Black Hole Suns
Black Hole Suns
Laying in bed the other night I had a random thought: Shouldn't black holes have halos (actually spheres of light, but halos from any one perspective) as light the just grazes the event horizon escapes in a sort of hyperbolic arc? Black holes wouldn't be invisible if this were true, and it seems to me it should be, but would have bright 'rings' or 'halos' of light at the edge of the event horizon.
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Re: Black Hole Suns
For it to have a visible halo, brighter than the background, the light would need to be focused in some way. There's nothing I can think of that would do that. I would think that any light that escaped would be scattered in completely random fashion.
I do remember reading that when a giant gas cloud falls into a black hole, it gives off an extremely powerful burst of light as it is accelerated to close to the speed of light, and that that has been seen and used to confirm the existence of the black hole.
I do remember reading that when a giant gas cloud falls into a black hole, it gives off an extremely powerful burst of light as it is accelerated to close to the speed of light, and that that has been seen and used to confirm the existence of the black hole.
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Re: Black Hole Suns
The idea of gravitational lensing may be relevant here: http://en.wikipedia.org/wiki/Gravitational_lenses
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Re: Black Hole Suns
Actually, what happened about the super massive black hole gas cloud thing this summer? I heard loads beforehand about the scientists excitedly looking forward to it, but nothing about the event or any images.
[Disclaimer - if this is comes across like I think I know what I'm talking about, I want to make it clear that I don't. I'm just trying to get my thoughts down]
Re: Black Hole Suns
That's exactly what I was thinking. I'm only some 80 years late on the theory.JimC wrote:The idea of gravitational lensing may be relevant here: http://en.wikipedia.org/wiki/Gravitational_lenses
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Re: Black Hole Suns
Your idea makes sense, but where is this light source coming from? I wouldn't think the collection of stars behind a black hole would make enough light to cause a halo.
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Re: Black Hole Suns
Hawking Radiation.mistermack wrote: I do remember reading that when a giant gas cloud falls into a black hole, it gives off an extremely powerful burst of light as it is accelerated to close to the speed of light, and that that has been seen and used to confirm the existence of the black hole.
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Re: Black Hole Suns
A galaxy directly behind can produce the effect...rEvolutionist wrote:Your idea makes sense, but where is this light source coming from? I wouldn't think the collection of stars behind a black hole would make enough light to cause a halo.
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Re: Black Hole Suns
No, rEv. Hawking radiation is an odd quantum phenomenon, to do with the production of particle pairs from empty space; when this happens just beyond the event horizon, it has the effect of very slowly decreasing the mass/energy of the black hole. It would be very weak in comparison to gravitational lensing.rEvolutionist wrote:Hawking Radiation.mistermack wrote: I do remember reading that when a giant gas cloud falls into a black hole, it gives off an extremely powerful burst of light as it is accelerated to close to the speed of light, and that that has been seen and used to confirm the existence of the black hole.
http://en.wikipedia.org/wiki/Hawking_radiation
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Re: Black Hole Suns
I don't think mm was referring to gravitational lensing. Perhaps he was right, though. I think I've heard accounts of black holes and/or neutron stars etc stripping the gas of nearby stars. I guess when the gas accelerates enough, it probably turns to some sort of plasma and emits a lot of radiation.
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Re: Black Hole Suns
I don't think that gravitational lensing qualifies for what Făkünamę described in the op.
It's a lens effect, caused by the progressive bending of spacetime, around an extremely massive object, like a galaxy cluster or super super massive black hole, or summat simliar. So it doesn't cause a halo effect around a black hole from any direction, it just produces false images of bright objects that are perfectly in line with the observer and the massive object.
For a black hole to have a halo of light, that just evaded being sucked in, you would need a lot of very bright light sources, very close to it, and they would drown out any halo effect, even if it existed.
Looking backwards at it, if you tracked the light back to the black hole, there would need to be some kind of focussing effect, of most or all of the available light being concentrated to a small area around the black hole, and then released into space to be observed. I don't think there's any mechanism for that.
It's a lens effect, caused by the progressive bending of spacetime, around an extremely massive object, like a galaxy cluster or super super massive black hole, or summat simliar. So it doesn't cause a halo effect around a black hole from any direction, it just produces false images of bright objects that are perfectly in line with the observer and the massive object.
For a black hole to have a halo of light, that just evaded being sucked in, you would need a lot of very bright light sources, very close to it, and they would drown out any halo effect, even if it existed.
Looking backwards at it, if you tracked the light back to the black hole, there would need to be some kind of focussing effect, of most or all of the available light being concentrated to a small area around the black hole, and then released into space to be observed. I don't think there's any mechanism for that.
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Re: Black Hole Suns
I think gravitational lensing is EXACTLY what Făkünamę described in the OP.
But there would have to be a fairly bright light source behind the black hole for it to be noticable.
Check out these images of gravitational lensing:
http://apod.nasa.gov/apod/ap130917.html
http://apod.nasa.gov/apod/ap111221.html
http://apod.nasa.gov/apod/ap111017.html
http://apod.nasa.gov/apod/ap100620.html
But there would have to be a fairly bright light source behind the black hole for it to be noticable.
Check out these images of gravitational lensing:
http://apod.nasa.gov/apod/ap130917.html
http://apod.nasa.gov/apod/ap111221.html
http://apod.nasa.gov/apod/ap111017.html
http://apod.nasa.gov/apod/ap100620.html
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Re: Black Hole Suns
Wouldn't the light that approached so close to the even horizon become deeply red shifted?
Gravitational lensing can happen over inter galactic distances and a black hole is not required and certainly wouldn't result in a halo.
Gravitational lensing can happen over inter galactic distances and a black hole is not required and certainly wouldn't result in a halo.
Re: Black Hole Suns
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Re: Black Hole Suns
Lol! Unintentional double entendre.
Libertarianism: The belief that out of all the terrible things governments can do, helping people is the absolute worst.
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