PDA

View Full Version : Discussion: Cosmic Particle Accelerator at ...



Fraser
2005-Apr-08, 04:16 PM
SUMMARY: A vast looping structure 20 light-years across has been discovered near the heart of the Milky Way. The loop was found near a star forming region of our galaxy in the X-ray spectrum using the European Space Agency's XMM-Newton space telescope. Very high energy particles, usually only seen coming from pulsars or supernovae remnants, are streaming out of the object, so it could be working as a kind of natural particle accelerator.

View full article (http://www.universetoday.com/am/publish/cosmic_particle_accelerator.html)

What do you think about this story? Post your comments below.

iantresman
2005-Apr-08, 04:38 PM
So it reads like a particle accelerator, acts like a particle accelerator, and must be surrounded by intergalactic plasma….. which have been known to cause particles to accelerate, emit x-rays.

It's hard to find a more characteristic example of an electric current flowing through a plasma.

Regards,
Ian Tresman

lswinford
2005-Apr-08, 07:58 PM
We hear about gravity's effects from collapsing nebulosities to produce stars, to stars collapsing into black holes, perhaps in star clusters, and likely the major affective ingredient to galaxy formations. Sounds like magnetism needs further discussion, a sort of macromagnetism. The alternative is plasmas gravitationally bound, but over enormous distances, which sounds problematic. Even so, wouldn't the plasmas, bound however to a comparatively stable track, also generate enormously large magnetic fields or coordinating arrays to facilitate this observation? I would like to hear whether and how this affects the picture.

iantresman
2005-Apr-09, 10:39 AM
Originally posted by lswinford@Apr 8 2005, 07:58 PM
Sounds like magnetism needs further discussion, a sort of macromagnetism.
I think it needs to be recognised that wherever you see a magnetic field in a space plasma, there is an associated electric current. As Hannes Alfvén says in his book Cosmic Plasma (1981)
".. in magnetohydrodynamic theories, it is convenient to eliminate the current (i = current density) and to represent electric currents by curl B. This method is acceptable in the treatment of a number of phenomena.
However, there are also a number of phenomena which cannot be treated in this way, but which require an approach in which the electric current is taken account of explicitly."
In other words, it is electric currents that enable you to take a bigger picture view of magnetism, and an understanding of how electric current affect space plasmas will give you a better understanding of what is going on. More details can be found in another thread on Universe Today, see Electric Universe Model (http://www.universetoday.com/forum/index.php?showtopic=1919).

Regards,
Ian Tresman
Proponent, Electricity in Space (http://www.catastrophism.com/texts/electricity-in-space/index.htm)