ATTENTION: The Boards will be closed permanently on May 28th, 2014. Posting will be disabled on April 28th, 2014. More Info

X-Rays Escape Blackhole at Half the Speed of Light

caltrek

GROUP: Members

POSTS: 0

Report this Feb. 26 2009, 9:11 pm

Quote (lanceromega @ Feb. 10 2009, 2:19 pm)
Quote (draeden06 @ Feb. 09 2009, 1:35 pm)
Question: Why are the x-rays going so slow? Don't all forms of EM waves travel at the speed of light? Is it the denisty of material around the BH, or is the gravity of the BH slowing down, or is it something else?

x ?rays are traveling at the speed of light it the plasma that traveling at 50% of C.

Not having visited any black holes lately, I have to confess to a profound ignorance of the physics involved. I do have a few questions. I thought that gravity can bend light. If gravity can bend light then can't it slow light in the sense that it can cause light to travel a farther distance?

It is my understanding that nothing escapes beyond the event horizon (per Stephen Hawkings) but that at the event horizon it is still possible for x-rays (or was it something at another frequency?) to escape. Is that correct?

Also, one might be able to devise mechanisms to "surf" the waves of energy near (but not inside) a black hole, but wouldn't it be highly problematic to keep a human being alive under those gravitational stresses?

lanceromega

GROUP: Members

POSTS: 3859

Report this Feb. 27 2009, 10:33 am

Quote (GrandLunar2007 @ Feb. 25 2009, 11:53 am)
Dryson,

By central black hole, it means the black hole at the center of that galaxy, not the black hole's center itself.

The energy is emitted before the matter passes the event horizon. It is past the event horizon that energy, or light, cannot escape from.

There are articles online that talk about details like this. There are also books that explain.
If there is a library near you, I encourage you to look for one called "Death by Black Hole", by Dr. Neil Tyson.
That can give you more info about the phenomenon of relativistic jets.

once again Dryson is showing that he just doesnot understand the material that he is posting... Sad really :blush:

lanceromega

GROUP: Members

POSTS: 3859

Report this Feb. 27 2009, 10:54 am

Quote (caltrek @ Feb. 25 2009, 10:11 pm)
Quote (lanceromega @ Feb. 10 2009, 2:19 pm)
Quote (draeden06 @ Feb. 09 2009, 1:35 pm)
Question: Why are the x-rays going so slow? Don't all forms of EM waves travel at the speed of light? Is it the denisty of material around the BH, or is the gravity of the BH slowing down, or is it something else?

x ?rays are traveling at the speed of light it the plasma that traveling at 50% of C.

Not having visited any black holes lately, I have to confess to a profound ignorance of the physics involved. I do have a few questions. I thought that gravity can bend light. If gravity can bend light then can't it slow light in the sense that it can cause light to travel a farther distance?

It is my understanding that nothing escapes beyond the event horizon (per Stephen Hawkings) but that at the event horizon it is still possible for x-rays (or was it something at another frequency?) to escape. Is that correct?

Also, one might be able to devise mechanisms to "surf" the waves of energy near (but not inside) a black hole, but wouldn't it be highly problematic to keep a human being alive under those gravitational stresses?

Blackhole donot really bend light, what it does is alter the null path ( the path that a photon travels that requires mininum or no energy). Is done by the warping of space time.

Due to the velocity that a photon travel at © it doesnot experience the passage of time, to a photon it exist in  all point of the universe it has and would have travelled. So in a sense it cannot cause it really everywhere it has and could have travelled.

It hard to understand, but if the photon velocity was even a bit lower than C we would actually see it oscillating between a particle called a B Boson ( which has most of the properties of the Photon ) and a Z Boson ( the neutral particle of the weak force), very much in the way a neutrino oscillates between the various types (electron, Muon, and Tau).

AS for escaping the horizon, this has become a big agruement in physics. According to Relativity, nothing can, space would be so warp that escape velocity would be greater than C.
But in Quantum mechanics you could due to Quantum tunneling, particle that do this is called Hawking radiation.

But Also Quantum theory demands that information should be able to be access even if it on the other side of the horizon. This let to a debate that still going on today, called the Black hole Wars. Stephen Hawking was formely the leader of the camp that said it cannot , but now stating that if can. But the answer will most likely not be found to till a working theory of Quantum Gravity is created.

To note Hawking radiation for a Blackhole the size of the one in the Galactic Center is very close to none at all. Large holes radiate little, while smaller ones ( mini or micro holes) would radiate hotter than stars and then explode..

You could use a Blackhole to generate energy by Gravitional  sling shot as long as the path of the space craft remains outside the radiate of egrosphere ( the point where the orbital velocity of The Blackhole is the speed of light)

Recently logged in

Users browsing this forum: 22123magic

Forum Permissions

You cannot post new topics in this forum

You cannot reply to topics in this forum

You cannot delete posts in this forum