Loureiro, A;
Moraes, B;
Abdalla, FB;
Cuceu, A;
McLeod, M;
Whiteway, L;
Balan, ST;
... Xavier, HS; + view all
(2019)
Cosmological measurements from angular power spectra analysis of BOSS DR12 tomography.
Monthly Notices of the Royal Astronomical Society
, 485
(1)
pp. 326-355.
10.1093/mnras/stz191.
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Abstract
We constrain cosmological parameters by analysing the angular power spectra of the Baryon Oscillation Spectroscopic Survey DR12 galaxies, a spectroscopic follow-up of around 1.3 million SDSS galaxies over 9376 deg2 with an effective volume of ∼6.5 (Gpc h−1)3 in the redshift range 0.15 ≤ z < 0.80. We split this sample into 13 tomographic bins (Δz = 0.05); angular power spectra were calculated using a Pseudo-Cℓ estimator, and covariance matrices were estimated using lognormal simulated maps. Cosmological constraints obtained from these data were combined with constraints from Planck cosmic microwave background experiment as well as the JLA supernovae compilation. Considering a wCDM cosmological model measured on scales up to kmax = 0.07h Mpc−1, we constrain a constant dark energy equation-of-state with an ∼4 per cent error at the 1σ level: w0=−0.993+0.046−0.043, together with Ωm = 0.330 ± 0.012, Ωb = 0.0505 ± 0.002, S8≡σ8Ωm/0.3−−−−−−√=0.863±0.016, and h = 0.661 ± 0.012. For the same combination of data sets, but now considering a ΛCDM (lambda cold dark matter) model with massive neutrinos and the same scale cut, we find Ωm = 0.328 ± 0.009, Ωb=0.05017+0.0009−0.0008, S8 = 0.862 ± 0.017, and h=0.663+0.006−0.007, and a 95 per cent credible interval (CI) upper limit of ∑mν < 0.14 eV for a normal hierarchy. These results are competitive if not better than standard analyses with the same data set, and demonstrate that this should be a method of choice for future surveys, opening the door for their full exploitation in cross-correlation probes.
| Type: | Article |
|---|---|
| Title: | Cosmological measurements from angular power spectra analysis of BOSS DR12 tomography |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stz191 |
| Publisher version: | https://doi.org/10.1093/mnras/stz191 |
| Language: | English |
| Additional information: | © The Author 2019. Published by Oxford University Press on behalf of The Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creative commons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | neutrinos, dark energy, large-scale structure of Universe, cosmology: observations |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10074966 |
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