The Mass Profile of Abell 1689 from a Lensing Analysis of Deep Wide Field Subaru Images

Details The Mass Profile of Abell 1689 from a Lensing Analysis of Deep Wide Field Subaru Images The Mass Profile of Abell 1689 from a Lensing Analysis of Deep Wide Field Subaru Images

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jkas...38..191u&link_type=abstract

Journal of the Korean Astronomical Society, vol. 38, no. 2, pp. 191-195

Astronomy and Astrophysics

Astronomy

4

Cosmology: Observations, Gravitational Lensing, Galaxy Clusters: Individual (Abell 1689)

Scientific paper

We used Subaru observations of A1689 (z=0.183) 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± 0.20)× 1015M_&sun;, and surprisingly high concentration, cvir=13.7+1.4-1.1, significantly larger than theoretically expected (cvir≃ 4), corresponding to a relatively steep overall profile. 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.

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