Improving baryon acoustic oscillation measurement with the combination of cosmic voids and galaxies
Por:
Zhao, Cheng, Chuang, Chia-Hsun, Kitaura, Francisco-Shu, Liang, Yu, Pellejero-Ibanez, Marcos, Tao, Charling, Vargas-Magaa, Mariana, Variu, Andrei, Yepes, Gustavo
Publicada:
1 ene 2020
Resumen:
We develop a methodology to optimize the measurement of baryon acoustic
oscillation (BAO) from a given galaxy sample. In our previous work, we
demonstrated that one can measure BAO from tracers in underdense regions
(voids). In this study, we combine the overdense and underdense tracers
(galaxies and voids) to obtain better constraints on the BAO scale. To
this end, we modify the de-wiggled BAO model with an additional
parameter to describe both the BAO peak and the underlying exclusion
pattern of void 2PCFs. We show that after applying BAO reconstruction to
galaxies, the BAO peak scale of both galaxies and voids are unbiased
using the modified model. Furthermore, we use a new 2PCF estimator for a
multitracer analysis with galaxies and voids. In simulations, the joint
sample improves by about 10 per cent the constraint for the
post-reconstruction BAO peak position compared to the result from
galaxies alone, which is equivalent to an enlargement of the survey
volume by 20 per cent. Applying this method to the BOSS DR12 data, we
have an 18 per cent improvement for the low-z sample (0.2 < z< 0.5), but
a worse constraint for the high-z sample (0.5 < z < 0.75), which is
consistent with statistical fluctuations for the current survey volume.
Future larger samples will give more robust improvements due to less
statistical fluctuations.
Filiaciones:
Zhao, Cheng:
Ecole Polytech Fed Lausanne, Lab Astrophys, Observ Sauverny, CH-1290 Versoix, Switzerland
Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China
Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Chuang, Chia-Hsun:
Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA
Stanford Univ, Phys Dept, Stanford, CA 94305 USA
Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
Kitaura, Francisco-Shu:
IAC, C Via Lactea S-N, E-38200 Tenerife, Spain
Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain
Liang, Yu:
Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China
Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
Pellejero-Ibanez, Marcos:
IAC, C Via Lactea S-N, E-38200 Tenerife, Spain
Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain
Tao, Charling:
Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China
Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
Univ Aix Marseille, CPPM, CNRS, IN2P3, Case 907, F-13288 Marseille 9, France
Vargas-Magaa, Mariana:
Univ Nacl Autonoma Mexico, Inst Fis, Apdo Postal 20-364, Mexico City, DF, Mexico
Variu, Andrei:
Ecole Polytech Fed Lausanne, Lab Astrophys, Observ Sauverny, CH-1290 Versoix, Switzerland
Yepes, Gustavo:
Univ Autonoma Madrid, Fac Ciencias, Dept Fis Teor, Modulo 8, E-28049 Madrid, Spain
|