Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-07-01
Astrophys.J. 574 (2002) L129-L134
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures, accepted for publication in Ap.J. Letters
Scientific paper
10.1086/342530
We present new spectroscopic observations of the gravitational arcs and the brightest cluster galaxy (BCG) in the cluster MS2137-23 (z=0.313) obtained with the Echelle Spectrograph and Imager on the Keck II telescope. We find that the tangential and radial arcs arise from sources at almost identical redshifts (z=1.501,1.502). We combine the measured stellar velocity dispersion profile of the BCG with a lensing analysis to constrain the distribution of dark and stellar matter in the central 100 kpc of the cluster. Our data indicate a remarkably flat inner slope for the dark matter profile, rho_d propto r^-beta, with beta<0.9 at 99% CL. Steep inner slopes obtained in cold dark matter cosmological simulations -- such as Navarro Frenk & White (beta=1) or Moore (1.5) universal dark matter profiles -- are ruled out at better than 99% CL. As baryon collapse is likely to have steepened the dark matter profile from its original form, our data provides a powerful test of the cold dark matter paradigm at the cluster mass scale.
Ellis Richard S.
Sand David J.
Treu Tommaso
No associations
LandOfFree
The dark matter density profile of the lensing cluster MS2137-23: a test of the cold dark matter paradigm 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 The dark matter density profile of the lensing cluster MS2137-23: a test of the cold dark matter paradigm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The dark matter density profile of the lensing cluster MS2137-23: a test of the cold dark matter paradigm will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-632016