Three-Point Correlations in the COBE DMR 2 Year Anisotropy Maps
نویسندگان
چکیده
منابع مشابه
2-Point Correlations in the COBE DMR 4-Year Anisotropy Maps
The 2-point temperature correlation function is evaluated from the 4-year COBE DMR microwave anisotropy maps. We examine the 2-point function, which is the Legendre transform of the angular power spectrum, and show that the data are statistically consistent from channel to channel and frequency to frequency. The most likely quadrupole normalization is computed for a scale-invariant power-law sp...
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After the detection of structure in the microwave sky, the characterization of the observed features may be a useful guide to current and future experiments. The first year COBE DMR sky maps were analyzed in order to identify the most significant hot and cold spots. The statistical significance of potential spots of cosmic origin was evaluated with Monte Carlo simulations. The area, eccentricit...
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A statistical analysis of texture on the COBE-DMR rst year sky maps based on the genus and spot number is presented. A generalized 2 statistic is de ned in terms of \observable" quantities: the genus and spot density that would be measured by di erent cosmic observers. This strategy together with the use of Monte Carlo simulations of the temperature uctuations, including all the relevant experi...
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We employ a pixel-based likelihood technique to estimate the angular power spectrum of the COBE Differential Microwave Radiometer (DMR) 4-year sky maps. The spectrum is consistent with a scale-invariant power-law form with a normalization, expressed in terms of the expected quadrupole anisotropy, of Qrms−PS|n=1 = 18 ± 1.4 μK, and a best-fit spectral index of 1.2 ± 0.3. The normalization is some...
متن کاملThe complete bispectrum of COBE-DMR Four Year Maps
We extend a previous bispectrum analysis of the COBE-DMR 4 year maps, allowing for the presence of correlations between all possible angular scales. We find that the non-Gaussian signal found earlier for bispectrum components including adjacent modes does not extend to triplets of modes with larger separations. Indeed for all separations ∆l > 1 we find that the COBE-DMR data is very Gaussian. T...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1995
ISSN: 0004-637X,1538-4357
DOI: 10.1086/187932