Signal-to-Noise Eigenmode Analysis of the Two-Year COBE Maps
Abstract
To test best a theory of cosmic microwave background fluctuations, anisotropy maps [here the two-year Cosmic Background Explorer differential microwave radiometer (DMR) 53, 90, 31 GHz a and b and the Far-Infrared Survey (FIRS) 170 GHz maps] are expanded in a complete basis of linear combinations of pixel amplitudes-statistically independent for both the noise and the signal. Bayesian analysis of a 2-parameter inflation-inspired theory shows the overall band-power and spectral tilt index νΔT+1 for all maps agree within 1σ, \{\(1.1+/-0.1\)×10-5\}2 and 1.27+/-0.33 (compatible with inflation values, ~0.8-1.2) and S/N filtering of the DMR maps reveals the same large-scale structural features.
- Publication:
-
Physical Review Letters
- Pub Date:
- May 1995
- DOI:
- 10.1103/PhysRevLett.74.4369
- arXiv:
- arXiv:astro-ph/9407044
- Bibcode:
- 1995PhRvL..74.4369B
- Keywords:
-
- Astrophysics;
- General Relativity and Quantum Cosmology;
- High Energy Physics - Phenomenology
- E-Print:
- submitted to Phys.Rev.Letters, 4 pages, uuencoded compressed PostScript