TRIS

Overview

The TRIS experiment performed absolute measurements of the sky brightness in a sky circle at declination +42 degrees at the frequencies 0.60, 0.82, and 2.5 GHz, using geometrically scaled antennas with identical beams (HPBW 18 degrees x 23 degrees). The TRIS group used the data to separate the different contributions to the sky emission and to evaluate the absolute temperature of the CMB at 0.60, 0.82 and 2.5 GHz.

Zannoni et al. 2008 ApJ 688, 12, ADS; Gervasi et al. 2008, ApJ, 688, 24, ADS; Tartari et al. 2008, ApJ, 688, 32, ADS.

Recent and most sensitive CMB temperature measurements below 5 GHz. TRIS data are marked as open squares. An improvement of more than a factor of 10 was gained at frequencies below 1 GHz. The horizontal solid line is the CMB temperature obtained by FIRAS at higher frequencies. See Gervasi et al. 2008. The data plotted are available here.
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Image of TRIS Results Summary (Zannoni et al. 2008, Table 14).
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Experiment Information:

• Experiment Date Range in Years: 1994 - 2001
• Frequency (GHz): 0.6, 0.82, 2.5
• l-min: n/a
• l-max: n/a