The Surprisingly Steep Mass Profile of Abell 1689, from a Lensing Analysis of Subaru Images

Details The Surprisingly Steep Mass Profile of Abell 1689, from a Lensing Analysis of Subaru Images The Surprisingly Steep Mass Profile of Abell 1689, from a Lensing Analysis of Subaru Images

2004-12-08

arxiv.org/abs/astro-ph/0412192v1

Astrophys.J.619:L143,2005

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, to appear in ApJL

Scientific paper

10.1086/428122

Subaru observations of A1689 (z=0.183) are used to derive an accurate, model-independent mass profile for the entire cluster, r<2 Mpc/h, by combining magnification bias and distortion measurements. The projected mass profile steepens quickly with increasing radius, falling away to zero at r~1.0 Mpc/h, well short of the anticipated virial radius. Our profile accurately matches onto the inner profile, r<200 kpc/h, derived from deep HST/ACS images. The combined ACS and Subaru information is well fitted by an NFW profile with virial mass, (1.93 \pm 0.20)10^15 M_sun, and surprisingly high concentration, c_vir=13.7^{+1.4}_{-1.1}, significantly larger than theoretically expected (c_vir~4), corresponding to a relatively steep overall profile. A slightly better fit is achieved with a steep power-law model that has its 2D logarithmic slope -3 and core radius theta_c~1.7' (r_c~210 kpc/h), whereas an isothermal profile is strongly rejected. These results are based on a reliable sample of background galaxies selected to be redder than the cluster E/S0 sequence. By including the faint blue galaxy population a much smaller distortion signal is found, demonstrating that blue cluster members significantly dilute the true signal for r~400 kpc/h. This contamination is likely to affect most weak lensing results to date.

Affiliated with

Also associated with

No associations

Rating

The Surprisingly Steep Mass Profile of Abell 1689, from a Lensing Analysis of Subaru Images 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 Surprisingly Steep Mass Profile of Abell 1689, from a Lensing Analysis of Subaru Images, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Surprisingly Steep Mass Profile of Abell 1689, from a Lensing Analysis of Subaru Images will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-151556