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Probing the evolution of the gas mass fraction with the Sunyaev-Zeldovich effect

Majumdar, Subhabrata (2001) Probing the evolution of the gas mass fraction with the Sunyaev-Zeldovich effect. In: The Astrophysical Journal, 555 (1, Par). L7-L10.

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Official URL: http://www.iop.org/EJ/abstract/1538-4357/555/1/L7/


Study of the primary anisotropies of the cosmic microwave background (CMB) can be used to determine the cosmological parameters to a very high precision. The power spectrum of the secondary CMB anisotropies due to the thermal Sunyaev-Zeldovich effect (SZE) by clusters of galaxies can then be studied, to constrain more cluster-specific properties (like gas mass). We show the SZE power spectrum from clusters to be a sensitive probe of any possible evolution (or constancy) of the gas mass fraction. The position of the peak of the SZE power spectrum is a strong scriminatory signature of different gas mass fraction evolution models. For example, for a flat universe, there can be a difference in the l-values (of the peak) of as much as 2500 between a constant gas mass fraction model and an evolutionary one. Moreover, observational determination of the power spectrum, from blank-sky surveys, is devoid of any selection effects that can possibly affect targeted X-ray or radio studies of gas mass fractions in galaxy clusters.

Item Type: Journal Article
Publication: The Astrophysical Journal
Publisher: Institute of physics
Additional Information: Copyright of this article belongs to American Astronomical Society.
Keywords: cosmic microwave background;cosmology : observations;cosmology : theory;galaxies : clusters : general
Department/Centre: Division of Physical & Mathematical Sciences > Astronomy and Astrophysics Programme
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 10 Feb 2010 07:25
Last Modified: 19 Sep 2010 04:56
URI: http://eprints.iisc.ac.in/id/eprint/17315

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