Measuring the Mach number of the Universe via the Sunyaev-Zeldovich effect
We introduce a new statistic to measure more accurately the cosmic sound speed of clusters of galaxies at different redshifts. This statistic is evaluated by cross-correlating cosmic microwave background (CMB) fluctuations caused by the Sunyaev-Zel'dovich effect from observed clusters of galaxi...
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ftdatacite:10.48550/arxiv.astro-ph/0312394 2023-05-15T18:22:36+02:00 Measuring the Mach number of the Universe via the Sunyaev-Zeldovich effect Atrio--Barandela, F. Kashlinsky, A. Mücket, J. P. 2003 https://dx.doi.org/10.48550/arxiv.astro-ph/0312394 https://arxiv.org/abs/astro-ph/0312394 unknown arXiv https://dx.doi.org/10.1086/382154 Assumed arXiv.org perpetual, non-exclusive license to distribute this article for submissions made before January 2004 http://arxiv.org/licenses/assumed-1991-2003/ Astrophysics astro-ph FOS Physical sciences article-journal Article ScholarlyArticle Text 2003 ftdatacite https://doi.org/10.48550/arxiv.astro-ph/0312394 https://doi.org/10.1086/382154 2022-04-01T16:35:07Z We introduce a new statistic to measure more accurately the cosmic sound speed of clusters of galaxies at different redshifts. This statistic is evaluated by cross-correlating cosmic microwave background (CMB) fluctuations caused by the Sunyaev-Zel'dovich effect from observed clusters of galaxies with their redshifts. When clusters are distributed in redshift bins of narrow width, one could measure the mean squared cluster peculiar velocity with an error σ_{C_S^2}\lsim (300{\rm km/s})^2. This can be done around z>0.3 with clusters of flux above 200 mJy which will be detected by PLANCK, coupled with high resolution microwave images to eliminate the cosmological part of the CMB fluctuations. The latter can be achieved with observations by the planned ALMA array or the NSF South Pole telescope and other surveys. By measuring the cosmic sound speed and the bulk flow in, e.g., 4 spheres of ~ 100h^{-1}Mpc at z=0.3, we could have a direct measurement of the matter density 0.21 : Ap.J.Letters, submitted Text South pole DataCite Metadata Store (German National Library of Science and Technology) South Pole |
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Astrophysics astro-ph FOS Physical sciences |
spellingShingle |
Astrophysics astro-ph FOS Physical sciences Atrio--Barandela, F. Kashlinsky, A. Mücket, J. P. Measuring the Mach number of the Universe via the Sunyaev-Zeldovich effect |
topic_facet |
Astrophysics astro-ph FOS Physical sciences |
description |
We introduce a new statistic to measure more accurately the cosmic sound speed of clusters of galaxies at different redshifts. This statistic is evaluated by cross-correlating cosmic microwave background (CMB) fluctuations caused by the Sunyaev-Zel'dovich effect from observed clusters of galaxies with their redshifts. When clusters are distributed in redshift bins of narrow width, one could measure the mean squared cluster peculiar velocity with an error σ_{C_S^2}\lsim (300{\rm km/s})^2. This can be done around z>0.3 with clusters of flux above 200 mJy which will be detected by PLANCK, coupled with high resolution microwave images to eliminate the cosmological part of the CMB fluctuations. The latter can be achieved with observations by the planned ALMA array or the NSF South Pole telescope and other surveys. By measuring the cosmic sound speed and the bulk flow in, e.g., 4 spheres of ~ 100h^{-1}Mpc at z=0.3, we could have a direct measurement of the matter density 0.21 : Ap.J.Letters, submitted |
format |
Text |
author |
Atrio--Barandela, F. Kashlinsky, A. Mücket, J. P. |
author_facet |
Atrio--Barandela, F. Kashlinsky, A. Mücket, J. P. |
author_sort |
Atrio--Barandela, F. |
title |
Measuring the Mach number of the Universe via the Sunyaev-Zeldovich effect |
title_short |
Measuring the Mach number of the Universe via the Sunyaev-Zeldovich effect |
title_full |
Measuring the Mach number of the Universe via the Sunyaev-Zeldovich effect |
title_fullStr |
Measuring the Mach number of the Universe via the Sunyaev-Zeldovich effect |
title_full_unstemmed |
Measuring the Mach number of the Universe via the Sunyaev-Zeldovich effect |
title_sort |
measuring the mach number of the universe via the sunyaev-zeldovich effect |
publisher |
arXiv |
publishDate |
2003 |
url |
https://dx.doi.org/10.48550/arxiv.astro-ph/0312394 https://arxiv.org/abs/astro-ph/0312394 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://dx.doi.org/10.1086/382154 |
op_rights |
Assumed arXiv.org perpetual, non-exclusive license to distribute this article for submissions made before January 2004 http://arxiv.org/licenses/assumed-1991-2003/ |
op_doi |
https://doi.org/10.48550/arxiv.astro-ph/0312394 https://doi.org/10.1086/382154 |
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1766202010311327744 |