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The Surprisingly Steep Mass Profile of Abell 1689, from a Lensing Analysis of Subaru Images | Tom Broadhurst
; Masahiro Takada
; Keiichi Umetsu
; Xu Kong
; Nobuo Arimoto
; Masashi Chiba
; Toshifumi Futamase
; | Date: |
8 Dec 2004 | Journal: | Astrophys.J. 619 (2005) L143 | Subject: | astro-ph | Affiliation: | Tel Aviv Univ., Tohoku Univ., ASIAA, NAOJ | Abstract: | 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. | Source: | arXiv, astro-ph/0412192 | Services: | Forum | Review | PDF | Favorites |
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