Weak Lensing by Galaxy Groups at Intermediate Redshifts

Details Weak Lensing by Galaxy Groups at Intermediate Redshifts Weak Lensing by Galaxy Groups at Intermediate Redshifts

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.8204p&link_type=abstract

American Astronomical Society Meeting 205, #82.04; Bulletin of the American Astronomical Society, Vol. 36, p.1479

Mathematics

Logic

Scientific paper

I will present the results from our weak lensing survey of CNOC2 galaxy groups. The detected shear is used to calculate the M/L of these groups and constrain the matter density of the universe. Galaxy groups are excellent cosmological probes because they dominate the mass and luminosity densities of the Universe, and thus their properties reflect closely the global properties of the universe.
The mass-to-light ratio of the groups was calculated as a function of radius, and found to have an average value of 206 ±27 M&sun;/LR&sun;. The mass-to-light ratio appeared to rise in the outer regions of the galaxy groups, beyond the virial radius where dynamical estimates are valid. The signal-to-noise of the shear measurement was sufficient to allow us to split the sample into two halves: the ``rich'' galaxy groups and the ``poor'' galaxy groups. The rich galaxy groups were found to have an average velocity dispersion of 260 ±39 km/s while the small galaxies were found to have a velocity dispersion of 176 ±37 km/s. The mass-to-light ratio of the rich groups was nearly twice that of the poor groups. This indicates that the rising mass-to-light ratio of the full sample of galaxy groups is an artifact of averaging together many groups with different inherent mass-to-light ratios.

Affiliated with

Also associated with

No associations

Rating

Weak Lensing by Galaxy Groups at Intermediate Redshifts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Weak Lensing by Galaxy Groups at Intermediate Redshifts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Weak Lensing by Galaxy Groups at Intermediate Redshifts will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1641437