Chan, KC;
Avila, S;
Carnero Rosell, A;
Ferrero, I;
Elvin-Poole, J;
Sanchez, E;
Camacho, H;
... Weaverdyck, N; + view all
(2022)
Dark Energy Survey Year 3 results: Measurement of the baryon acoustic oscillations with three-dimensional clustering.
Physical Review D
, 106
(12)
, Article 123502. 10.1103/PhysRevD.106.123502.
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Abstract
The three-dimensional correlation function offers an effective way to summarize the correlation of the large-scale structure even for imaging galaxy surveys. We have applied the projected three-dimensional correlation function, ζp to measure the baryonic acoustic oscillations (BAO) scale on the first-three years Dark Energy Survey data. The sample consists of about 7 million galaxies in the redshift range 0.6<zp<1.1 over a footprint of 4108 deg2. Our theory modeling includes the impact of realistic true redshift distributions beyond Gaussian photo-z approximation. ζp is obtained by projecting the three-dimensional correlation to the transverse direction. To increase the signal-to-noise of the measurements, we have considered a Gaussian stacking window function in place of the commonly used top-hat. ζp is sensitive to DM(zeff)/rs, the ratio between the comoving angular diameter distance and the sound horizon. Using the full sample, DM(zeff)/rs is constrained to be 19.00±0.67 (top-hat) and 19.15±0.58 (Gaussian) at zeff=0.835. The constraint is weaker than the angular correlation w constraint (18.84±0.50), and we trace this to the fact that the BAO signals are heterogeneous across redshift. While ζp responds to the heterogeneous signals by enlarging the error bar, w can still give a tight bound on DM/rs in this case. When a homogeneous BAO-signal subsample in the range 0.7<zp<1.0 (zeff=0.845) is considered, ζp yields 19.80±0.67 (top-hat) and 19.84±0.53 (Gaussian). The latter is mildly stronger than the w constraint (19.86±0.55). We find that the ζp results are more sensitive to photo-z errors than w because ζp keeps the three-dimensional clustering information causing it to be more prone to photo-z noise. The Gaussian window gives more robust results than the top-hat as the former is designed to suppress the low signal modes. ζp and the angular statistics such as w have their own pros and cons, and they serve an important crosscheck with each other.
| Type: | Article |
|---|---|
| Title: | Dark Energy Survey Year 3 results: Measurement of the baryon acoustic oscillations with three-dimensional clustering |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevD.106.123502 |
| Publisher version: | https://doi.org/10.1103/PhysRevD.106.123502 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| 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/10162126 |
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