Abstract
We develop a new method, which is based on the optimal redshift weighting scheme, to extract the maximal tomographic information of baryonic acoustic oscillations (BAO) and redshift space distortions (RSD) from the extended Baryon Oscillation Spectroscopic Survey (eBOSS) Data Release 14 quasar (DR14Q) survey. We validate our method using the Extended Zel'dovich mocks, and apply our pipeline to the eBOSS DR14Q sample in the redshift range of 0.8 < z < 2.2. We report a joint measurement of f sigma(8) and two-dimensional BAO parameters D-A and H at four effective redshifts of z(eff) = 0.98, 1.23, 1.52, and 1.94, and provide the full data covariance matrix. Using our measurement combined with BOSS DR12, Main Galaxy Sample (MGS), and 6 degree Field Galaxy Survey (6dFGS) BAO measurements, we find that the existence of dark energy is supported by observations at a 7.4 sigma significance level. Combining our measurement with BOSS DR12 and Planck observations, we constrain the gravitational growth index to be gamma = 0.580 +/- 0.082, which is fully consistent with the prediction of general relativity. This paper is part of a set that analyses the eBOSS DR14 quasar sample.
| Item Type: | Journal article |
|---|---|
| Faculties: | Physics |
| Subjects: | 500 Science > 530 Physics |
| ISSN: | 0035-8711 |
| Language: | English |
| Item ID: | 83043 |
| Date Deposited: | 15. Dec 2021, 15:05 |
| Last Modified: | 15. Dec 2021, 15:05 |
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