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29 March 2024
 
  » arxiv » astro-ph/9507015

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Omega from the COBE-DMR anisotropy maps
L. Cayon ; E. Martinez-Gonzalez ; J.L. Sanz ; N. Sugiyama ; S. Torres ;
Date 5 Jul 1995
Journal Mon.Not.Roy.Astron.Soc. 279 (1996) 1095
AbstractWe have made a likelihood statistical analysis of the angular correlations in the {it COBE}-DMR two-year sky maps by Monte Carlo simulation of the temperature fluctuations. We assume an open universe and consider as primordial power spectrum the Harrison-Zeldovich one, $P(k)=Ak$. We find that the flatness of the universe is not implied by the data. The quadrupole normalization amplitude, $Q_{rms-PS}$, is related to the density parameter, $Omega$, by $Q_{rms-PS} = 10.67 + 55.81 Omega - 128.59 Omega^2 + 81.26 Omega^3 mu$K. We have determined the p.d.f. of $Omega$ due to cosmic plus sampling (i.e. $20^circ$ galactic cut) variance which generically shows a bimodal shape. The uncertainty as given by the r.m.s. is $approx 0.35$, therefore to better constrain $Omega$ experiments sensitive to higher multipoles ($l>20$) should be considered.
Source arXiv, astro-ph/9507015
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