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Microwave Background Spectrum - Survey of Recent Results

Published online by Cambridge University Press:  14 August 2015

E. I. Robson  and
P. E. Clegg
E. I. Robson
Affiliation:
Physics Department, Queen Mary College, London.
P. E. Clegg
Affiliation:
Physics Department, Queen Mary College, London.

Extract

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For those enamoured of the primaeval fireball, the relict radiation has proved a tantalising mistress. Since the famous discovery in 1965, by Penzias and Wilson, of an excess antenna temperature consistent with cosmological expectations, many observers have succeeded in measuring a flux consistent with a thermodynamic temperature of ∼3K. Until recently, however, no direct spectral measurements had been made at wavelengths shorter than the Planckian peak corresponding to radiation at this temperature. At such wavelengths atmospheric emission and absorption are overwhelming from even the highest mountain site and observations must be made from at least balloon platforms. The pioneering broadband rocket and balloon measurements covering this wavelength region produced consternation when excessively high fluxes were reported; successive flights gradually eliminated the excess, emphasising the practical difficulties of such observations. A review of this phase of the pursuit is given by Blair1. Nevertheless, it is upon direct submillimetre measurement of the spectral density Iν that confidence in the interpretation of the longer wavelength results must reside. The outcome of the first such measurement, by Queen Mary College in 1974, seemed completely to justify such confidence. Unfortunately, the subsequent observations by Berkeley, although leading to the same conclusion about the value of the thermodynamic temperature, were so discrepant in detail from those of QMC as once again to raise doubts. We have since been eagerly awaiting the results of observations by independent groups but these have been frustrated by instrumental failures. We attempt here to assess the present situation. We conclude that although present measurements indicate a flux not inconsistent with a Planckian spectrum corresponding to a temperature of ∼3K, they do not demand such an interpretation. Moreover, because we may not actually expect a Planckian curve from a fireball, very much more detailed information is needed to obtain a view of the early thermal history of the universe.

Type
VI. Microwave Background Radiation
Information
Symposium - International Astronomical Union , Volume 74: Radio Astronomy and Cosmology , 1977 , pp. 319 - 325
Copyright
Copyright © Reidel 1977 

References

Blair, A.G. in “IAU Symposium No. 63”, ed. Longair, M. S., D. Reidel, 1974, p. 143.Google Scholar
Howell, T.F. and Shakeshaft, J.R., Nature 216, 753 (1967)CrossRefGoogle Scholar
Penzias, A.A. and Wilson, R.W., Ap.J. 72, 315 (1967)Google Scholar
Howell, T.F. and Shakeshaft, J.R., Nature 210, 1318 (1966)Google Scholar
Pelyushenko, S.A. and Stankevich, K.S., Soviet Astron. 13, 223 (1969)Google Scholar
Penzias, A.A. and Wilson, R.W., Ap.J. 142, 419 (1965)Google Scholar
Roll, P.G. and Wilkinson, D.T., Phys.Rev.Lett. 16, 405 (1966)CrossRefGoogle Scholar
Stokes, R.A., Partridge, R.B. and Wilkinson, D.T., Phys.Rev.Lett. 19, 1199 (1967)Google Scholar
Welch, W.J., Keachie, S., Thornton, D.D. and Wrixon, G., Phys.Rev.Lett. 18, 1068 (1967)CrossRefGoogle Scholar
Ewing, M.S., Burke, B.F. and Staelin, D.H., Phys.Rev.Lett. 19, 1251 (1967)CrossRefGoogle Scholar
Wilkinson, D.T., Phys.Rev.Lett. 19, 1195 (1967)CrossRefGoogle Scholar
Puzanov, V.I., Salomonovich, A.E. and Stankevich, K.S., Soviet Astron. 11, 905 (1968)Google Scholar
Kislyakov, A.G., Chernyshev, V.I., Lebskii, Yu.V., Mal'tsev, V.A. and Serov, N.V., Soviet Astron. 15, 29 (1971)Google Scholar
Boynton, P.E., Stokes, R.A. and Wilkinson, D.T., Phys.Rev.Lett. 21, 462 (1968)Google Scholar
Millea, M.F., McColl, M., Pedersen, R.J. and Vernon, F.L., Phys.Rev.Lett. 26, 919 (1971)Google Scholar
Boynton, P.E. and Stokes, R.A., Nature 247, 528 (1974)Google Scholar
Dall'Oglio, G., Fonti, S., Melchiorri, B., Melchiorri, F., Natale, V., Lombardi, P., Trivero, P. and Sivertsen, S., Phys.Rev.D. 13, 1187 (1976)Google Scholar
Peebles, P.J.E., “Physical Cosmology”, Princeton, 1971.Google Scholar
Beery, J.G., Martin, T.Z., Nolt, I.G. and Wood, C.W., Nature 230, 36 (1971)Google Scholar
Nolt, I.G., Radostitz, J.V. and Donelly, R.J., Nature 236, 444 (1972)CrossRefGoogle Scholar
Beckman, J.E., Ade, P.A.R., Huizinga, J.S., Robson, E.I., Vickers, D.G. and Harries, J.E., Nature 237, 154 (1972)Google Scholar
Mather, J.C., Werner, M.W. and Richards, P.L., Ap.J. 170, L59 (1971)CrossRefGoogle Scholar
Thaddeus, P., Ann.Rev.Astron.Astrophys. 10, 305 (1972)Google Scholar
Muehlner, D.J. and Weiss, R., Phys.Rev.Lett. 30, 757 (1973)Google Scholar
Blair, A.G., Beery, J.G., Edeskuty, F., Hiebert, R.D., Shipley, J.P. and Williamson, K.D., Phys.Rev.Lett. 27, 1154 (1971)Google Scholar
Houck, J.R., Soifer, B.T. and Harwit, M., Ap.J. 178, L29 (1972)CrossRefGoogle Scholar
Bortolot, V.J., Clauser, J.F. and Thaddeus, P., Phys.Rev.Lett. 22, 307 (1969)Google Scholar
Heygi, D.J., Traub, W.A. and Carleton, N.P., Phys.Rev.Lett. 28, 1541 (1972)Google Scholar
Heygi, D.J., Traub, W.A. and Carleton, N.P. Ap. J. 190, 543 (1974)Google Scholar
Robson, E.I., Vickers, D.G., Huizinga, J.S., Beckman, J.E. and Clegg, P.E., Nature 251, 591 (1974)CrossRefGoogle Scholar
Woody, D.P., Mather, J.C., Nishioka, N.S. and Richards, P.L. Phys. Rev. Lett. 34 1036 (1975)Google Scholar
In “Far Infrared Astronomy”, ed. Rowan-Robinson, M., Pergamon, 1976 p.143 ff.Google Scholar
Zel'dovich, Ya.B. and Sunyaev, R.A., Ap. and Space Sci. 4 301 (1969)Google Scholar
Chan, K.L. and Jones, B.J.T., Ap. J. 198, 245 (1975)Google Scholar