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Oscar01
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Hi there. Have been doing some informant l independent research on gravitational lensing. It turns out that all einstein runs are blue. Why Is this?
I don't think all Einstein rings are blue. But far-away galaxies tend to be intrinsically bluer than nearby ones, as galaxies in the early universe were younger and had a lot more star formation. More star formation means a higher abundance of massive stars, and massive stars tend to be both bluer and brighter.Oscar01 said:Hi there. Have been doing some informant l independent research on gravitational lensing. It turns out that all einstein runs are blue. Why Is this?
Skimming the paper, I don't think it's saying this. Rather, they're proposing a novel modification of General Relativity that makes Einstein rings blue. I'm not confident that this modification is necessary or that there is evidence for it.Chronos said:Upon further investigation, I found it is not an effect related to imaging processing nor to the color of galaxies. As usual truth is stranger than fiction as discussed here: http://www.iaeng.org/IJAM/issues_v41/issue_3/IJAM_41_3_02.pdf
Chalnoth said:I don't think all Einstein rings are blue.
No doubt. I really think it's down to these being predominantly young galaxies, but I have had a hard time coming up with any good sources for this.Drakkith said:I agree. A cursory examination of google images showed several that appeared distinctly yellow. However, I will say that most of them appeared to be blue though.
That's the same article that's linked above. It doesn't provide actual evidence (e.g. spectra), just a general statement that Einstein rings tend to be blue. It's a purely theoretical paper, which is fine. But it doesn't count as a solid explanation without confirming evidence.Oscar01 said:No they are blue unless redshifted. otherwise always blue as is described in this paper that makes an attempt at answering why. http://arrow.dit.ie/engscheleart2/19/
There seems to be no good theory as to why though.
Chronos said:I assume you realize colorization of images is purely a dramatic effect..
Chalnoth said:I don't think all Einstein rings are blue. But far-away galaxies tend to be intrinsically bluer than nearby ones, as galaxies in the early universe were younger and had a lot more star formation. More star formation means a higher abundance of massive stars, and massive stars tend to be both bluer and brighter.
Drakkith said:I agree. A cursory examination of google images showed several that appeared distinctly yellow. However, I will say that most of them appeared to be blue though.
Oscar01 said:It seems to me odd that there wouldn't be considering the whole theory behind gravitational lensing rest son the absence of chromatic abberation, which doesn't appear to be the case as far as i can see.
Drakkith said:Seems to me that you can see it right in the pictures of all gravitationally lensed objects. We don't see different colors being focused at different ranges like a normal chromatic aberration. The only thing odd here is that some gravitationally lensed objects appear to be bluer than they should be.
Oscar01 said:the fact that nearly all Einstein rings are blue
Gravitational lensing is a phenomenon in which the gravitational force of a massive object, such as a galaxy or cluster of galaxies, bends and distorts the path of light from a distant object behind it. This creates a visual effect similar to a lens, hence the name "gravitational lensing".
According to Einstein's theory of general relativity, mass and energy can warp the fabric of space-time, causing objects to follow curved paths. When light passes through this warped space, its path is also bent, similar to how a glass lens can bend light. In the case of gravitational lensing, the massive object acts as the lens, bending and magnifying the light from the distant object behind it.
"Einstein's Blue Run Mystery" refers to an observation made by astronomers in the 1980s, in which a distant quasar appeared to have a blue streak of light running through it. This was initially unexplained until it was determined that the blue streak was actually a result of gravitational lensing by a massive galaxy located between the quasar and Earth. This observation provided evidence for the existence of dark matter, which is responsible for the bending of light in gravitational lensing.
Gravitational lensing allows us to study the distribution of mass in the universe, including dark matter, which cannot be directly observed. It also allows us to study the properties of distant galaxies and objects, as the lensing effect can magnify and distort their light, providing a clearer view. Additionally, gravitational lensing can help us measure the expansion rate of the universe and test theories of gravity.
Gravitational lensing has numerous practical applications in astronomy. It can be used to detect and study distant objects that would otherwise be too faint to see, such as galaxies and quasars. It can also help astronomers map the distribution of dark matter in the universe and study the formation and evolution of galaxies. Gravitational lensing can also be used to measure the mass of distant objects, providing valuable information for understanding the structure of the universe.