Synthetic galaxy clusters and observations based on Dark Energy Survey Year 3 Data

Varga, T. N.; Gruen, D.; Seitz, S.; MacCrann, N.; Sheldon, E.; Hartley, W. G.; Amon, A.; Choi, A.; Palmese, A.; Zhang, Y.; Becker, M. R.; McCullough, J.; Rozo, E.; Rykoff, E. S.; To, C.; Grandis, S.; Bernstein, G. M.; Dodelson, S.; Eckert, K.; Everett, S.; Gruendl, R. A.; Harrison, I.; Herner, K.; Rollins, R. P.; Sevilla-Noarbe, I.; Troxel, M. A.; Yanny, B.; Zuntz, J.; Diehl, H. T.; Jarvis, M.; Aguena, M.; Allam, S.; Annis, J.; Bertin, E.; Bhargava, S.; Brooks, D.; Carnero Rosell, A.; Kind, M. Carrasco; Carretero, J.; Costanzi, M.; da Costa, L. N.; Pereira, M. E. S.; De Vicente, J.; Desai, S.; Dietrich, J. P.; Ferrero, I.; Flaugher, B.; Garcia-Bellido, J.; Gaztanaga, E.; Gerdes, D. W.; Gschwend, J.; Gutierrez, G.; Hinton, S. R.; Honscheid, K.; Jeltema, T.; Kuehn, K.; Kuropatkin, N.; Maia, M. A. G.; March, M.; Melchior, P.; Menanteau, F.; Miquel, R.; Morgan, R.; Myles, J.; Paz-Chinchon, F.; Plazas, A. A.; Romer, A. K.; Sanchez, E.; Scarpine, V.; Schubnell, M.; Serrano, S.; Smith, M.; Soares-Santos, M.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Thomas, D. und Weller, Jochen (2022): Synthetic galaxy clusters and observations based on Dark Energy Survey Year 3 Data. In: Monthly Notices of the Royal Astronomical Society, Bd. 509, Nr. 4: S. 4865-4885

Abstract

We develop a novel data-driven method for generating synthetic optical observations of galaxy clusters. In cluster weak lensing, the interplay between analysis choices and systematic effects related to source galaxy selection, shape measurement, and photometric redshift estimation can be best characterized in end-to-end tests going from mock observations to recovered cluster masses. To create such test scenarios, we measure and model the photometric properties of galaxy clusters and their sky environments from the Dark Energy Survey Year 3 (DES Y3) data in two bins of cluster richness lambda is an element of [30;45), lambda is an element of [45;60) and three bins in cluster redshift (z is an element of[0.3;0. 35), z is an element of[0. 45;0.5) and z is an element of [0.6;0. 65). Using deep-field imaging data, we extrapolate galaxy populations beyond the limiting magnitude of DES Y3 and calculate the properties of cluster member galaxies via statistical background subtraction. We construct mock galaxy clusters as random draws from a distribution function, and render mock clusters and line-of-sight catalogues into synthetic images in the same format as actual survey observations. Synthetic galaxy clusters are generated from real observational data, and thus are independent from the assumptions inherent to cosmological simulations. The recipe can be straightforwardly modified to incorporate extra information, and correct for survey incompleteness. New realizations of synthetic clusters can be created at minimal cost, which will allow future analyses to generate the large number of images needed to characterize systematic uncertainties in cluster mass measurements.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik > Astronomie und Astrophysik, Kosmologie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0035-8711
• Sprache: Englisch
• DFG: Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 390783311