Spectral and spatial fluctuations of cosmic microwave background radiation. RATAN-600 radio telescope observations with a Fourier spectral analyzer |
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Authors: | A P Venger I V Gosachinskij V K Dubrovich |
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Institution: | 1.Special Astrophysical Observatory, St. Petersburg Branch,Russian Academy of Sciences,St. Petersburg,Russia |
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Abstract: | The “circumpolar survey” technique allowed us to achieve a rather high antenna temperature sensitivity of 0.5 mK at 6 cm on
a fixed antenna with a relatively narrow frequency resolution band (600 kHz) and an angular resolution of 45″ × 7′. Starting
from 2007 we use a Fourier spectral analyzer with a survey band 10 times broader than that of previous observations. This
upgrade allowed us to rapidly perform repeated test observations, which confirmed the power-law nature and the frequency structure
of spatial spectra in two strips in the vicinity of the celestial pole in the 4′–16′ interval of angular periods. These observations
also showed that the Galactic CH molecular line that was by chance captured in our survey strip (Λ-doubling of rotational
transition) has nothing to do with the emission spectra we obtained. The angular pattern of emission in two main lines of
Λ-doubling (4847.84 and 4870.12 MHz) is absolutely different, whereas there is practically no maser amplification in the CH
line to explain this fact. Our observations also confirm the H110 α line (4874.157 MHz), which forms in the tenuous ionized Galactic hydrogen at such relatively high latitudes. Other features
of the spatial spectra also appear to be quite real, although their interpretation remains unclear and requires further studies. |
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