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Measuring the Mach number of the universe via the Sunyaev–Zel'dovich effect

Published online by Cambridge University Press:  06 October 2004

F. Atrio-Barandela
Affiliation:
Física Teórica. Facultad de Ciencias. 37008 Salamanca, Spain email: [email protected]
A. Kashlinsky
Affiliation:
SSAI, Code 685, Goddard Space Flight Center, Greenbelt, MD 20771
J.P. Mücket
Affiliation:
Astrophysikalisches Institut Potsdam, D-14482, Potsdam
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Abstract

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The cross-correlating cosmic microwave background (CMB) fluctuations caused by the Sunyaev-Zel'dovich effect from observed clusters of galaxies with their redshifts can be used to measure the mean squared cluster peculiar velocity with an error $\sigma_{C_S^2}\simeq (300{\rm km/s})^2$. This can be done around $z\gt0.3$ 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 rms peculiar velocity of clusters and their bulk flow in, e.g., 4 spheres of $\sim 100h^{-1}$ Mpc at $z=0.3$, we could have a direct measurement of the matter density $0.21\lt\Omega_m\lt0.47$ at 95% confidence level.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Copyright
© 2004 International Astronomical Union