es111 Posted December 8, 2016 Share Posted December 8, 2016 In observational comsology how can we sure that the oberved objects (galaxies) are all distinct and not (for many ?) a different image of the same source via the gravitational lensing effect ? Thanks. ES111 Link to comment Share on other sites More sharing options...
swansont Posted December 8, 2016 Share Posted December 8, 2016 In observational comsology how can we sure that the oberved objects (galaxies) are all distinct and not (for many ?) a different image of the same source via the gravitational lensing effect ? Thanks. ES111 They have to be an image of the same thing to be a candidate for lensing. Galaxies with different different shapes would not be. Different spectral signatures, too. Different recession speeds/redshifts. Link to comment Share on other sites More sharing options...
AbstractDreamer Posted December 8, 2016 Share Posted December 8, 2016 (edited) Not only that, with anisotropic expansion around gravity wells, superluminal galactic recession velocities, local (peculiar) spacetime curvature and gravitational lensing; it is possible that some images are of the same galaxy but viewed from the complete opposite direction (relative to observer and object)!? Edited December 8, 2016 by AbstractDreamer Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now