Structure and History of Dark Matter Halos Probed with Gravitational Lensing

Details Structure and History of Dark Matter Halos Probed with Gravitational Lensing Structure and History of Dark Matter Halos Probed with Gravitational Lensing

2009-03-09

arxiv.org/abs/0903.1589v1

Astrophys. J. 695 (2009) L125

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 3 figures, uses RevTeX4 + emulateapj.cls and apjfonts.sty. Accepted by ApJL

Scientific paper

10.1088/0004-637X/695/2/L125

We test with gravitational lensing data the dark matter (DM) halos embedding the luminous baryonic component of galaxy clusters; our benchmark is provided by their two-stage cosmogonical development that we compute with its variance, and by the related '\alpha-profiles' we derive. The latter solve the Jeans equation for the self-gravitating, anisotropic DM equilibria, and yield the radial runs of the density \rho(r) and the velocity dispersion \sigma_r^2(r) in terms of the DM 'entropy' K = \sigma_r^2/\rho^(2/3) ~ r^(\alpha) highlighted by recent N-body simulations; the former constrains the slope to the narrow range \alpha ~ 1.25 - 1.3. These physically based \alpha-profiles meet the overall requirements from gravitational lensing observations, being intrinsically flatter at the center and steeper in the outskirts relative to the empirical NFW formula. Specifically, we project them along the l.o.s. and compare with a recent extensive dataset from strong and weak lensing observations in and around the cluster A1689. We find an optimal fit at both small and large scales in terms of a halo constituted by an early body with \alpha ~ 1.25 and by recent extensive outskirts, that make up an overall mass 10^15 M_sun with a concentration parameter c ~ 10 consistent with the variance we compute in the \LambdaCDM cosmogony. The resulting structure corresponds to a potential well shallow in the outskirts as that inferred from the X rays radiated from the hot electrons and baryons constituting the intracluster plasma.

Affiliated with

Also associated with

No associations

Rating

Structure and History of Dark Matter Halos Probed with Gravitational Lensing 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 Structure and History of Dark Matter Halos Probed with Gravitational Lensing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Structure and History of Dark Matter Halos Probed with Gravitational Lensing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-96049