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