TY - JOUR
T1 - Mito measurements of the Sunyaev-Zeldovich effect in the Coma Cluster of galaxies
AU - De Petris, Marco
AU - D'Alba, Livia
AU - Lamagna, Luca
AU - Melchiorri, Francesco
AU - Orlando, Angiola
AU - Palladino, Emilia
AU - Rephaeli, Yoel
AU - Colafrancesco, Sergio
AU - Kreysa, Ernst
AU - Signore, Monique
N1 - Funding Information:
Contributions to the success of the MITO program were made by many scientists; in particular, we are grateful to S. Masi, who designed and built the cryogenic He-3 system; P. Lubin, who kindly supplied a low-noise cryogenic field effect transistor (FET); T. Encrenaz, for her far-IR spectra of planets; and P. de Bernardis, for various useful suggestions. This work has been supported by CNR (Testa Grigia Laboratory is a facility of Sezione IFSI in Turin) COFIN-MIUR 1998 and 2000, by ASI contract BAR, and by a NATO grant.
PY - 2002/8/1
Y1 - 2002/8/1
N2 - 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.
AB - 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.
KW - Cosmic microwave background
KW - Cosmology: observations
KW - Galaxies: clusters: individual (Abell 1656)
UR - http://www.scopus.com/inward/record.url?scp=0012031637&partnerID=8YFLogxK
U2 - 10.1086/342418
DO - 10.1086/342418
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AN - SCOPUS:0012031637
SN - 0004-637X
VL - 574
SP - L119-L122
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2 II
ER -