Towards a measurement of cluster gas temperatures using the relativistic Sunyaev-Zeldovich effect.

Luzzi G., Hincks A., GĂ©nova-Santos R.T., Battistelli E.S.

III - Astrofisica
Aula 32B-3 - Lunedì 17 h 16:00 - 19:00
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The hot gas in clusters of galaxies creates a distinctive spectral distortion in the cosmic microwave background (CMB) via the Sunyaev-Zel'dovich (SZ) effect. To first order, the shape of the spectral distortion is fixed, but relativistic corrections (rSZ) introduce a dependence on the gas temperature. In this work, we extract fluxes from a sample of hot clusters in the Planck maps and we are able to fit the rSZ directly and obtain gas temperatures which, though noisy, are consistent with X-ray temperatures. This is the first attempt to show evidence for the rSZ signature in individual Planck clusters.

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