Wide-angle effects for peculiar velocities
Abstract
ABSTRACT The line-of-sight peculiar velocities of galaxies contribute to their observed redshifts, breaking the translational invariance of galaxy clustering down to a rotational invariance around the observer. This becomes important when the line-of-sight direction varies significantly across a survey, leading to what are known as ‘wide-angle’ effects in redshift-space distortions. Wide-angle effects will also be present in measurements of the momentum field, i.e. the galaxy density-weighted velocity field, in upcoming peculiar velocity surveys. In this work, we study how wide-angle effects modify the predicted correlation function and power spectrum for momentum statistics, both in autocorrelation and in cross-correlation with the density field. Using both linear theory and the Zel'dovich approximation, we find that deviations from the plane-parallel limit are large and could become important in data analysis for low-redshift surveys. We point out that even multipoles in the cross-correlation between density and momentum are non-zero regardless of the choice of line of sight, and therefore contain new cosmological information that could be exploited. We discuss configuration space, Fourier space, and spherical analyses; providing exact expressions in each case rather than relying on an expansion in small angles. We hope these expressions will be of use in the analysis of upcoming surveysmore »
- Authors:
-
[2]
- Theoretical Physics Department, CERN, CH-1211 Geneva 23, Switzerland, Berkeley Center for Cosmological Physics, University of California, Berkeley, CA 94720, USA
- Berkeley Center for Cosmological Physics, University of California, Berkeley, CA 94720, USA, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 93720, USA
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
- OSTI Identifier:
- 1810165
- Alternate Identifier(s):
- OSTI ID: 1737632
- Grant/Contract Number:
- AC02-05CH11231; 1713791
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 499 Journal Issue: 1; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; analytical methods; radial velocities; surveys; large-scale structure of the Universe
Citation Formats
Castorina, Emanuele, and White, Martin. Wide-angle effects for peculiar velocities. United Kingdom: N. p., 2020.
Web. doi:10.1093/mnras/staa2129.
Castorina, Emanuele, & White, Martin. Wide-angle effects for peculiar velocities. United Kingdom. https://doi.org/10.1093/mnras/staa2129
Castorina, Emanuele, and White, Martin. Fri .
"Wide-angle effects for peculiar velocities". United Kingdom. https://doi.org/10.1093/mnras/staa2129.
@article{osti_1810165,
title = {Wide-angle effects for peculiar velocities},
author = {Castorina, Emanuele and White, Martin},
abstractNote = {ABSTRACT The line-of-sight peculiar velocities of galaxies contribute to their observed redshifts, breaking the translational invariance of galaxy clustering down to a rotational invariance around the observer. This becomes important when the line-of-sight direction varies significantly across a survey, leading to what are known as ‘wide-angle’ effects in redshift-space distortions. Wide-angle effects will also be present in measurements of the momentum field, i.e. the galaxy density-weighted velocity field, in upcoming peculiar velocity surveys. In this work, we study how wide-angle effects modify the predicted correlation function and power spectrum for momentum statistics, both in autocorrelation and in cross-correlation with the density field. Using both linear theory and the Zel'dovich approximation, we find that deviations from the plane-parallel limit are large and could become important in data analysis for low-redshift surveys. We point out that even multipoles in the cross-correlation between density and momentum are non-zero regardless of the choice of line of sight, and therefore contain new cosmological information that could be exploited. We discuss configuration space, Fourier space, and spherical analyses; providing exact expressions in each case rather than relying on an expansion in small angles. We hope these expressions will be of use in the analysis of upcoming surveys for redshift-space distortions and peculiar velocities.},
doi = {10.1093/mnras/staa2129},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 499,
place = {United Kingdom},
year = {Fri Jul 24 00:00:00 EDT 2020},
month = {Fri Jul 24 00:00:00 EDT 2020}
}
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