Robustness of baryon acoustic oscillations measurements with photometric redshift uncertainties

Author:

Ishikawa Keitaro1ORCID,Sunayama Tomomi23,Nishizawa Atsushi J245ORCID,Miyatake Hironao256ORCID,Nishimichi Takahiro678

Affiliation:

1. Physics Department, Nagoya University , Furocho, Chikusa, Nagoya, Aichi 464-8602 , Japan

2. Kobayashi Maskawa Institute, Nagoya University , Furocho, Chikusa, Nagoya, Aichi 464-8602 , Japan

3. Department of Astronomy and Steward Observatory, University of Arizona , 933 N Cherry Ave, Tucson, AZ 85719 , USA

4. DX Center, Gifu Shotoku Gakuen University , 1-1 Takakuwanishi, Yanaizucho, Gifu 501-6194 , Japan

5. Institute for Advanced Research, Nagoya University , Furocho, Chikusa, Nagoya, Aichi 464-8602 , Japan

6. Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study (UTIAS), The University of Tokyo , Chiba 277-8583 , Japan

7. Department of Astrophysics and Atmospheric Sciences, Faculty of Science, Kyoto Sangyo University , Motoyama, Kamigamo, Kita-ku, Kyoto 603-8555 , Japan

8. Center for Gravitational Physics and Quantum Information, Yukawa Institute for Theoretical Physics, Kyoto University , Kyoto 606-8502 , Japan

Abstract

ABSTRACT We investigate the robustness of baryon acoustic oscillations (BAO) measurements with a photometric galaxy sample using mock galaxy catalogues with various sizes of photometric redshift (photo-z) uncertainties. We first conduct the robustness of BAO measurements, assuming we have a perfect knowledge of photo-z uncertainties. We find that the BAO shift parameter α can be constrained in an unbiased manner even for 3 per cent photometric redshift uncertainties up to z ∼ 1. For instance, α = 1.006 ± 0.078 with 95 per cent confidence level is obtained from 3 per cent photo-z uncertainty data at z = 1.03 using the sample of M* ≥ 1010.25 M⊙ h−2. We also find that a sparse galaxy sample, e.g. <2 × 10−4 [h Mpc−1]3, causes additional noise in the covariance matrix calculation and can bias the constraint on α. Following this, we look into the scenario where incorrect photometric redshift uncertainties are assumed in the fitting model. We find that underestimating the photo-z uncertainty leads to a degradation in the constraining power on α. However, the constrained value of α is not biased. We also quantify the constraining power on Ωm0 assuming the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST)-like covariance and find that the 95 per cent confidence level is σ(Ωm0) ∼ 0.03–0.05 corresponding to the photo-z uncertainties of 1–3 per cent, respectively. Finally, we examine whether the skewness in the photometric redshift can bias the constraint on α and confirm that the constraint on α is unbiased, even assuming a Gaussian photo-z uncertainty in our model.

Funder

Astronomical Society of Japan

JSPS

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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