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

Journal Article · Mon Sep 25 00:00:00 EDT 2017 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stx2430· OSTI ID:1409251

Prat, J. ; Sánchez, C.; Miquel, R.; Kwan, J.; Blazek, J.; Bonnett, C.; Amara, A.; Bridle, S. L.; Clampitt, J.; Crocce, M.; Fosalba, P.; Gaztanaga, E.; Giannantonio, T.; Hartley, W. G.; Jarvis, M.; MacCrann, N.; Percival, W. J.; Ross, A. J. ; Sheldon, E.; Zuntz, J. ; Abbott, T. M. C.; Abdalla, F. B.; Annis, J.; Benoit-Lévy, A.; Bertin, E.; Brooks, D.; Burke, D. L.; Carnero Rosell, A.; Carrasco Kind, M.; Carretero, J.; Castander, F. J.; da Costa, L. N.; DePoy, D. L.; Desai, S.; Diehl, H. T.; Doel, P.; Eifler, T. F.; Evrard, A. E.; Fausti Neto, A.; Flaugher, B.; Frieman, J.; Gerdes, D. W.; Goldstein, D. A.; Gruen, D.; Gruendl, R. A.; Gutierrez, G.; Honscheid, K.; James, D. J.; Kuehn, K.; Kuropatkin, N.; Lahav, O.; Lima, M.; Marshall, J. L.; Melchior, P.; Menanteau, F.; Nord, B.; Plazas, A. A.; Reil, K.; Romer, A. K.; Roodman, A.; Sanchez, E.; Scarpine, V.; Schubnell, M.; Sevilla-Noarbe, I.; Smith, R. C.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Thomas, D.; Walker, A. R.

We present a measurement of galaxy-galaxy lensing around a magnitude-limited ($$i_{AB} < 22.5$$) 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 Mpc/$$h$$ 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 (Crocce et al. 2016) and CMB lensing (Giannantonio et al. 2016) for the same sample of galaxies, and find our measurements to be in good agreement with those in Crocce et al. (2016), while, in the lowest redshift bin ($$z\sim0.3$$), they show some tension with the findings in Giannantonio et al. (2016). We measure $$b\cdot r$$ to be $$0.87\pm 0.11$$, $$1.12 \pm 0.16$$ and $$1.24\pm 0.23$$, respectively for the three redshift bins of width $$\Delta z = 0.2$$ in the range $0.2<0.8$$, defined with the photometric-redshift algorithm BPZ. Using a different code to split the lens sample, TPZ, leads to changes in the measured biases at the 10-20\% level, but it does not alter the main conclusion of this work: when comparing with Crocce et al. (2016) we do not find strong evidence for a cross-correlation parameter significantly below one in this galaxy sample, except possibly at the lowest redshift bin ($$z\sim 0.3$), where we find $$r = 0.71 \pm 0.11$$ when using TPZ, and $$0.83 \pm 0.12$$ with BPZ.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: The DES Collaboration; DES
• Grant/Contract Number: AC05-00OR22725; AC02-07CH11359
• OSTI ID: 1409251
• Alternate ID(s): OSTI ID: 1362055
• Report Number(s): FERMILAB-PUB-16-389-AE; arXiv:1609.08167; 105601; TRN: US1703191
• Journal Information: Monthly Notices of the Royal Astronomical Society, Vol. 473, Issue 2; ISSN 0035-8711
• Publisher: Royal Astronomical Society
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
gravitational lensing: weak
cosmology: observations
large-scale structure of Universe