Combined strong and weak lensing analysis of 28 clusters from the Sloan Giant Arcs Survey

By M. Oguri, M. Bayliss, H. Dahle, K. Sharon, M. Gladders, P. Natarajan, J. Hennawi, Benjamin P. Koester. 2011

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We study the mass distribution of a sample of 28 galaxy clusters using strong and weak lensing observations. The clusters are selected via their strong lensing properties as part of the Sloan Giant Arcs Survey (SGAS) from the Sloan Digital Sky Survey (SDSS). Mass modelling of the strong lensing information from the giant arcs is combined with weak lensing measurements from deep Subaru/Suprime-cam images to primarily obtain robust constraints on the concentration parameter and the shape of the mass distribution. We find that the concentration cvir is a steep function of the mass, cvir∝M−0.59±0.12vir, with the value roughly consistent with the lensing-bias-corrected theoretical expectation for high-mass (∼1015 h−1 M⊙) clusters. However, the observationally inferred concentration parameters appear to be much higher at lower masses (∼1014 h−1 M⊙), possibly a consequence of the modification to the inner density profiles provided by baryon cooling. The steep mass–concentration relation is also supported from direct stacking analysis of the tangential shear profiles. In addition, we explore the 2D shape of the projected mass distribution by stacking weak lensing shear maps of individual clusters with prior information on the position angle from strong lens modelling, and find significant evidence for a large mean ellipticity with the best-fitting value of 〈e〉= 0.47 ± 0.06 for the mass distribution of the stacked sample. We find that the luminous cluster member galaxy distribution traces the overall mass distribution very well, although the distribution of fainter cluster galaxies appears to be more extended than the total mass.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/3cce73296c741de08196d91853c94079e8a0ce4f

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Citations in the corpus

HUBBLE SPACE TELESCOPE COMBINED STRONG AND WEAK LENSING ANALYSIS OF THE CLASH SAMPLE: MASS AND MAGNIFICATION MODELS AND SYSTEMATIC UNCERTAINTIES (2014, background): “Various studies have previously combined SL+WL (e.g., Bradač et al. 2006; Limousin et al. 2007; Merten et al. 2009, 2011; Umetsu et al. 2011a, 2011b, 2012; Oguri et al. 2012; Newman et al. 2013a, 2013b).”
A UNIVERSAL MODEL FOR HALO CONCENTRATIONS (2014, result): “M relation than expected (e.g., Oguri et al. 2012; Wiesner et al. 2012).”
Formation of Galaxy Clusters (2012, result): “…2009; Sand et al. 2008, 2004; Tyson, Kochanski & dell’Antonio 1998), whereas concentrations are considerably higher than both theoretical predictions and most other observational determinations from X-ray and WL analyses (Comerford & Natarajan 2007, Oguri et al. 2012, 2009, Zitrin et al. 2011).”
CLASH: THE ENHANCED LENSING EFFICIENCY OF THE HIGHLY ELONGATED MERGING CLUSTER MACS J0416.1−2403 (2012, methodology): “The PIEMD representation is used in many modeling methods (e.g. Halkola et al. 2006; Jullo et al. 2007; Richard et al. 2010; Oguri et al. 2012b), and eases the comparison to the second method we implement here.”
Masses of Galaxy Clusters from Gravitational Lensing (2013, background): “Recently, Oguri et al. (2012) published a new measurement of the halo ellipticity, based on a combined strong/weak lensing study of 28 galaxy clusters selected from the Sloan Giant Arcs Survey.”
CLASH: JOINT ANALYSIS OF STRONG-LENSING, WEAK-LENSING SHEAR, AND MAGNIFICATION DATA FOR 20 GALAXY CLUSTERS (2015, methodology): “The shear analysis pipeline of Umetsu et al. (2014) was implemented based on the procedures described in Umetsu et al. (2010) and on verification tests with mock ground-based observations (Massey et al. 2007; Oguri et al. 2012).”
CLASH: WEAK-LENSING SHEAR-AND-MAGNIFICATION ANALYSIS OF 20 GALAXY CLUSTERS (2014, methodology): “Such projection effects due to cluster asphericity could explain the high apparent concentration and high central surface mass density of these four strong-lensing clusters (see also Oguri et al. 2012).”
CLASH-VLT: The mass, velocity-anisotropy, and pseudo-phase-space density profiles of the z = 0.44 galaxy cluster MACS J1206.2-0847 (2013, background): “…(e.g. Łokas et al. 2006b; Rines & Diaferio 2006; Buote et al. 2007; Schmidt & Allen 2007; Biviano 2008; Ettori et al. 2010; Okabe et al. 2010; Oguri et al. 2012; Newman et al. 2012) and that obtained inΛCDM cosmological simulations (e.g. Navarro et al. 1997; Bullock et al. 2001; Duffy et…”
The Frontier Fields lens modelling comparison project (2016, methodology): “Examples of detailed cluster mass modeling with GLAFIC are found in Oguri (2010), Oguri et al. (2012), Oguri et al. (2013), and Ishigaki et al. (2015); Kawamata et al. (2016).”