SPT-SZ MCMF: an extension of the SPT-SZ catalogue over the DES region uri icon

abstract

  • ABSTRACT We present an extension to a SunyaevZeldovich Effect (SZE) selected cluster catalogue based on observations from the South Pole Telescope (SPT); this catalogue extends to lower signal to noise than the previous SPTSZ catalogue and therefore includes lower mass clusters. Optically derived redshifts, centres, richnesses, and morphological parameters together with catalogue contamination and completeness statistics are extracted using the multicomponent matched filter (MCMF) algorithm applied to the S/N < 4 SPTSZ candidate list and the Dark Energy Survey (DES) photometric galaxy catalogue. The main catalogue contains 811 sources above S/N=4, has 91 percent purity, and is 95percent complete with respect to the original SZE selection. It contains in total 50percent more clusters and twice as many clusters above z= 0.8 in comparison to the original SPT-SZ sample. The MCMF algorithm allows us to define subsamples of the desired purity with traceable impact on catalogue completeness. As an example, we provide two subsamples with S/N < 4.25 and S/N < 4.5 for which the sample contamination and cleaning-induced incompleteness are both as low as the expected Poisson noise for samples of their size. The subsample with S/N < 4.5 has 98 percent purity and 96percent completeness and is part of our new combined SPT cluster and DES weak-lensing cosmological analysis. We measure the number of false detections in the SPT-SZ candidate list as function of S/N, finding that it follows that expected from assuming Gaussian noise, but with a lower amplitude compared to previous estimates from simulations.

published proceedings

  • Monthly Notices of the Royal Astronomical Society

author list (cited authors)

  • Klein, M., Mohr, J. J., Bocquet, S., Aguena, M., Allen, S. W., Alves, O., ... Young, M.

complete list of authors

  • Klein, M||Mohr, JJ||Bocquet, S||Aguena, M||Allen, SW||Alves, O||Ansarinejad, B||Ashby, MLN||Bacon, D||Bayliss, M||Benson, BA||Bleem, LE||Brodwin, M||Brooks, D||Bulbul, E||Burke, DL||Canning, REA||Carlstrom, JE||Rosell, A Carnero||Carretero, J||Chang, CL||Conselice, C||Costanzi, M||Crites, AT||da Costa, LN||Pereira, MES||Davis, TM||De Vicente, J||Desai, S||de Haan, T||Dobbs, MA||Doel, P||Ferrero, I||Flores, AM||Frieman, J||George, EM||Giannini, G||Gladders, MD||Gonzalez, AH||Grandis, S||Gruen, D||Gruendl, RA||Gutierrez, G||Halverson, NW||Hinton, SR||Holder, GP||Hollowood, DL||Holzapfel, WL||Honscheid, K||Hrubes, JD||Huang, N||James, DJ||Khullar, G||Kim, K||Knox, L||Kraft, R||Kéruzoré, F||Lee, AT||Luong-Van, D||Mahler, G||Mantz, A||Marrone, DP||Marshall, JL||McDonald, M||McMahon, JJ||Mena-Fernández, J||Menanteau, F||Meyer, SS||Miquel, R||Myles, J||Padin, S||Pieres, A||Plazas Malagón, AA||Pryke, C||Reichardt, CL||Reil, K||Roberson, J||Romer, AK||Romero, C||Ruhl, JE||Saliwanchik, BR||Salvati, L||Sanchez, E||Saro, A||Schaffer, KK||Schrabback, T||Schubnell, M||Sevilla-Noarbe, I||Sharon, K||Shirokoff, E||Smith, M||Somboonpanyakul, T||Stalder, B||Stanford, SA||Stark, AA||Strazzullo, V||Suchyta, E||Swanson, MEC||Tarle, G||To, C||Vanderlinde, K||Vieira, JD||von der Linden, A||Weaverdyck, N||Williamson, R||Wiseman, P||Young, M

publication date

  • June 2024