Constraints on the richness-mass relation and the optical-SZE positional offset distribution for SZE-selected clusters Academic Article uri icon

abstract

  • 2015 The Author. We cross-match galaxy cluster candidates selected via their Sunyaev-Zel'dovich effect (SZE) signatures in 129.1 deg2 of the South Pole Telescope 2500d SPT-SZ survey with optically identified clusters selected from the Dark Energy Survey science verification data. We identify 25 clusters between 0.1 z 0.8 in the union of the SPT-SZ and redMaPPer (RM) samples. RM is an optical cluster finding algorithm that also returns a richness estimate for each cluster. We model the richness -mass relation with the following function ln|M500 BlnM500 + Cln E(z) and use SPT-SZ cluster masses and RM richnesses to constrain the parameters. We find B = 1.14-0.18+0.21 and C = 0.73-0.75+0.77. The associated scatter in mass at fixed richness is lnM| = 0.18-0.05+0.08 at a characteristic richness =70.We demonstrate that our model provides an adequate description of the matched sample, showing that the fraction of SPT-SZ-selected clusters with RM counterparts is consistent with expectations and that the fraction of RMselected clusters with SPT-SZ counterparts is in mild tension with expectation. We model the optical-SZE cluster positional offset distribution with the sum of two Gaussians, showing that it is consistent with a dominant, centrally peaked population and a subdominant population characterized by larger offsets. We also cross-match the RMcatalogue with SPT-SZ candidates below the official catalogue threshold significance = 4.5, using the RM catalogue to provide optical confirmation and redshifts for 15 additional clusters with [4, 4.5].

published proceedings

  • MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

altmetric score

  • 2.75

author list (cited authors)

  • Saro, A., Bocquet, S., Rozo, E., Benson, B. A., Mohr, J., Rykoff, E. S., ... Ziegler, K. E.

citation count

  • 88

complete list of authors

  • Saro, A||Bocquet, S||Rozo, E||Benson, BA||Mohr, J||Rykoff, ES||Soares-Santos, M||Bleem, L||Dodelson, S||Melchior, P||Sobreira, F||Upadhyay, V||Weller, J||Abbott, T||Abdalla, FB||Allam, S||Armstrong, R||Banerji, M||Bauer, AH||Bayliss, M||Benoit-Levy, A||Bernstein, GM||Bertin, E||Brodwin, M||Brooks, D||Buckley-Geer, E||Burke, DL||Carlstrom, JE||Capasso, R||Capozzi, D||Carnero Rosell, A||Kind, M Carrasco||Chiu, I||Covarrubias, R||Crawford, TM||Crocce, M||D'Andrea, CB||da Costa, LN||DePoy, DL||Desai, S||de Haan, T||Diehl, HT||Dietrich, JP||Doel, P||Cunha, CE||Eifler, TF||Evrard, AE||Fausti Neto, A||Fernandez, E||Flaugher, B||Fosalba, P||Frieman, J||Gangkofner, C||Gaztanaga, E||Gerdes, D||Gruen, D||Gruendl, RA||Gupta, N||Hennig, C||Holzapfel, WL||Honscheid, K||Jain, B||James, D||Kuehn, K||Kuropatkin, N||Lahav, O||Li, TS||Lin, H||Maia, MAG||March, M||Marshall, JL||Martini, Paul||McDonald, M||Miller, CJ||Miquel, R||Nord, B||Ogando, R||Plazas, AA||Reichardt, CL||Romer, AK||Roodman, A||Sako, M||Sanchez, E||Schubnell, M||Sevilla, I||Smith, RC||Stalder, B||Stark, AA||Strazzullo, V||Suchyta, E||Swanson, MEC||Tarle, G||Thaler, J||Thomas, D||Tucker, D||Vikram, V||von der Linden, A||Walker, AR||Wechsler, RH||Wester, W||Zenteno, A||Ziegler, KE

publication date

  • December 2015