We report on the first analysis of the data of the ARGO 1993 experiment: a ballon-borne search for Cosmic Microwave Background (CMB) anisotropies, carried out by means of a 1.2m telescope and a four bands bolometric photometer. The experiment has scanned the Hercules region, with an angular resolution of 52 arcmin. FWHM, in four photometric bands at 2.0, 1.2, 0.8 and 0.5 mm. 63 independent temperature differences have been measured, and a statistically significant temperature fluctuation has been observed above detector noise at 2.0 and 1.2 mm. The signal is spectrally consistent with CMB anisotropies, while local sources of anisotropy are excluded by means of spectral tests using the four photometeric channels. The data are compared with theoretical models, and are found to be in agreement with the CMB anisotropy detected by COBE at larger angular scales if a 'standard' CDM model is assumed. The comparison of ARGO and COBE data allows us to exclude reheating models.
Debernardis, P., Aquilini, E., De Petris, M., Dandreta, G., Gervasi, M., Masi, S., et al. (1995). The ARGO 1993 flight: Detection of CMB anisotropies at angular scales around one degree. ASTROPHYSICAL LETTERS & COMMUNICATIONS, 32(1-6), 229-237.
The ARGO 1993 flight: Detection of CMB anisotropies at angular scales around one degree
GERVASI, MASSIMO;
1995
Abstract
We report on the first analysis of the data of the ARGO 1993 experiment: a ballon-borne search for Cosmic Microwave Background (CMB) anisotropies, carried out by means of a 1.2m telescope and a four bands bolometric photometer. The experiment has scanned the Hercules region, with an angular resolution of 52 arcmin. FWHM, in four photometric bands at 2.0, 1.2, 0.8 and 0.5 mm. 63 independent temperature differences have been measured, and a statistically significant temperature fluctuation has been observed above detector noise at 2.0 and 1.2 mm. The signal is spectrally consistent with CMB anisotropies, while local sources of anisotropy are excluded by means of spectral tests using the four photometeric channels. The data are compared with theoretical models, and are found to be in agreement with the CMB anisotropy detected by COBE at larger angular scales if a 'standard' CDM model is assumed. The comparison of ARGO and COBE data allows us to exclude reheating models.
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