On the RMS Anisotropy at 7deg and 10deg Observed in the COBE-DMR Two Year Sky Maps
Abstract
The frequency-independent RMS temperature fluctuations determined from the COBE DMR two year sky maps are used to infer the normalization, Q_{rms-PS}, for models of primordial cosmological temperature anisotropy. A `cross'-RMS statistic is used to determine Q_{rms-PS} for a forced fit to a scale-invariant Harrison-Zel'dovich (n = 1) spectral model. The joint analysis of 7deg and 10deg RMS temperature anisotropy derived from the 53 and 90 GHz sky maps yields Q_{rms-PS} = 17.0(+2.5}_{-2.1) mu K when the low quadrupole is included, and Q_{rms-PS} = 19.4(+2.3}_{-2.1) mu K excluding the quadrupole. The effect of the low quadrupole derived from the COBE DMR data on the inferred Q_{rms-PS} normalization is investigated. A bias to lower Q_{rms-PS} is found when the quadrupole is included. The higher normalization for a forced n = 1 fit is then favored by the cross-RMS technique. The Q_{rms-PS} normalization derived for other cosmological models (CDM etc.) is reported. The National Aeronautics and Space Administration/Goddard Space Flight Center (NASA/GSFC) is responsible for the design, development, and operation of the Cosmic Background Explorer (COBE). Scientific guidance is provided by the COBE Science Working Group.
- Publication:
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American Astronomical Society Meeting Abstracts
- Pub Date:
- December 1994
- DOI:
- 10.48550/arXiv.astro-ph/9408097
- arXiv:
- arXiv:astro-ph/9408097
- Bibcode:
- 1994AAS...185.5701B
- Keywords:
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- Astrophysics
- E-Print:
- 15 pages including 3 tables and 3 figures, uuencoded Postscript