scholarly journals Observation and Interpretation of the Cosmic Microwave Background Spectrum

1992 ◽  
Vol 9 ◽  
pp. 275-279 ◽  
Author(s):  
J. C. Mather
Keyword(s):  
Cosmic Microwave Background ◽  
Background Radiation ◽  
Far Infrared ◽  
Cosmic Background Radiation ◽  
Microwave Measurements ◽  
Microwave Background ◽  
Background Spectrum ◽  
Cosmic Background

AbstractRecent precise observations of the microwave and submillimeter cosmic background radiation are summarized, including rocket experiments, the FIRAS (Far InfraRed Absolute Spectrophotometer) on the COBE, CN results, and microwave measurements. Theoretical implications are summarized.

scholarly journals New Limits to the Small Scale Fluctuations in the Cosmic Background Radiation

1983 ◽  
Vol 104 ◽  
pp. 125-126
Author(s):  
K. I. Kellermann ◽  
E. B. Fomalont ◽  
J. V. Wall
Keyword(s):  
Cosmic Microwave Background ◽  
Radio Source ◽  
Flux Density ◽  
Background Radiation ◽  
Cosmic Background Radiation ◽  
Small Region ◽  
Small Scale ◽  
Microwave Background ◽  
Cosmic Background ◽  
Microwave Background Radiation

The VLA has been used at 4.9 GHz to observe a small region of sky in order to extend the radio source count to low flux density (Fomalont et al., these proceedings) and to look for small scale fluctuations in the 2.7 K cosmic microwave background radiation.

scholarly journals Revisiting cosmic microwave background radiation using blackbody radiation inversion

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Koustav Konar ◽  
Kingshuk Bose ◽  
R. K. Paul
Keyword(s):  
Temperature Distribution ◽  
Cosmic Microwave Background ◽  
Background Radiation ◽  
Big Bang ◽  
Blackbody Radiation ◽  
Microwave Background ◽  
Background Spectrum ◽  
Microwave Background Radiation ◽  
Mathematical Process

AbstractBlackbody radiation inversion is a mathematical process for the determination of probability distribution of temperature from measured radiated power spectrum. In this paper a simple and stable blackbody radiation inversion is achieved by using an analytical function with three determinable parameters for temperature distribution. This inversion technique is used to invert the blackbody radiation field of the cosmic microwave background, the remnant radiation of the hot big bang, to infer the temperature distribution of the generating medium. The salient features of this distribution are investigated and analysis of this distribution predicts the presence of distortion in the cosmic microwave background spectrum.

Cosmic Background Radiation Anisotropies in the Far Infrared

1990 ◽  
pp. 400-401
Author(s):  
P. de Bernardis ◽  
M. De Petris ◽  
M. Epifani ◽  
M. Gervasi ◽  
G. Guarini ◽  
...  
Keyword(s):  
Background Radiation ◽  
Far Infrared ◽  
Cosmic Background Radiation ◽  
Cosmic Background

scholarly journals The Angular Distribution of the Cosmic Background Radiation

1986 ◽  
Vol 7 ◽  
pp. 307-319
Author(s):  
R. B. Partridge
Keyword(s):  
Angular Distribution ◽  
Early Universe ◽  
Background Radiation ◽  
Cosmic Background Radiation ◽  
Current Status ◽  
Microwave Background ◽  
Cosmic Background ◽  
Dipole Component ◽  
Upper Limits ◽  
Microwave Background Radiation

AbstractCrucial cosmological information is provided by the observed angular distribution (isotropy) of the cosmic microwave background radiation. This report treats the current status of searches for anisotroples in this radiation on all angular scales from 180° (the dipole component) to 6″. With the exception of the dipole component, only upper limits (at ~ 10-4 in ΔT/T) are available, yet these upper limits have played an important role in refining models of the early Universe and of the origin of structure within it.

A preliminary measurement of the cosmic microwave background spectrum by the Cosmic Background Explorer (COBE) satellite

1990 ◽  
Vol 354 ◽  
pp. L37 ◽  
Author(s):  
J. C. Mather ◽  
E. S. Cheng ◽  
R. E., Jr. Eplee ◽  
R. B. Isaacman ◽  
S. S. Meyer ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Microwave Background ◽  
Background Spectrum ◽  
Preliminary Measurement ◽  
Cosmic Background

An Attempt to Measure the Far Infrared Spectrum of the Cosmic Background Radiation

1974 ◽  
Vol 52 (6) ◽  
pp. 554-561 ◽  
Author(s):  
H. P. Gush
Keyword(s):  
Infrared Spectrum ◽  
Liquid Helium ◽  
Background Radiation ◽  
Far Infrared ◽  
Cosmic Background Radiation ◽  
Black Brant ◽  
The Earth ◽  
Cosmic Background

A liquid helium cooled two-beam far infrared interferometer has been successfully flown in a Black Brant III B rocket. The detector was a germanium bolometer cooled to a temperature of 0.37 K by a liquid He3 refrigerator. The sensitive range was between approximately 5 and 50 cm−1. Satisfactory cosmic spectra were not obtained because of contamination by radiation from the earth.

scholarly journals Infrared Dust Emission in Galaxies and Spectral Distortion of Microwave Background

1990 ◽  
Vol 139 ◽  
pp. 394-395
Author(s):  
V. K. Khersonskii ◽  
N. V. Voshchinnikov
Keyword(s):  
Background Radiation ◽  
Dust Emission ◽  
Cosmic Background Radiation ◽  
Blackbody Radiation ◽  
Spectral Distortion ◽  
Microwave Background ◽  
Cosmic Background ◽  
Submillimeter Wavelengths

Recent observations (Matsumoto et al., 1988) indicate that at submillimeter wavelengths the spectrum of the cosmic background radiation (CBR) deviates from that of Planckian blackbody with a temperature T0R = 2.76 K. The relative excess of the flux ζ(v) = [F(v) – F0(v)] / F0(v) (where F(v) and F0(v) are the registered flux and the flux of the blackbody radiation at the frequency of the observations) are 0.6 at a frequency v1 = 380 GHz (λ = 709 μm) and 3.4 at a frequency v2 = 624 GHz (λ = 481 μm).

scholarly journals Cosmic Microwave Background Spectrum Measurements

1986 ◽  
Vol 7 ◽  
pp. 297-305
Author(s):  
George F. Smoot
Keyword(s):  
Cosmic Microwave Background ◽  
Wavelength Range ◽  
Background Radiation ◽  
Cosmic Microwave Background Radiation ◽  
General Assembly ◽  
Microwave Background ◽  
Background Spectrum ◽  
Spectrum Measurement ◽  
Spectrum Measurements ◽  
Microwave Background Radiation

AbstractThis paper reviews the three major cosmic microwave background radiation (CMBR) spectrum measurement programs conducted and published since the last (XVII) IAU General Assembly. The results are consistent with a Planckian spectrum with temperature 2.72 ± 0.03 K spanning a wavelength range of 0.1 to 12 cm. Limits on possible distortions and implications are outlined. Ongoing and future measurements are discussed.

scholarly journals On the Large-Scale Anisotropy of the Cosmic Background Radiation in the Far Infrared

1983 ◽  
Vol 104 ◽  
pp. 139-141
Author(s):  
P. Boynton ◽  
C. Ceccarelli ◽  
P. de Bernardis ◽  
S. Masi ◽  
B. Melchiorri ◽  
...  
Keyword(s):  
Large Scale ◽  
Background Radiation ◽  
Far Infrared ◽  
Cosmic Background Radiation ◽  
Infrared Observations ◽  
Preliminary Results ◽  
Wavelength Channel ◽  
Cosmic Background

We report preliminary results relative to a balloon-borne search for the large-scale anisotropy carried out in 1980 by means of two far infrared photometers centered at 400 and 1100 microns. While these results are consistent with those obtained in an earlier flight, the second, shorter wavelength channel included in the 1980 work provides interesting insights into the influence of galactic dust on such far infrared observations.

A NEW VIEW ON THE PROBLEM OF ANISOTROPY OF THE COSMIC BACKGROUND RADIATION

1993 ◽  
Vol 02 (01) ◽  
pp. 97-104 ◽  
Author(s):  
V.G. GURZADYAN ◽  
A.A. KOCHARYAN
Keyword(s):  
Negative Curvature ◽  
Background Radiation ◽  
Cosmological Parameters ◽  
Cosmic Background Radiation ◽  
Geometrical Shape ◽  
Microwave Background ◽  
Cosmic Background ◽  
Microwave Background Radiation ◽  
History Of ◽  
The Universe

The anisotropy properties of the Cosmic Microwave Background Radiation (CMB) are considered within the framework of the photon beam mixing effect developed earlier. The existence of an observable characteristic of the CMB is shown, namely the geometrical shape of anisotropy spots and their degree of complexity, which can contain unique information on cosmological parameters and the life history of the Universe. If future experiments (COBE and others) indicate such features of anisotropy maps, then one can have serious evidence for the negative curvature of the Universe.

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