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Measuring Baryon Acoustic Oscillations from the clustering of voids | | Yu Liang
; Cheng Zhao
; Chia-Hsun Chuang
; Francisco-Shu Kitaura
; Charling Tao
; | | Date: |
13 Nov 2015 | | Abstract: | We investigate the necessary methodology to optimally measure the baryon
acoustic oscillation (BAO) signal, from voids based on galaxy redshift
catalogues. To this end, we study the dependency of the BAO signal on the
population of voids classified by their sizes. We find for the first time the
characteristic features of the correlation function of voids including the
first robust detection of BAOs in mock galaxy catalogues. These show an
anti-correlation around the scale corresponding to the smallest size of voids
in the sample (the void exclusion effect), and dips at both sides of the BAO
peak, which can be used to determine the significance of the BAO signal without
any priori model. Furthermore, our analysis demonstrates that there is a scale
dependent bias for different populations of voids depending on the radius, with
the peculiar property that the void population with the largest BAO
significance corresponds to tracers with approximately zero bias on the largest
scales. We further investigate the methodology on an additional set of 1,000
realistic mock galaxy catalogues reproducing the SDSS-III/BOSS CMASS DR11 data,
to control the impact of sky mask and radial selection function. Our solution
is based on generating voids from randoms including the same survey geometry
and completeness, and a post-processing cleaning procedure in the holes and at
the boundaries of the survey. The methodology and optimal selection of void
populations validated in this work have been used to perform the first BAO
detection from voids in observations, presented in a companion paper. | | Source: | arXiv, 1511.4391 | | Services: | Forum | Review | PDF | Favorites | |
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