Microwave emission at high Galactic latitudes in the four-year DMRsky maps

Journal Article · Wed Jan 10 00:00:00 EST 1996 · Astrophysical Journal

DOI:https://doi.org/10.1086/310072· OSTI ID:894242

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

We use the COBE(8) Differential Microwave Radiometers (DMR)4 yr sky maps to model Galactic microwave emission at high latitudes (/b/>20 degrees). Cross-correlation of the DMR maps with Galactic template maps detects fluctuations in the high-latitude microwave sky brightness with the angular variation of the DIRBE far-infrared dust maps and a frequency dependence consistent with a superposition of dust and free-free emission. We find no significant correlations between the DMR maps and various synchrotron templates. On the largest angular scales (e.g., quadrupole), Galactic emission is comparable in amplitude to the anisotropy in the cosmic microwave background (CMB). The CMB quadrupole amplitude, after correction for Galactic emission, has amplitude Q(rms) =10.7 mu K with random uncertainty 3.6 mu K and systematic uncertainty 7.1mu K from uncertainty in our knowledge of Galactic microwave emission.

• Research Organization: COLLABORATION - NASA
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 894242
• Report Number(s): LBNL--61841
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Vol. 464; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
AMPLITUDES
ANISOTROPY
BRIGHTNESS
DUSTS
FLUCTUATIONS
FREQUENCY DEPENDENCE
QUADRUPOLES
RADIOMETERS
RELICT RADIATION
SKY
SYNCHROTRONS