New Neutrino Mass Bounds from SDSSIII Data Release 8 Photometric Luminous Galaxies
Abstract
We present neutrino mass bounds using 900,000 luminous galaxies with photometric redshifts measured from Sloan Digital Sky Survey III Data Release 8. The galaxies have photometric redshifts between z = 0.45 and z = 0.65 and cover 10,000 deg^{2}, thus probing a volume of 3 h ^{3} Gpc^{3} and enabling tight constraints to be derived on the amount of dark matter in the form of massive neutrinos. A new bound on the sum of neutrino masses ∑m _{ν} < 0.27 eV, at the 95% confidence level (CL), is obtained after combining our sample of galaxies, which we call "CMASS," with Wilkinson Microwave Anisotropy Probe (WMAP) sevenyear cosmic microwave background data and the most recent measurement of the Hubble parameter from the Hubble Space Telescope (HST). This constraint is obtained with a conservative multipole range of 30 < l < 200 in order to minimize nonlinearities, and a free bias parameter in each of the four redshift bins. We study the impact of assuming this linear galaxy bias model using mock catalogs and find that this model causes a small (~1σ1.5σ) bias in Ω_{DM} h ^{2}. For this reason, we also quote neutrino bounds based on a conservative galaxy bias model containing additional, shotnoiselike free parameters. In this conservative case, the bounds are significantly weakened, e.g., ∑m _{ν} < 0.38 eV (95% CL) for WMAP+HST+CMASS (l_{max} = 200). We also study the dependence of the neutrino bound on the multipole range (l_{max} = 150 versus l_{max} = 200) and on which combination of data sets is included as a prior. The addition of supernova and/or baryon acoustic oscillation data does not significantly improve the neutrino mass bound once the HST prior is included. A companion paper describes the construction of the angular power spectra in detail and derives constraints on a general cosmological model, including the dark energy equation of state w and the spatial curvature Ω_{ K }, while a second companion paper presents a measurement of the scale of baryon acoustic oscillations from the same data set. All three works are based on the catalog by Ross et al.
 Publication:

The Astrophysical Journal
 Pub Date:
 December 2012
 DOI:
 10.1088/0004637X/761/1/12
 arXiv:
 arXiv:1201.1909
 Bibcode:
 2012ApJ...761...12D
 Keywords:

 cosmological parameters;
 cosmology: observations;
 largescale structure of universe;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 14 pages, 8 figures, 1 table