• DOI:10.1093/mnras/stx2430
• Corpus ID: 119202175

Galaxy bias from galaxy-galaxy lensing in the DES science verification data

@article{Prat2016GalaxyBF,
  title={Galaxy bias from galaxy-galaxy lensing in the DES science verification data},
  author={Judit Prat and Carles S'anchez and Ramon Miquel and Juliana Kwan and Jonathan A. Blazek and Christopher Bonnett and Adam Amara and Sarah Bridle and Joseph Clampitt and Mart{\'i}n Crocce and Pablo Fosalba and Enrique Gazta{\~n}aga and T. Giannantonio and William G. Hartley and Michael Jarvis and Niall MacCrann and Will J Percival and Ashley J. Ross and Erin S. Sheldon and Joe Zuntz and Timothy M. C. Abbott and Filipe B. Abdalla and James T. Annis and Aur{\'e}lien Benoit-L{\'e}vy and Emmanuel Bertin and David Brooks and David L. Burke and Aurelio Carnero Rosell and Matias Carrasco Kind and Jorge Carretero and Francisco Javier Castander and Luiz Nicolaci da Costa and Darren Lee Depoy and Shantanu Desai and H. Thomas Diehl and Peter Doel and T. F. Eifler and August E. Evrard and Angelo Fausti Neto and Brenna L. Flaugher and Joshua A. Frieman and David W. Gerdes and Daniel Gruen and Robert A. Gruendl and Gaston R. Guti{\'e}rrez and Klaus Honscheid and David J. James and Kyler W. Kuehn and Nikolay Kuropatkin and Ofer Lahav and Marcos Lima and Jennifer L. Marshall and Peter Melchior and Felipe Menanteau and Brian Nord and Andreas Alejandro Plazas and Kevin Alexander Reil and A. K. Romer and Aaron Roodman and Eusebio S{\'a}nchez and Victor E. Scarpine and Michael S. Schubnell and Ignacio Sevilla-Noarbe and R. C. Smith and Marcelle Soares-Santos and Flavia Sobreira and Eric Suchyta and Mollye E. C. Swanson and Gregory G. Tarl{\'e} and D. Thomas and Alistair R. Walker},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2016},
  volume={473},
  pages={1667-1684}
}

• J. Prat, C. S'anchez, +68 authors A. Walker
• Published 26 September 2016
• Physics
• Monthly Notices of the Royal Astronomical Society

We present a measurement of galaxy–galaxy lensing around a magnitude-limited (iAB < 22.5) sample of galaxies from the dark energy survey science verification (DES-SV) data. We split these lenses into three photometric-redshift bins from 0.2 to 0.8, and determine the product of the galaxy bias b and cross-correlation coefficient between the galaxy and dark matter overdensity fields r in each bin, using scales above 4 h−1 Mpc comoving, where we find the linear bias model to be valid given our current uncertainties. We compare our galaxy bias results from galaxy–galaxy lensing with those obtained from galaxy clustering and CMB lensing for the same sample of galaxies, and find our measurements to be in good agreement with those in Crocce et al., while, in the lowest redshift bin (z ∼ 0.3), they show some tension with the findings in Giannantonio et al. We measure b· r to be 0.87 ± 0.11, 1.12 ± 0.16 and 1.24 ± 0.23, respectively, for the three redshift bins of width Δz = 0.2 in the range 0.2 < z < 0.8, defined with the photometric-redshift algorithm BPZ. Using a different code to split the lens sample, TPZ, leads to changes in the measured biases at the 10–20 per cent level, but it does not alter the main conclusion of this work: when comparing with Crocce et al. we do not find strong evidence for a cross-correlation parameter significantly below one in this galaxy sample, except possibly at the lowest redshift bin (z ∼ 0.3), where we find r = 0.71 ± 0.11 when using TPZ, and 0.83 ± 0.12 with BPZ.