Mito measurements of the Sunyaev-Zeldovich effect in the Coma Cluster of galaxies

Marco De Petris, Livia D'Alba, Luca Lamagna, Francesco Melchiorri, Angiola Orlando, Emilia Palladino, Yoel Rephaeli, Sergio Colafrancesco, Ernst Kreysa, Monique Signore

Research output: Contribution to journalArticlepeer-review


We have measured the Sunyaev-Zeldovich (SZ) effect toward the Coma Cluster (A1656) with the Millimetre and Infrared Testagrigia Observatory experiment, a 2.6 m telescope equipped with a four-channel 17′ (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 SZ signal by employing a spatial and spectral decorrelation scheme to remove a dominant atmospheric component. The deduced values of the thermal SZ effect in the first three bands are ΔT0 = -179 ± 38, -33 ± 81, and 170 ± 35μK in the cluster center. The corresponding optical depth, τ = (4.1 ± 0.9) × 10-3, is consistent (within errors) with both the value from a previous low-frequency SZ measurement and the value predicted from the X-ray-deduced gas parameters.

Original languageEnglish
Pages (from-to)L119-L122
JournalAstrophysical Journal
Issue number2 II
StatePublished - 1 Aug 2002


  • Cosmic microwave background
  • Cosmology: observations
  • Galaxies: clusters: individual (Abell 1656)


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