Noncosmological signal contributions to the COBE DMR 4 year skymaps

Journal Article · Mon Jan 08 00:00:00 EST 1996 · Astrophysical Journal

DOI:https://doi.org/10.1086/310235· OSTI ID:894240

Banday, A J; Gorski, K M; Bennett, C L; Hinshaw, G; Kogut, A; Smoot, G F

We limit the possible contributions from noncosmological sources to the COBE Differential Microwave Radiometer (DMR) 4 year skymaps. The DMR data are cross-correlated with maps of rich clusters, extragalactic IRAS sources, HEAO I A-2 X-ray emission, and 5 GHz radiosources using a Fourier space technique. There is no evidence of significant contamination by such sources at an rms level of similar to 8mu K [95 percent confidence level (c.l.) at 70 resolution]in the most sensitive 53 GHz sky map. This level is consistent with previous limits set by analysis of earlier DMR data and by simple extrapolations from existing source models. We place a limit on the rms Comptonization parameter averaged over the high-latitude sky of delta gamma<1 x10(-6) (95 percent c.l.). Extragalactic sources have an insignificant effect on the cosmic microwave background power spectrum parameterizations determined from the DMR data.

• Research Organization: COLLABORATION - NASA
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 894240
• Report Number(s): LBNL--61839
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Vol. 468; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONTAMINATION
RADIOMETERS
RELICT RADIATION
SKY