dlzc wrote:
Dear Mike Dworetsky:

On Friday, September 21, 2012 12:41:49 AM UTC-7, Mike Dworetsky wrote:
...
As the object is visible only because it is
gravitationally lensed (hence looks much brighter
than it would otherwise appear) all the other
objects in the field are either nearer galaxies or
foreground stars in our galaxy.

When an object of some "standard" size, is located in a much smaller
Universe, the image travels out into an expanded Universe, the
original object appears magnified... but it was expansion that did
it, not gravitation, right? Objects don't stretch with the
"balloon", but the image does.

How does intensification occur when climbing out of a gravity well
(from a more dense Universe, into a less dense Universe)? It would
make more sense to me that the object was more massive, and was still
getting hotter CMBR light to pump photoactivity, so its intensity
would have nothing to do with gravitational lensing.

David A. Smith

It is gravitationally lensed by a giant elliptical galaxy in a dense cluster
between us and the distant galaxy, which is why it looks a lot brighter than
it would if there were no lensing. In fact it would be invisible to HST.
The cluster and giant galaxy are both much closer to us than the very
distant object.

--
Mike Dworetsky

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