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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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