Measuring Ω with Galaxy Streaming Velocities
The mean pairwise velocity of galaxies has traditionally been estimated from the redshift space galaxy correlation function. This method is notorious for being highly sensitive to the assumed model of the pairwise velocity dispersion. Here we propose an alternative method to estimate the streaming v...
| Main Authors: | , , , , |
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| Format: | Book section |
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World Scientific
1999
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| _version_ | 1826262517491433472 |
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| author | Ferreira, P Davis, M Feldman, H Jaffe, A Juszkiewicz, R |
| author_facet | Ferreira, P Davis, M Feldman, H Jaffe, A Juszkiewicz, R |
| author_sort | Ferreira, P |
| collection | OXFORD |
| description | The mean pairwise velocity of galaxies has traditionally been estimated from the redshift space galaxy correlation function. This method is notorious for being highly sensitive to the assumed model of the pairwise velocity dispersion. Here we propose an alternative method to estimate the streaming velocity directly from peculiar velocity samples, which contain redshift-independent distances as well as galaxy redshifts. This method can provide an estimate of $\Omega^{0.6}\sigma_8^2$ for a range of $\sigma_8$ where $\Omega$ is the cosmological density parameter, while $\sigma_8$ is the standard normalization for the power spectrum of density fluctuations. We demonstrate how to measure this quantity from realistic catalogues and identify the main sources of bias and errors |
| first_indexed | 2024-03-06T19:37:26Z |
| format | Book section |
| id | oxford-uuid:1f83c5c3-3ba8-4aa8-be5a-270e46f11154 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T19:37:26Z |
| publishDate | 1999 |
| publisher | World Scientific |
| record_format | dspace |
| spelling | oxford-uuid:1f83c5c3-3ba8-4aa8-be5a-270e46f111542022-03-26T11:22:16ZMeasuring Ω with Galaxy Streaming VelocitiesBook sectionhttp://purl.org/coar/resource_type/c_3248uuid:1f83c5c3-3ba8-4aa8-be5a-270e46f11154Symplectic Elements at OxfordWorld Scientific1999Ferreira, PDavis, MFeldman, HJaffe, AJuszkiewicz, RThe mean pairwise velocity of galaxies has traditionally been estimated from the redshift space galaxy correlation function. This method is notorious for being highly sensitive to the assumed model of the pairwise velocity dispersion. Here we propose an alternative method to estimate the streaming velocity directly from peculiar velocity samples, which contain redshift-independent distances as well as galaxy redshifts. This method can provide an estimate of $\Omega^{0.6}\sigma_8^2$ for a range of $\sigma_8$ where $\Omega$ is the cosmological density parameter, while $\sigma_8$ is the standard normalization for the power spectrum of density fluctuations. We demonstrate how to measure this quantity from realistic catalogues and identify the main sources of bias and errors |
| spellingShingle | Ferreira, P Davis, M Feldman, H Jaffe, A Juszkiewicz, R Measuring Ω with Galaxy Streaming Velocities |
| title | Measuring Ω with Galaxy Streaming Velocities |
| title_full | Measuring Ω with Galaxy Streaming Velocities |
| title_fullStr | Measuring Ω with Galaxy Streaming Velocities |
| title_full_unstemmed | Measuring Ω with Galaxy Streaming Velocities |
| title_short | Measuring Ω with Galaxy Streaming Velocities |
| title_sort | measuring ω with galaxy streaming velocities |
| work_keys_str_mv | AT ferreirap measuringōwithgalaxystreamingvelocities AT davism measuringōwithgalaxystreamingvelocities AT feldmanh measuringōwithgalaxystreamingvelocities AT jaffea measuringōwithgalaxystreamingvelocities AT juszkiewiczr measuringōwithgalaxystreamingvelocities |