An estimate of Ω_m without priors
Using mean relative peculiar velocity measurements for pairs of galaxies, we estimate the cosmological density parameter $\Omega_m$ and the amplitude of density fluctuations $\sigma_8$. Our results suggest that our statistic is a robust and reproducible measure of the mean pairwise velocity and ther...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Journal article |
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2003
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| _version_ | 1797090262626861056 |
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| author | Feldman, H Juszkiewicz, R Ferreira, P Davis, M Gaztanaga, E Fry, J Jaffe, A Chambers, S Costa, L Bernardi, M Giovanelli, R Haynes, M Wegner, G |
| author_facet | Feldman, H Juszkiewicz, R Ferreira, P Davis, M Gaztanaga, E Fry, J Jaffe, A Chambers, S Costa, L Bernardi, M Giovanelli, R Haynes, M Wegner, G |
| author_sort | Feldman, H |
| collection | OXFORD |
| description | Using mean relative peculiar velocity measurements for pairs of galaxies, we estimate the cosmological density parameter $\Omega_m$ and the amplitude of density fluctuations $\sigma_8$. Our results suggest that our statistic is a robust and reproducible measure of the mean pairwise velocity and thereby the $\Omega_m$ parameter. We get $\Omega_m = 0.30^{+0.17}_{-0.07}$ and $\sigma_8 = 1.13^{+0.22}_{-0.23}$. These estimates do not depend on prior assumptions on the adiabaticity of the initial density fluctuations, the ionization history, or the values of other cosmological parameters. |
| first_indexed | 2024-03-07T03:16:00Z |
| format | Journal article |
| id | oxford-uuid:b5cb25b8-a5b0-4dfc-adee-bd4b4fa8e6c8 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T03:16:00Z |
| publishDate | 2003 |
| record_format | dspace |
| spelling | oxford-uuid:b5cb25b8-a5b0-4dfc-adee-bd4b4fa8e6c82022-03-27T04:36:23ZAn estimate of Ω_m without priorsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b5cb25b8-a5b0-4dfc-adee-bd4b4fa8e6c8Symplectic Elements at Oxford2003Feldman, HJuszkiewicz, RFerreira, PDavis, MGaztanaga, EFry, JJaffe, AChambers, SCosta, LBernardi, MGiovanelli, RHaynes, MWegner, GUsing mean relative peculiar velocity measurements for pairs of galaxies, we estimate the cosmological density parameter $\Omega_m$ and the amplitude of density fluctuations $\sigma_8$. Our results suggest that our statistic is a robust and reproducible measure of the mean pairwise velocity and thereby the $\Omega_m$ parameter. We get $\Omega_m = 0.30^{+0.17}_{-0.07}$ and $\sigma_8 = 1.13^{+0.22}_{-0.23}$. These estimates do not depend on prior assumptions on the adiabaticity of the initial density fluctuations, the ionization history, or the values of other cosmological parameters. |
| spellingShingle | Feldman, H Juszkiewicz, R Ferreira, P Davis, M Gaztanaga, E Fry, J Jaffe, A Chambers, S Costa, L Bernardi, M Giovanelli, R Haynes, M Wegner, G An estimate of Ω_m without priors |
| title | An estimate of Ω_m without priors |
| title_full | An estimate of Ω_m without priors |
| title_fullStr | An estimate of Ω_m without priors |
| title_full_unstemmed | An estimate of Ω_m without priors |
| title_short | An estimate of Ω_m without priors |
| title_sort | estimate of ω m without priors |
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