Cosmological Constant or Intergalactic Dust? Constraints from the Cosmic Far‐Infrared Background

2000 ◽  
Vol 532 (1) ◽  
pp. 28-36 ◽  
Author(s):  
Anthony Aguirre ◽  
Zoltan Haiman
Keyword(s):  
Cosmological Constant ◽  
Far Infrared ◽  
Infrared Background ◽  
Intergalactic Dust

scholarly journals Measurement and Implications of the Cosmic Microwave Background Spectrum

1996 ◽  
Vol 168 ◽  
pp. 17-29
Author(s):  
John C. Mather
Keyword(s):  
Background Radiation ◽  
Far Infrared ◽  
Big Bang ◽  
Scale Invariant ◽  
Background Spectrum ◽  
Nasa Goddard Space ◽  
Wide Range ◽  
Infrared Background ◽  
Microwave Radiometers ◽  
The Big Bang

The Cosmic Background Explorer (COBE) was developed by NASA Goddard Space Flight Center to measure the diffuse infrared and microwave radiation from the early universe. It also measured emission from nearby sources such as the stars, dust, molecules, atoms, ions, and electrons in the Milky Way, and dust and comets in the Solar System. It was launched 18 November 1989 on a Delta rocket, carrying one microwave instrument and two cryogenically cooled infrared instruments. The Far Infrared Absolute Spectrophotometer (FIRAS) mapped the sky at wavelengths from 0.01 to 1 cm, and compared the CMBR to a precise blackbody. The spectrum of the CMBR differs from a blackbody by less than 0.03%. The Differential Microwave Radiometers (DMR) measured the fluctuations in the CMBR originating in the Big Bang, with a total amplitude of 11 parts per million on a 10° scale. These fluctuations are consistent with scale-invariant primordial fluctuations. The Diffuse Infrared Background Experiment (DIRBE) spanned the wavelength range from 1.2 to 240 μm and mapped the sky at a wide range of solar elongation angles to distinguish foreground sources from a possible extragalactic Cosmic Infrared Background Radiation (CIBR). In this paper we summarize the COBE mission and describe the results from the FIRAS instrument. The results from the DMR and DIRBE were described by Smoot and Hauser at this Symposium.

scholarly journals CROSS-CORRELATION OF NEAR- AND FAR-INFRARED BACKGROUND ANISOTROPIES AS TRACED BYSPITZERANDHERSCHEL

2015 ◽  
Vol 811 (2) ◽  
pp. 125 ◽  
Author(s):  
Cameron Thacker ◽  
Yan Gong ◽  
Asantha Cooray ◽  
Francesco De Bernardis ◽  
Joseph Smidt ◽  
...  
Keyword(s):  
Cross Correlation ◽  
Far Infrared ◽  
Infrared Background

Far Infrared Emission from an Intergalactic Dust Cloud?

1990 ◽  
pp. 385-386
Author(s):  
Bogdan Wszolek ◽  
Konrad Rudnicki ◽  
Sivia Masi ◽  
Paolo de Bernardis
Keyword(s):  
Dust Cloud ◽  
Far Infrared ◽  
Infrared Emission ◽  
Intergalactic Dust

scholarly journals Far Infrared Emission from an Intergalactic Dust Cloud?

1990 ◽  
Vol 139 ◽  
pp. 385-386
Author(s):  
Bogdan Wszolek ◽  
Konrad Rudnicki ◽  
Sivia Masi ◽  
Paolo de Bernardis
Keyword(s):  
Dust Cloud ◽  
Far Infrared ◽  
Infrared Emission ◽  
Intergalactic Dust

The possible presence of general extragalactic extinction has been studied by many authors. Extragalactic dust can be associated with a pregalactic star population and/or it can be ejected by galaxies during their evolution.

scholarly journals Early Results From the Cosmic Background Explorer (COBE)

1990 ◽  
Vol 123 ◽  
pp. 9-18
Author(s):  
J. C. Mather ◽  
M. G. Hauser ◽  
C. L. Bennett ◽  
N. W. Boggess ◽  
E. S. Cheng ◽  
...  
Keyword(s):  
Chemical Potential ◽  
Zero Point ◽  
Far Infrared ◽  
Strong Limit ◽  
Cosmic Background ◽  
Early Results ◽  
Local Sources ◽  
Infrared Background ◽  
Reduction Methods ◽  
Microwave Radiometers

AbstractThe Cosmic Background Explorer, launched November 18, 1989, has nearly completed its first full mapping of the sky with all three of its instruments: a Far Infrared Absolute Spectrophotometer (FIRAS) covering 0.1 to 10 mm, a set of Differential Microwave Radiometers (DMR) operating at 3.3, 5.7, and 9.6 mm, and a Diffuse Infrared Background Experiment (DIRBE) spanning 1 to 300 µm in ten bands. A preliminary map of the sky derived from DIRBE data is presented. Initial cosmological implications include: a limit on the Comptonization y parameter of 10−3, on the chemical potential μ parameter of 10−2, a strong limit on the existence of a hot smooth intergalactic medium, and a confirmation that the dipole anisotropy has the spectrum expected from a Doppler shift of a blackbody. There are no significant anisotropies in the microwave sky detected, other than from our own galaxy and a cosθ dipole anisotropy whose amplitude and direction agree with previous data. At shorter wavelengths, the sky spectrum and anisotropies are dominated by emission from ‘local’ sources of emission within our Galaxy and Solar System. Preliminary comparison of IRAS and DIRBE sky brightnesses toward the ecliptic poles shows the IRAS values to be significantly higher than found by DIRBE at 100 μm. We suggest the presence of gain and zero-point errors in the IRAS total brightness data. The spacecraft, instrument designs, and data reduction methods are described.

scholarly journals The Contribution of Quasars to the Far-Infrared Background

2002 ◽  
Vol 566 (2) ◽  
pp. L67-L70 ◽  
Author(s):  
G. Risaliti ◽  
M. Elvis ◽  
R. Gilli
Keyword(s):  
Far Infrared ◽  
Infrared Background

scholarly journals Constraints on Far-Infrared Source Counts in the Lockman Hole using a Power Spectrum Analysis

2001 ◽  
Vol 204 ◽  
pp. 301-301
Author(s):  
H. Matsuhara ◽  
K. Kawara ◽  
Y. Sofue ◽  
Y. Taniguchi ◽  
Y. Sato ◽  
...  
Keyword(s):  
Background Radiation ◽  
Power Spectra ◽  
Far Infrared ◽  
Infrared Space Observatory ◽  
Infrared Source ◽  
Star Forming ◽  
The Galaxy ◽  
Galaxy Count ◽  
Infrared Background ◽  
Lockman Hole

We present the characteristics of far-infrared (FIR) brightness fluctuations at 90 μm and 170 μm in the Lockman Hole, which were surveyed with the ISOPHOT instrument aboard the Infrared Space Observatory (ISO), and give constraints on the galaxy number counts down to 30 mJy at 90 μm and 50 mJy at 170 μm. The fluctuation power spectra of the FIR images are not dominated by IR cirrus, and are instead most likely due to star-forming galaxies. This analysis indicates the existence of strong evolution in the counts. Especially at 90 μm, the source density is much larger than that expected from the currently available galaxy count models. The galaxies responsible for the fluctuations also significantly contribute to the cosmic infrared background radiation recently derived from an analysis of the COBE data.

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