliseconds to a few seconds), in fact many pulses keep the accuracy of the most accurate atomic clocks on Earth. However, occasionally, these rapidly rotating bodies undergo a violent change, blasting massive [...]

More... (http://www.universetoday.com/2008/02/21/pulsars-are-exploding-unexpectedly-and-magnetars-might-be-to-blame/)

BigDon
2008-Feb-22, 05:09 AM
Mr. Cain I believe the author is doing science a disservice by using the word "Sun", capitalized, when he means to use the word "star".

trinitree88
2008-Feb-23, 09:00 PM
Pulsars are fast-spinning, highly radiating neutron stars. Most pulsars emit radio, X-ray and gamma radiation at regular intervals (usually periods of a few milliseconds to a few seconds), in fact many pulses keep the accuracy of the most accurate atomic clocks on Earth. However, occasionally, these rapidly rotating bodies undergo a violent change, blasting massive [...]

More... (http://www.universetoday.com/2008/02/21/pulsars-are-exploding-unexpectedly-and-magnetars-might-be-to-blame/)

Fraser. One of the things I hope to mitigate is the oft-quoted "empty space" expression. While it is true that space in high Earth orbit is a pretty good vacuum, concerns over starships running into gas/dust/ micrometeors, and worse are real. Pulsars are not static spinning orbs, but are usually birthed with a kick velocity(typical velocities run a few tens to a few hundred km/sec). They are going to run into things here and there. Small things will not be very noticeable, but a small asteroid striking a pulsar at say 50 km/sec...that will release a burst of energy. So the ability for them to emit radiation is not confined to internal starquakes. pete

Jerry
2008-Feb-24, 11:48 PM
The rotation of the pulsar is also slowing down, suggesting a high magnetic field may be braking its rotation.

These findings are significant, as it suggests that pulsars and magnetars may be the same creature, just at different periods of a pulsars lifetime, and not two entirely different classes of neutron starů
The best evidence of gravitational waves is/was the braking energy budget of neutron stars. If it is now apparent magnetic fields are stripping out energy, the supportive body of evidence of Einstein's theory of gravity is considerably weakened.

korjik
2008-Feb-25, 01:34 AM
The best evidence of gravitational waves is/was the braking energy budget of neutron stars. If it is now apparent magnetic fields are stripping out energy, the supportive body of evidence of Einstein's theory of gravity is considerably weakened.

Considering that the two effects you are talking about are completely separate, I would say that chances are you are wrong.