Varga, TN;
Gruen, D;
Seitz, S;
MacCrann, N;
Sheldon, E;
Hartley, WG;
Amon, A;
... Weller, J; + view all
(2022)
Synthetic galaxy clusters and observations based on Dark Energy Survey Year 3 Data.
Monthly Notices of the Royal Astronomical Society
, 509
(4)
pp. 4865-4885.
10.1093/mnras/stab3269.
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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 $\lambda \in [30; 45)$, $\lambda \in [45; 60)$ and three bins in cluster redshift ($z\in [0.3; 0.35)$, $z\in [0.45; 0.5)$ and $z\in [0.6; 0.65)$. 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.
| Type: | Article |
|---|---|
| Title: | Synthetic galaxy clusters and observations based on Dark Energy Survey Year 3 Data |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stab3269 |
| Publisher version: | https://doi.org/10.1093/mnras/stab3269 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, gravitational lensing: weak, galaxies: clusters: general, cosmology: observations, INTRACLUSTER LIGHT, WEAK, CONSTRAINTS, COSMOLOGY, CALIBRATION, PARAMETERS, EVOLUTION, SDSS |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10149176 |
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