The Synergy between the Dark Energy Survey and the South Pole Telescope
Abstract
The Dark Energy Survey (DES) has recently completed its science verification (SV) phase, collecting data over 150 deg2 of sky. In this work we analyze to what extent it is beneficial to supplement the analysis of DES data with cosmic microwave background (CMB) lensing data. We provide forecasts for both DES-SV and for the full survey covering 5000 deg2. We show that data presently available from DES-SV and SPT-SZ would allow a ~8% measurement of the linear galaxy bias in three out of four redshift bins. We further show that a joint analysis of cosmic shear, galaxy density, and CMB lensing data allows to break the degeneracy between the shear multiplicative bias, the linear galaxy bias, and the normalization of the matter power spectrum. We show that these observables can thus be self-calibrated to the percent or sub-percent level, depending on the quality of available data and the fraction of overlap of the footprints and priors included in the analysis.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 2013
- DOI:
- 10.1088/0004-637X/778/2/108
- arXiv:
- arXiv:1304.3474
- Bibcode:
- 2013ApJ...778..108V
- Keywords:
-
- cosmological parameters;
- dark energy;
- large-scale structure of universe;
- Astrophysics - Cosmology and Extragalactic Astrophysics
- E-Print:
- 5 pages, 2 figures. Accepted in Astrophysical Journal. Matches published version