On 10/2/12 3:16 PM, Nicolaas Vroom wrote:
On Thursday, September 20, 2012 8:30:10 AM UTC+2, Richard D. Saam wrote:

A more appropriate study may be: Implicit Priors in Galaxy Cluster
Mass and Scaling Relation Determinations
http://arxiv.org/abs/1106.4052
Adam Mantz (NASA/GSFC), Steven W. Allen (KIPAC, Stanford/SLAC)

Table C1 page 11 shows 4 lines with of galaxy cluster data
with almost identical kT values.
De values for z, E(z), M2500 and kT are shown:
16) 0.295 1.163 2.67 8.03
22) 0.352 1.201 4.02 8.05
23) 0.355 1.203 6.02 8.08
37) 0.686 1.462 3.07 8.08

The lines 22 and 23 are almost identical but the M2500
values are rather different.
What is the explanation ?
The explanation is not readily apparent.
Also:
The kT values in the the keV range
represent the inter galactic gas temperature
as related to gravitational energy.
A graphical plot of kT vs z indicates no correlation
Also
A graphical plot of M2500 vs z indicates no correlation
but
A graphical plot of M2500 vs kT indicates the slope 1.9 correlation.
and
A graphical plot of E(z)*M2500 vs kT indicates the slope 1.9 correlation.
What is the explanation ?

We need a better idea of the galactic distribution with time
to be provided in part by
http://www.darkenergysurvey.org/
"an extremely sensitive 570-Megapixel digital camera, DECam,
mounted on the Blanco 4-meter telescope at Cerro Tololo Inter-American
Observatory high in the Chilean Andes"
for detecting redshifted long-wavelength red and infrared light
and coupled with X-ray gamma-ray surveys.