The Redshift-space Momentum Power Spectrum. III. Measuring the Growth Rate from the SDSSv Survey Using the Auto- and Cross-power Spectrum of the Galaxy Density and Momentum Fields
The large-scale structure of the Universe and its evolution over time contains an abundance of cosmological information. One way to unlock this is by measuring the density and momentum power spectrum from the positions and peculiar velocities of galaxies and fitting the cosmological parameters from...
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad9391 |
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| author | Fei Qin Cullan Howlett David Parkinson |
| author_facet | Fei Qin Cullan Howlett David Parkinson |
| author_sort | Fei Qin |
| collection | DOAJ |
| description | The large-scale structure of the Universe and its evolution over time contains an abundance of cosmological information. One way to unlock this is by measuring the density and momentum power spectrum from the positions and peculiar velocities of galaxies and fitting the cosmological parameters from these power spectra. In this paper, we will explore the cross-power spectrum between the density and momentum fields of galaxies. We derive the estimator of the density–momentum cross-power spectrum multipoles. The growth rate of the large-scale structure, f σ _8 , is measured from fitting the combined density monopole, momentum monopole, and cross-dipole power spectrum. The estimators and models of the power spectrum as well as our fitting method have been tested using mock catalogs; we find that they perform well in recovering the fiducial values of the cosmological parameters of the simulations, and we also find that the errors of the parameters can be largely reduced by including the cross-power spectrum in the fit. We measure the autodensity, automomentum, and cross-power spectrum using the Sloan Digital Sky Survey Data Release 14 peculiar velocity catalog. The fit result of the growth rate f σ _8 is $f{\sigma }_{8}={0.413}_{-0.058}^{+0.050}$ at effective redshift z _eff = 0.073, and our measurement is consistent with the prediction of the Lambda cold dark matter cosmological model, assuming general relativity. |
| format | Article |
| id | doaj-art-9c03789dd4614e47aaf19410f2d20db2 |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2024-01-01 |
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| series | The Astrophysical Journal |
| spelling | doaj-art-9c03789dd4614e47aaf19410f2d20db22024-12-21T05:23:10ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-019781710.3847/1538-4357/ad9391The Redshift-space Momentum Power Spectrum. III. Measuring the Growth Rate from the SDSSv Survey Using the Auto- and Cross-power Spectrum of the Galaxy Density and Momentum FieldsFei Qin0https://orcid.org/0000-0001-7950-7864Cullan Howlett1https://orcid.org/0000-0002-1081-9410David Parkinson2https://orcid.org/0000-0002-7464-2351Aix-Marseille University , CNRS/IN2P3, CPPM, Marseille 13288, France ; qin@cppm.in2p3.fr; School of Physics, Korea Institute for Advanced Study , Dongdaemun-gu, Hoegiro 85, Seoul 02455, Republic of KoreaSchool of Mathematics and Physics, The University of Queensland , Brisbane, QLD 4072, AustraliaKorea Astronomy and Space Science Institute , Yuseong-gu, Daedeok-daero 776, Daejeon 34055, Republic of KoreaThe large-scale structure of the Universe and its evolution over time contains an abundance of cosmological information. One way to unlock this is by measuring the density and momentum power spectrum from the positions and peculiar velocities of galaxies and fitting the cosmological parameters from these power spectra. In this paper, we will explore the cross-power spectrum between the density and momentum fields of galaxies. We derive the estimator of the density–momentum cross-power spectrum multipoles. The growth rate of the large-scale structure, f σ _8 , is measured from fitting the combined density monopole, momentum monopole, and cross-dipole power spectrum. The estimators and models of the power spectrum as well as our fitting method have been tested using mock catalogs; we find that they perform well in recovering the fiducial values of the cosmological parameters of the simulations, and we also find that the errors of the parameters can be largely reduced by including the cross-power spectrum in the fit. We measure the autodensity, automomentum, and cross-power spectrum using the Sloan Digital Sky Survey Data Release 14 peculiar velocity catalog. The fit result of the growth rate f σ _8 is $f{\sigma }_{8}={0.413}_{-0.058}^{+0.050}$ at effective redshift z _eff = 0.073, and our measurement is consistent with the prediction of the Lambda cold dark matter cosmological model, assuming general relativity.https://doi.org/10.3847/1538-4357/ad9391Cosmological parametersCosmological modelsLarge-scale structure of the universeObservational cosmology |
| spellingShingle | Fei Qin Cullan Howlett David Parkinson The Redshift-space Momentum Power Spectrum. III. Measuring the Growth Rate from the SDSSv Survey Using the Auto- and Cross-power Spectrum of the Galaxy Density and Momentum Fields The Astrophysical Journal Cosmological parameters Cosmological models Large-scale structure of the universe Observational cosmology |
| title | The Redshift-space Momentum Power Spectrum. III. Measuring the Growth Rate from the SDSSv Survey Using the Auto- and Cross-power Spectrum of the Galaxy Density and Momentum Fields |
| title_full | The Redshift-space Momentum Power Spectrum. III. Measuring the Growth Rate from the SDSSv Survey Using the Auto- and Cross-power Spectrum of the Galaxy Density and Momentum Fields |
| title_fullStr | The Redshift-space Momentum Power Spectrum. III. Measuring the Growth Rate from the SDSSv Survey Using the Auto- and Cross-power Spectrum of the Galaxy Density and Momentum Fields |
| title_full_unstemmed | The Redshift-space Momentum Power Spectrum. III. Measuring the Growth Rate from the SDSSv Survey Using the Auto- and Cross-power Spectrum of the Galaxy Density and Momentum Fields |
| title_short | The Redshift-space Momentum Power Spectrum. III. Measuring the Growth Rate from the SDSSv Survey Using the Auto- and Cross-power Spectrum of the Galaxy Density and Momentum Fields |
| title_sort | redshift space momentum power spectrum iii measuring the growth rate from the sdssv survey using the auto and cross power spectrum of the galaxy density and momentum fields |
| topic | Cosmological parameters Cosmological models Large-scale structure of the universe Observational cosmology |
| url | https://doi.org/10.3847/1538-4357/ad9391 |
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