Astrophys. J., 619, L143-L146 (2005/February-1)
The surprisingly steep mass profile of A1689, from a lensing analysis of Subaru images.
BROADHURST T., TAKADA M., UMETSU K., KONG X., ARIMOTO N., CHIBA M. and FUTAMASE T.
Abstract (from CDS):
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–1, 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–1, well short of the anticipated virial radius. Our profile accurately matches the inner profile, r≲200 kpc h–1, derived from deep Hubble Space Telescope Advanced Camera for Surveys (ACS) images. The combined ACS and Subaru information is well fitted by a Navarro-Frenk-White profile with virial mass, (1.93±0.20)x1015 M☉, 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. A slightly better fit is achieved with a steep power-law model, dlogΣ(θ)/dlogθ≃-3, with a core θc≃1'.7 (rc≃210 kpc h–1), 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–1. This contamination is likely to affect most weak lensing results to date.
Cosmology: Observations - Galaxies: Clusters: Individual: Alphanumeric: A1689 - Cosmology: Gravitational Lensing
Status at CDS:
Parag. 6 : Cl 0024 = ClG 0024+1654
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