MITO measurements of the Sunyaev-Zeldovich effect in the Coma cluster of galaxies
Mar, 2002
4 pages
Published in:
- Astrophys.J.Lett. 574 (2002) L119-L122
e-Print:
- astro-ph/0203303 [astro-ph]
DOI:
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Abstract: (arXiv)
We have measured the Sunyaev-Zeldovich effect towards the Coma cluster (A1656) with the MITO experiment, a 2.6-m telescope equipped with a 4-channel 17 arcminute (FWHM) photometer. Measurements at frequency bands 143+/-15, 214+/-15, 272+/-16 and 353+/-13 GHz, were made during 120 drift scans of Coma. We describe the observations and data analysis that involved extraction of the S-Z signal by employing a spatial and spectral de-correlation scheme to remove a dominant atmospheric component. The deduced values of the thermal S-Z effect in the first three bands are DT_{0} = -179+/-38,-33+/-81,170+/-35 microKelvin in the cluster center. The corresponding optical depth, tau=(4.1+/-0.9) 10^{-3}, is consistent (within errors) with both the value from a previous low frequency S-Z measurement, and the value predicted from the X-ray deduced gas parameters.- COSMOLOGY
- CMB
- A1656
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