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Book New Measurements of the Cosmic Background Radiation Temperature At3 3 Mm Wavelength

Download or read book New Measurements of the Cosmic Background Radiation Temperature At3 3 Mm Wavelength written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have measured the temperature of the cosmic background radiation (CBR) at 3.3 mm wavelength in 1982, 1983, and 1984 as part of a larger project to determine the CBR temperature at five wavelengths from 12 cm to 3.3 mm (Smoot et al. 1985). The 3.3-mm measurements yield a brightness temperature of 2.57 K with a 1[sigma] uncertainty of 20.12 K. This paper describes the instrument, the measurement techniques, and the data-analysis procedures used. Our result is in good agreement with recent measurements at comparable wavelengths by Meyer and Jura (1985) and by Peterson, Richards, and Timusk (1985), but it disagrees with the temperatures reported by Woody and Richards (1981).

Book A Measurement of the Cosmic Background Radiation Temperature At3 0 Cm

Download or read book A Measurement of the Cosmic Background Radiation Temperature At3 0 Cm written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We describe a measurement of the cosmic background radiation temperature at a wavelength of 3.0 cm. The experiment was made in conjunction with measurements at four other wavelengths in an effort to measure the long wavelength spectrum to high accuracy. The result at 3 cm, T{sub CBR} = 2.91 ± 0.19 K, is in good agreement with the values at neighboring wavelengths, and consistent with previous results.

Book Measurement of the Intensity of the Cosmic Background Radiation At3 7 GHz

Download or read book Measurement of the Intensity of the Cosmic Background Radiation At3 7 GHz written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We measured the temperature of the cosmic background radiation (CBR) at a frequency of 3.7 GHz (8.1 cm wavelength), using a total power, direct RF-gain receiver. The results give a brightness temperature, T{sub CBR}, of 2.58 ± 0.13 K (68% C.L.). Details of the instrument and of the experimental procedure are given. This measurement is part of a larger experiment to measure the spectrum of the Cosmic Background Radiation between 0.6 and 90 GHz (50 and 0.33 cm wavelength).

Book Measurements of the Cosmic Background Radiation Temperature at 3 3and 9 1 MM

Download or read book Measurements of the Cosmic Background Radiation Temperature at 3 3and 9 1 MM written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report the results of measurements of the cosmic background radiation temperature at wavelengths of 9.1 and 3.3 mm. The 9.1 mm result, T{sub CBR} = 2.87 ± 0.21 K, is in good agreement with previous results and those obtained at longer wavelengths during the same experiment. The 3.3 mm result, T{sub CBR} = 2.4 ± 1.0 K, is consistent with previous measurements, but has a large error due to uncertainty in the atmospheric correction.

Book Anisotropy Measurements of the Cosmic Background Radiation at 3 Mm Wavelength and an Angular Scale of 30 Arcminutes

Download or read book Anisotropy Measurements of the Cosmic Background Radiation at 3 Mm Wavelength and an Angular Scale of 30 Arcminutes written by Peter Russell Meinhold and published by . This book was released on 1990 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Measurements of the Cosmic Background Radiation

Download or read book Measurements of the Cosmic Background Radiation written by Jeffrey Arthur Schuster and published by . This book was released on 1994 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Long Wavelength Measurements of the Cosmic Microwave BackgroundRadiation Spectrum

Download or read book Long Wavelength Measurements of the Cosmic Microwave BackgroundRadiation Spectrum written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have measured the temperature of the cosmic microwave background radiation at wavelengths of 0.33, 3.0, 8.2 and 21.3 cm. These measurements represent a continuation of the work reported by Smoot et al. (1985). The new results have a weighted average of 2.70 ± 0.05 K and are consistent with past measurements. They limit the possible distortion of the cosmic microwave background radiation spectrum to less than 6%. The results of all measurements to date are consistent with a Planckian spectrum with temperature 2.74 ± 0.02 K spanning a wavelength range of 0.1 to 21 cm.

Book An Analysis of Recent Measurements of the Temperature of TheCosmic Microwave Background Radiation

Download or read book An Analysis of Recent Measurements of the Temperature of TheCosmic Microwave Background Radiation written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents an analysis of the results of recent temperature measurements of the cosmic microwave background radiation (CMBR). The observations for wavelengths longer than 0.1 cm are well fit by a blackbody spectrum at 2.74 ± 0.02 K; however, including the new data of Matsumoto et al. (1987) the result is no longer consistent with a Planckian spectrum. The data are described by a Thomson-distortion parameter u = 0.021 ± 0.002 and temperature 2.823 ± 0.010 K at the 68% confidence level. Fitting the low-frequency data to a Bose-Einstein spectral distortion yields a 95% confidence level upper limit of 1.4 x 10−2 on the chemical potential [mu]0. These limits on spectral distortions place restrictions on a number of potentially interesting sources of energy release to the CMBR, including the hot intergalactic medium proposed as the source of the X-ray background.

Book Measurements of the Cosmic Microwave Background Temperature at 1 47 GHz

Download or read book Measurements of the Cosmic Microwave Background Temperature at 1 47 GHz written by Marc John Bensadoun and published by . This book was released on 1991 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Cosmological Background Radiation

Download or read book The Cosmological Background Radiation written by Marc Lachièze-Rey and published by Cambridge University Press. This book was released on 1999-06-10 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern cosmology, packaged for use on physics courses.

Book The Temperature of the Cosmic Background Radiation

Download or read book The Temperature of the Cosmic Background Radiation written by and published by . This book was released on 1989 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have measured the temperature of the cosmic background radiation (CBR) at a frequency of 3.8 GHz (7.9 cm wavelength), during two consecutive summers, obtaining a brightness temperature, T{sub CBR}, of 2.56 ± 0.08 K in 1987 and 2.71 ± 0.07 K in 1988 (68% confidence level). The new results are in agreement with our previous measurement at 3.7 GHz obtained in 1986, and have smaller error bars. Combining measurements from all three years we obtain T{sub CBR} = 2.64 ± 0.07 K.