Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-05-18
Mon.Not.Roy.Astron.Soc. 312 (2000) 159-165
Astronomy and Astrophysics
Astrophysics
7 pages, 2 figures. Version accepted for MNRAS. Minor expansion of text in some sections
Scientific paper
10.1046/j.1365-8711.2000.03131.x
We derive analytic expressions for the leading-order corrections to the polarization induced in the cosmic microwave background (CMB) due to scattering off hot electrons in galaxy clusters along the line of sight. For a thermal distribution of electrons with a kinetic temperature of 10 keV and a bulk peculiar velocity of 1000 km/s, the dominant corrections to the polarization induced by the primordial CMB quadrupole and the cluster peculiar velocity arise from electron thermal motion and are at the level of 10 per cent in each case, near the peak of the polarization signal. When more sensitive measurements become feasible, these effects will be significant for the determination of transverse peculiar velocities, and the value of the CMB quadrupole at the cluster redshift, via the cluster polarization route.
Challinor Anthony
Ford Matthew
Lasenby Anthony
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