Observations of the CMB on Scales of 2° to 15&deg

Bibcode
1999IAUS..183..103D
Davies, R. D.; Davis, R. J.; Wilkinson, A.; Watson, R. A.; Melhuish, S. J.; Dicker, S.; Veeraraghavan, S.; Rebolo, R.; Gutierrez, C. M.; Hoyland, R. Y.; Lasenby, A. N.; Hancock, S.; Jones, A. W.; Rocha, G.
Bibliographical reference

"Cosmological Parameters and the Evolution of the Universe. Edited by Katsuhiko Sato. Publisher: Dordrecht, Boston: Kluwer Academic, 1999. ("Proceedings of the 183rd symposium of the International Astronomical Union held in Kyoto, Japan, August 18-22, 1997"., p. 103"

Advertised on:
0
1999
Number of authors
14
IAC number of authors
0
Citations
3
Refereed citations
0
Description
The Tenerife beam-switching radiometers have now surveyed an area of one steradian with a resolution of 5 deg to 15 deg. Observations with scaled antennas are made at 10, 15 and 33 GHz to distinguish intrinsic CMB and Galactic fluctuations. The 15 and 33 GHz sensitivity is 20 muK (deltaT/T = 7x10 exp-6) per beam area. These data are supplemented by the recently completed 33 GHz interferometer that explores scales of 2 deg. Our 33 GHz data is shown to be contaminated at a level less than 3 muK (deltaT/T less than 10exp-6) by Galactic synchrotron or free-free emission. The observational data set constrains the gravitational wave (vector) and the Sachs-Wolfe (scalar) contributions to the CMB fluctuations, when taken with COBE on scales of 10 deg to 90 deg. We find the spatial spectral index to be n = 1.1 plus/minus 0.1. Further observations on 1deg-2deg scales with the interferometer will constrain the position of the Doppler peak.
Type
Non-refereed

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