TRIS I: Absolute Measurements of the Sky Brightness Temperature at 0.6, 0.82 and 2.5 GHz

Abstract

At frequencies close to 1 GHz the sky diffuse radiation is a superposition of radiation of Galactic origin, the 3 K Relic or Cosmic Microwave Background Radiation, and the signal produced by unresolved extragalactic sources. Because of their different origin and space distribution the relative importance of the three components varies with frequency and depends on the direction of observation. With the aim of disentangling the components we built TRIS, a system of three radiometers, and studied the temperature of the sky at $\nu =0.6$, $\nu =0.82$ and $\nu =2.5$ GHz using geometrically scaled antennas with identical beams (HPBW = $18^{\circ }\times 23^{\circ }$). Observations included drift scans along a circle at constant declination $\delta =+42^{\circ }$ which provided the dependence of the sky signal on the Right Ascension, and absolute measurement of the sky temperature at selected points along the same scan circle. TRIS was installed at Campo Imperatore (lat. = $42^{\circ }26^{\prime }$ N, long.= $13^{\circ }33^{\prime }$, elevation = 2000 m a.s.l.) in Central Italy, close to the Gran Sasso Laboratory.

Accepted for publication in The Astrophysical Journal

References in corpus (4)

• The contribution of the Unresolved Extragalactic Radio Sources to the Brightness Temperature of the sky
• TRIS II: search for CMB spectral distortions at 0.60, 0.82 and 2.5 GHz
• ARCADE: Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission
• TRIS III: the diffuse galactic radio emission at $\delta =+42^{\circ }$

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