Discrete source contributions to small-scale anisotropies of the microwave background
Discrete source contributions to small-scale anisotropies of the microwave background
复制标题
离散源对微波背景小尺度各向异性的贡献
DOI：
10.1086/167774
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
G. Zotti
中科院分区：
文献类型：
--
作者：
A. Franceschini;L. Toffolatti;L. Danese;G. Zotti
由于未解决的，随机分布的源的微波背景的温度波动已计算为一个宽的间隔角尺度（从几个弧秒到几十度）和波长范围从几厘米到低于1毫米。对于wavelenghts大于6厘米，目前的估计遵循几乎直接从观测到的射电源计数。通过适当考虑所有现有数据，外推的不确定性已减少到较小的尺度和较高的频率。仅在相对窄的频率范围内（从大约20到200 GHz），离散源对小于1度的尺度上的温度波动的贡献预期为小于0.00001的Δ T/T。集群的影响，可能会强烈增强波动至少在某些角度尺度上指出。最敏感的数据Δ T/T在6厘米的无线电源的相关函数提供了显着的限制。参考文献62篇。
The temperature fluctuations of the microwave background due to unresolved, randomly distributed sources have been computed for a wide interval of angular scales (from a few arcseconds to several tens of degrees) and for wavelengths ranging from several centimeters to below 1 mm. For wavelenghts greater than 6 cm, the present estimates follow almost directly from the observed radio source counts. By properly taking into account all of the available data, the uncertainties in the extrapolations have been reduced to smaller scales and higher frequencies. Only within a relatively narrow frequency range (from about 20 to 200 GHz) the contribution of discrete sources to the temperature fluctuations on scales of less that 1 deg is expected to be Delta T/T less than 0.00001. The effect of clustering that might strongly enhance fluctuations at least on some angular scales is noted. The most sensitive data on Delta T/T at 6 cm provide significant constraints on the correlation function of radio sources. 62 refs.