Mass calibration of galaxy clusters at redshift 0.1-1.0 using weak lensing in the Sloan Digital Sky Survey Stripe 82 co-add

作者：Wiesner Matthew P; Lin Huan; Soares Santos Marcelle

来源：Monthly Notices of the Royal Astronomical Society, 2015, 452(1): 701-714.

DOI：10.1093/mnras/stv1332

• gravitational lensing: weak
• surveys
• galaxies: clusters: general

We present galaxy cluster mass-richness relations found in the Sloan Digital Sky Survey Stripe 82 co-add using clusters found using a Voronoi tessellation cluster finder. These relations were found using stacked weak lensing shear observed in a large sample of galaxy clusters. These mass-richness relations are presented for four redshift bins, 0.1 < z <= 0.4, 0.4 < z <= 0.7, 0.7 < z <= 1.0 and 0.1 < z <= 1.0. We describe the sample of galaxy clusters and explain how these clusters were found using a Voronoi tessellation cluster finder. We fit a Navarro-Frenk-White profile to the stacked weak lensing shear signal in redshift and richness bins in order to measure virial mass (M-200). We describe several effects that can bias weak lensing measurements, including photometric redshift bias, the effect of the central BCG, halo miscentering, photometric redshift uncertainty and foreground galaxy contamination. We present mass-richness relations using richness measure N-VT with each of these effects considered separately as well as considered altogether. We also examine redshift evolution of the mass-richness relation. As a result, we present measurements of the mass coefficient (M-200 vertical bar 20) and the power-law slope (alpha) for power-law fits to the mass and richness values in each of the redshift bins. We find values of the mass coefficient of 8.49 +/- 0.526, 14.1 +/- 1.78, 30.2 +/- 8.74 and 9.23 +/- 0.525 x 10(13) h(-1) M-circle dot for each of the four redshift bins, respectively. We find values of the power-law slope of 0.905 +/- 0.0585, 0.948 +/- 0.100, 1.33 +/- 0.260 and 0.883 +/- 0.0500, respectively.

• 出版日期2015-9-1