The Surprisingly Steep Mass Profile of A1689, from a Lensing Analysis of Subaru Images

By T. Broadhurst, Masahiro Takada, Keiichi Umetsu, Xu Kong, N. Arimoto, Masashi Chiba, Toshifumi Futamase Tohoku Univ., T. Univ., Asiaa, Naoj. 2004

204 citations recorded by the source corpus.

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) × 1015 M☉, and surprisingly high concentration, cvir = 13.7, 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, d log Σ(θ)/d log θ ≃ -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.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/bdd64d533586908f47f9e38233c039a0fb44feb3

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Citations in the corpus

Combined strong and weak lensing analysis of 28 clusters from the Sloan Giant Arcs Survey (2011, background): “…strong and weak lensing, have indicated that the mass distribution is surprisingly highly concentrated with an estimated concentration parameter of cvir ∼ 12, which is significantly higher than the expected standard ΛCDM prediction of cvir ∼ 4 (Broadhurst et al. 2005; Umetsu & Broadhurst 2008).”
Combining Strong and Weak Gravitational Lensing in Abell 1689 (2006, methodology): “Broadhurst et al. (2005a) found a higher concentration, cvir 13 (corresponding to c200 ¼ 10:8),when fitting simultaneously both strong- andweaklensing data points.”
MEASURING THE ULTIMATE HALO MASS OF GALAXY CLUSTERS: REDSHIFTS AND MASS PROFILES FROM THE HECTOSPEC CLUSTER SURVEY (HeCS) (2012, background): “This cluster is a famous strong-lensing cluster (e.g., Broadhurst et al. 2005).”
LoCuSS: Subaru Weak Lensing Study of 30 Galaxy Clusters (2009, background): “…none of our morphologically unbiased X-ray selected sample of clusters, including those with the highest masses (& 1015 Mˇ), show very high concentrations of cvir & 10 as have been found for some strong lensing clusters (e.g., Gavazzi et al. 2003; Kneib et al. 2003; Broadhurst et al. 2005, 2008).”
LoCuSS: comparison of observed X-ray and lensing galaxy cluster scaling relations with simulations (2008, methodology): “…10 clusters from CFH12k data (Bardeau et al. 2005, 2007); 15 clusters from observations at the Nordic Optical Telescope and UH 88in (Dahle 2006); one cluster, Abell 1689, has also been studied using both CFHT and Subaru data (Limousin et al. 2007; Halkola et al. 2006; Broadhurst et al. 2005).”
The observed concentration–mass relation for galaxy clusters (2007, unknown): “+1 −1 Broadhurst et al. (2005) WL 30.4 37.4 Halkola et al. (2006) WL 22.1+2.9−4.7 27.2 +3.5 −5.7 Medezinski et al. (2006) WL 3.5+0.5−0.3 14.1 +6.3 −4.7 4.5 +0.6 −0.4 17.1 +7.8 −5.8 Bardeau et al. (2005) WL 11.0+1.14−0.90 17.3 ± 1.7 13.7+1.4−1.1 19.3 ± 2.0 Broadhurst et al. (2005) WL 7.9 9.9 Clowe…”
The Sloan Lens ACS Survey. IV. The Mass Density Profile of Early-Type Galaxies out to 100 Effective Radii (2007, methodology): “We measured the shear signal for galaxies redder than the lenses (i.e. F555W − F814W ≥ 1.5), expected to be at higher redshift (see e.g. Broadhurst et al. 2005; Limousin et al. 2006, for similar color selections).”
CLASH: WEAK-LENSING SHEAR-AND-MAGNIFICATION ANALYSIS OF 20 GALAXY CLUSTERS (2014, background): “In particular, this lensing dilution effect due to contamination by cluster members can lead to a substantial underestimation of the true signal for R <∼ 400 kpch−1 by a factor of 2–5, as demonstrated in Broadhurst et al. (2005) and Medezinski et al. (2010).”
Combining Lens Distortion and Depletion to Map the Mass Distribution of A1689 (2007, background): “This is based on the fact that the enclosed mass interior to the Einstein radius is given by fundamental constants and with knowledge of distances involved, namely κ̄(θE) = 1 or M(< θE) = π(DdθE) 2Σcrit, provided that the critical curve is nearly circular; this is the case for A1689 (B05b).”
CLASH: JOINT ANALYSIS OF STRONG-LENSING, WEAK-LENSING SHEAR, AND MAGNIFICATION DATA FOR 20 GALAXY CLUSTERS (2015, background): “…because few fainter galaxies can be magnified up into the flux-limited sample; this results in a net depletion of source counts (Taylor et al. 1998; Broadhurst et al. 2005; Umetsu & Broadhurst 2008; Umetsu et al. 2010, 2011b, 2012, 2014, 2015; Ford et al. 2012; Coe et al. 2012; Medezinski et al.…”
New Multiply-Lensed Galaxies Identified in ACS/NIC3 Observations of Cl0024+1654, Using an Improved Mass Model (2009, methodology): “This approach is similar to that of Broadhurst et al. (2005a), which was successfully used to identify over 30 sets of multiple images in similarly deep ACS/GTO imaging of A1689, and also for the more distant cluster SDSS1004+4112 which was discovered to have 4 bright lensed QSO images (Oguri et…”
Characterizing the Cluster Lens Population (2005, background): “The anomalously high concentrations c > 14 recently reported by several groups (Kneib et al. 2003; Gavazzi et al. 2003; Broadhurst et al. 2005b) appear inconsistent with the concentration distribution in our simulations, which predict that < 2% of lensing clusters should have concentrations this…”
Subaru Weak Lensing Study of Seven Merging Clusters: Distributions of Mass and Baryons (2007, methodology): “For all of the cluster targets, we assume the mean redshift of the red background galaxies is 〈zs〉 = 1 (e.g., Broadhurst et al. 2005).”
CIRS: Cluster Infall Regions in the Sloan Digital Sky Survey. I. Infall Patterns and Mass Profiles (2006, background): “Similarly, recent mass profiles from weak lensing similarly find evidence of high concentrations in A1689 (Broadhurst et al. 2005a,b), CL0024 (Kneib et al. 2003), and MS2137 (Gavazzi 2005).”