Originally posted by theDarthvader
Xploder, I know this is one of your areas of expertise, could you how explain how you think this links to your bubbles / lens theory? Is it possible
that this huge halo is impacting on our view of the wider universe? Or is it too diffuse? I was thinking that surely a structure this big could affect
our measurements and calculations of distances and expansion of the universe? What are your thoughts on this? Could the halo distort our viewpoint,
and therefore calculations? What if the halo was expanding or contracting, would that make a difference? Or is it completely irrelevant to our current
theories? particularly regarding the expansion of the universe, redshift etc.
in the following picture is a galaxy cluster with galaxies in it
what is happening (imho) is that diffuse gas "between" the individual galaxies is acting like a lens,
each galaxy is acting like a lens,
and the gravity of the cumulative mass of all the galaxies is attracting and concentrating gas.
if you had an empty glass you could see through it with little distortion,
fill the glass with water,
now light goes through the glass, through the water and an image on the other side would be magnifyed but distorted,
now add a small magnifying glass to the water,
the water effects the power of magnifying glass when looking at the image in the background.
this is all achieved with optical lensing.
the water is the difuse gas surrounding the galaxy in this example.
at larger scales you have to add gravity distortion into the equation.
so as you can see from the example the gas cloud could have an effect of what we image with telescopes,
just like the water in the glass.
please note the refractive index of water is high, (large effect over short distance)
the refractive index of diffuse gas is very low, (small effect if imaging over large distances)
we know there is missing mass from the images and there distortions over large distances,
dark matter was a "place holder" for the amount of distortion because we couldnt see what was distorting the images.
the galaxy "bubble" the "shape" of the galaxy inside of the bubble and its gravitational mass all contribute to warp what we see. if we add diffuse
gas that has a different refractive index material to "all" those equations
it is very possible that this cloud would distort our view of the universe (only outside our galaxy)
if our galaxy was a optical/gravitational lens,
and we are inside it,
everything would be out of scale and distances would be deceiving.
objects would not be were they looked to be
edit on 24-9-2012 by XPLodER because: (no reason given)