Limits on ThreePoint Correlations in the COBE DMR FirstYear Anisotropy Maps
Abstract
We compute the threepoint temperature correlation function of the {\it COBE} Differential Microwave Radiometer (DMR) firstyear sky maps to search for nonGaussian temperature fluctuations. The level of fluctuations seen in the computed correlation function are too large to be attributable solely to instrument noise. However the fluctuations are consistent with the level expected to result from a superposition of instrument noise and sky signal arising from a Gaussian power law model of initial fluctuations, with a quadrupole normalized amplitude of 17 $\mu$K and a power law spectral index $n = 1$. We place limits on the amplitude of intrinsic threepoint correlations with a variety of predicted functional forms.
 Publication:

The Astrophysical Journal
 Pub Date:
 August 1994
 DOI:
 10.1086/174462
 arXiv:
 arXiv:astroph/9311030
 Bibcode:
 1994ApJ...431....1H
 Keywords:

 Computational Astrophysics;
 Data Correlation;
 Sky Surveys (Astronomy);
 Temperature Distribution;
 Cosmic Background Explorer Satellite;
 Cosmology;
 Microwave Radiometers;
 Power Spectra;
 Signal To Noise Ratios;
 Astrophysics;
 COSMOLOGY: COSMIC MICROWAVE BACKGROUND;
 COSMOLOGY: OBSERVATIONS;
 Astrophysics
 EPrint:
 14 pages, 2 figures, uuencoded Postscript, COBE #9312