scholarly journals Submillimeter Spectrum of the Cosmic Background Radiation

1989 ◽  
Vol 8 ◽  
pp. 689-691
Author(s):  
Toshio Matsumoto
Keyword(s):  
Background Radiation ◽  
Cosmic Background Radiation ◽  
University Of California ◽  
Sounding Rocket ◽  
Spectral Distortion ◽  
Cosmic Background

Recent observations of the spectrum of the 3K cosmic background radiation (CBR) indicate that the CBR spectrum is consistent with a blackbody spectrum of T = 2.74 ±0.02K (Smoot et al. 1987). These measurements, however, were carried out in the Rayleigh-Jeans part of the spectrum, while theories predict spectral distortion in the Wien part. Therefore, we tried to observe the submillimeter spectrum of the CBR with a liq.He cooled radiometer onboard a sounding rocket. The experiment was a collaboration between Nagoya University and University of California, Berkeley.

PRIMORDIAL MAGNETIC FIELD AND SPECTRAL DISTORTION OF COSMIC BACKGROUND RADIATION

1998 ◽  
Vol 07 (03) ◽  
pp. 489-498 ◽  
Author(s):  
DENIS PUY ◽  
PATRICK PETER
Keyword(s):  
Magnetic Field ◽  
Background Radiation ◽  
Cosmic Background Radiation ◽  
Spectral Distortion ◽  
Free Electrons ◽  
Cosmic Background ◽  
Cyclotron Radiation ◽  
Primordial Plasma ◽  
Primordial Magnetic Field ◽  
Recombination Epoch

The role played by a primordial magnetic field during the pre-recombination epoch is analysed through the cyclotron radiation (due to the free electrons) it might produce in the primordial plasma. We discuss the constraint implied by the measurement or lack thereof COBE on this primordial field.

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 Background Radiation Anisotropies in the Far Infrared

1990 ◽  
Vol 139 ◽  
pp. 400-401
Author(s):  
P. de Bernardis ◽  
M. De Petris ◽  
M. Epifani ◽  
M. Gervasi ◽  
G. Guarini ◽  
...  
Keyword(s):  
Background Radiation ◽  
Order Approximation ◽  
Far Infrared ◽  
Constant Term ◽  
Cosmic Background Radiation ◽  
Spectral Distortion ◽  
The Earth ◽  
Cosmic Background ◽  
Image Position ◽  
Quadrupole Term

The motion of the earth with respect to the distant matter frame produces a spectral distortion in the observed background radiation given by 1The second-order approximation in β gives (de Bernardis et al., 1989) 2 where α≅(dlnI/dln v) = (v/I)(dI/dv). The first term in cosθ of equation (2) is the usual dipole anisotropy, the second constant term is the equivalent of the transverse Doppler effect in special relativity, and the third term is the quadrupole anisotropy. It is interesting to note that the quadrupole term is zero in the Rayleigh-Jeans region of the blackbody spectrum: Q ≈ 1/2(3–α)(2–α)β2cos2θ.

scholarly journals Introductory Remarks

2001 ◽  
Vol 204 ◽  
pp. 5-15
Author(s):  
P. J. E. Peebles
Keyword(s):  
Star Formation ◽  
Background Radiation ◽  
Cosmic Background Radiation ◽  
Morphological Type ◽  
Star Formation History ◽  
Cosmic Background ◽  
Formation History ◽  
Infrared Background

I review the assumptions and observations that motivate the concept of the extragalactic cosmic background radiation, and the issues of energy accounts and star formation history as a function of galaxy morphological type that figure in the interpretation of the measurements of the extragalactic infrared background.

South Pole studies of the anisotropy of the cosmic background radiation at one degree

1990 ◽  
Author(s):  
Peter R. Meinhold ◽  
Philip M. Lubin ◽  
Alfredo O. Chingcuanco ◽  
Jeff A. Schuster ◽  
Michael Seiffert
Keyword(s):  
Background Radiation ◽  
Cosmic Background Radiation ◽  
South Pole ◽  
Cosmic Background
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