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Galaxy bias from the Dark Energy Survey Science Verification data: combining galaxy density maps and weak lensing maps

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posted on 2023-06-09, 01:52 authored by C Chang, A Pujol, E Gaztañaga, A Amara, A Réfrégier, D Bacon, M R Becker, C Bonnett, J Carretero, F J Castander, M Crocce, P Fosalba, T Giannantonio, W Hartley, M Jarvis, T Kacprzak, A J Ross, E Sheldon, M A Troxel, V Vikram, J Zuntz, T M C Abbott, F B Abdalla, S Allam, J Annis, A Benoit-Lévy, E Bertin, D Brooks, E Buckley-Geer, D L Burke, D Capozzi, A Carnero Rosell, M Carrasco Kind, C E Cunha, C B D'Andrea, L N da Costa, S Desai, H T Diehl, J P Dietrich, P Doel, T F Eifler, J Estrada, A E Evrard, B Flaugher, J Frieman, D A Goldstein, D Gruen, R A Gruendl, G Gutierrez, K Honscheid, B Jain, D J James, K Kuehn, N Kuropatkin, O Lahav, T S Li, M Lima, J L Marshall, P Martini, P Melchior, C J Miller, R Miquel, J J Mohr, R C Nichol, B Nord, R Ogando, A A Plazas, K Reil, Kathy RomerKathy Romer, A Roodman, E S Rykoff, E Sanchez, V Scarpine, M Schubnell, I Sevilla-Noarbe, R C Smith, M Soares-Santos, F Sobreira, E Suchyta, M E C Swanson, G Tarle, D Thomas, A R Walker
We measure the redshift evolution of galaxy bias for a magnitude-limited galaxy sample by combining the galaxy density maps and weak lensing shear maps for a ˜116 deg2 area of the Dark Energy Survey (DES) Science Verification (SV) data. This method was first developed in Amara et al. and later re-examined in a companion paper with rigorous simulation tests and analytical treatment of tomographic measurements. In this work we apply this method to the DES SV data and measure the galaxy bias for a i < 22.5 galaxy sample. We find the galaxy bias and 1sigma error bars in four photometric redshift bins to be 1.12 ± 0.19 (z = 0.2-0.4), 0.97 ± 0.15 (z = 0.4-0.6), 1.38 ± 0.39 (z = 0.6-0.8), and 1.45 ± 0.56 (z = 0.8-1.0). These measurements are consistent at the 2sigma level with measurements on the same data set using galaxy clustering and cross-correlation of galaxies with cosmic microwave background lensing, with most of the redshift bins consistent within the 1sigma error bars. In addition, our method provides the only sigma8 independent constraint among the three. We forward model the main observational effects using mock galaxy catalogues by including shape noise, photo-z errors, and masking effects. We show that our bias measurement from the data is consistent with that expected from simulations. With the forthcoming full DES data set, we expect this method to provide additional constraints on the galaxy bias measurement from more traditional methods. Furthermore, in the process of our measurement, we build up a 3D mass map that allows further exploration of the dark matter distribution and its relation to galaxy evolution.

Funding

Astrophysics and Cosmology - Sussex Consolidated Grant; G1291; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/L000652/1

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

3

Volume

459

Page range

3203-3216

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-06-23

First Open Access (FOA) Date

2016-06-23

First Compliant Deposit (FCD) Date

2016-06-23

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