TRIS. I. Absolute Measurements of the Sky Brightness Temperature at 0.6, 0.82, and 2.5 GHz
TRIS. I. Absolute Measurements of the Sky Brightness Temperature at 0.6, 0.82, and 2.5 GHz
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特里斯。
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
F. Cavaliere
中科院分区：
文献类型：
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作者：
M. Zannoni;A. Tartari;M. Gervasi;G. Boella;G. Sironi;A. Lucia;A. Passerini;F. Cavaliere
在接近 1 GHz 的频率下，天空漫射辐射是银河起源的辐射、3 K 遗迹或宇宙微波背景辐射以及未解析的河外源产生的信号的叠加。由于它们的起源和空间分布不同，这三个组成部分的相对重要性随频率而变化，并且取决于观察的方向。为了理清这些组件，我们构建了 TRIS（一个由三个辐射计组成的系统），并使用具有相同波束（HPBW = 18° × 23°）的几何比例天线研究了 ν = 0.6、0.82 和 2.5 GHz 下的天空温度。观测包括沿恒定赤纬 δ = + 42° 的圆进行漂移扫描，这提供了天空信号对赤经的依赖性，以及沿同一扫描圆选定点的天空温度的绝对测量。 TRIS 安装在意大利中部的 Campo Imperatore（北纬 = 42°26′，经度 = 13°33′，海拔 = 2000 米），靠近格兰萨索实验室。
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 ν = 0.6, 0.82, and 2.5 GHz using geometrically scaled antennas with identical beams (HPBW = 18° × 23°). Observations included drift scans along a circle at constant declination δ = + 42°, 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 (latitude = 42°26′ north, longitude = 13°33′, elevation = 2000 m a.s.l.) in central Italy, close to the Gran Sasso Laboratory.