Measuring $\Omega$ 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...

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Detalles Bibliográficos
Autores principales: Ferreira, P.G., Davis, M., Feldman, H.A., Jaffe, Andrew H., Juszkiewicz, R.
Lenguaje:eng
Publicado: 1999
Materias:
Astrophysics and Astronomy
Acceso en línea:http://cds.cern.ch/record/384037
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author Ferreira, P.G.
Davis, M.
Feldman, H.A.
Jaffe, Andrew H.
Juszkiewicz, R.
author_facet Ferreira, P.G.
Davis, M.
Feldman, H.A.
Jaffe, Andrew H.
Juszkiewicz, R.
author_sort Ferreira, P.G.
collection CERN
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 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
id cern-384037
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1999
record_format invenio
spelling cern-3840372021-10-08T02:31:21Zhttp://cds.cern.ch/record/384037engFerreira, P.G.Davis, M.Feldman, H.A.Jaffe, Andrew H.Juszkiewicz, R.Measuring $\Omega$ with Galaxy Streaming VelocitiesAstrophysics and AstronomyThe 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 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 errorsThe 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 errorsastro-ph/9904074CERN-TH-99-66CERN-TH-99-066oai:cds.cern.ch:3840371999-04-07
spellingShingle Astrophysics and Astronomy
Ferreira, P.G.
Davis, M.
Feldman, H.A.
Jaffe, Andrew H.
Juszkiewicz, R.
Measuring $\Omega$ with Galaxy Streaming Velocities
title Measuring $\Omega$ with Galaxy Streaming Velocities
title_full Measuring $\Omega$ with Galaxy Streaming Velocities
title_fullStr Measuring $\Omega$ with Galaxy Streaming Velocities
title_full_unstemmed Measuring $\Omega$ with Galaxy Streaming Velocities
title_short Measuring $\Omega$ with Galaxy Streaming Velocities
title_sort measuring $\omega$ with galaxy streaming velocities
topic Astrophysics and Astronomy
url http://cds.cern.ch/record/384037
work_keys_str_mv AT ferreirapg measuringomegawithgalaxystreamingvelocities
AT davism measuringomegawithgalaxystreamingvelocities
AT feldmanha measuringomegawithgalaxystreamingvelocities
AT jaffeandrewh measuringomegawithgalaxystreamingvelocities
AT juszkiewiczr measuringomegawithgalaxystreamingvelocities

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