An upper limit to the infrared background from observations of TeV gamma rays

Biller, S. D.; Akerlof, C.; Buckley, J.; Cawley, M. F.; Chantell, M.; Fegan, D. J.; Fennell, S.; Gaidos, J. A.; Hillas, A. M.; Kerrick, A. D.; Lamb, R. C.; Lewis, D. A.; Meyer, D. I.; Mohanty, G.; O’Flaherty, K. S.; Punch, M.; Reynolds, P. T.; Rose, H. J.; Rovero, A. C.; Schubnell, M.; Sembroski, G. H.; Weekes, T. C.; Wilson, C.

doi:10.1086/175689

Cited by 35 publications

(29 citation statements)

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“…Background limits derived from their analyses are shown in Figure 4. The problems of ascertaining reliable evidence for intergalactic attenuation were illustrated by Biller et al (1995), who showed two equally acceptable fits to the spectrum of Mrk 421, the first requiring no attenuation, the second requiring significant CIB attenuation. Taking into account the uncertainties in the extrapolation of the source spectrum from GeV to TeV energies and in the spectral shape of the CIB, Biller et al (1995) derived a very conservative upper limit of ∼250 h nW m −2 sr −1 for the CIB at 10 µm.…”

Section: Cib Limits From Tev γ-Ray Observationsmentioning

confidence: 99%

“…The problems of ascertaining reliable evidence for intergalactic attenuation were illustrated by Biller et al (1995), who showed two equally acceptable fits to the spectrum of Mrk 421, the first requiring no attenuation, the second requiring significant CIB attenuation. Taking into account the uncertainties in the extrapolation of the source spectrum from GeV to TeV energies and in the spectral shape of the CIB, Biller et al (1995) derived a very conservative upper limit of ∼250 h nW m −2 sr −1 for the CIB at 10 µm. Stanev & Franceschini (1998) were the first to apply the attenuation analysis to Mrk 501, using high quality TeV γ-ray data obtained by the HEGRA experiment between March and October 1997 when the source was unusually bright.…”

Section: Cib Limits From Tev γ-Ray Observationsmentioning

confidence: 99%

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The Cosmic Infrared Background: Measurements and Implications

Hauser

Dwek

2001

Annu. Rev. Astron. Astrophys.

806

817

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ABSTRACT:The cosmic infrared background records much of the radiant energy released by processes of structure formation that have occurred since the decoupling of matter and radiation following the Big Bang. In the past few years, data from the Cosmic Background Explorer (COBE) mission provided the first measurements of this background, with additional constraints coming from studies of the attenuation of TeV γ-rays. At the same time there has been rapid progress in resolving a significant fraction of this background with the deep galaxy counts at infrared wavelengths from the Infrared Space Observatory (ISO) instruments and at submillimeter wavelengths from the Submillimeter Common User Bolometer Array (SCUBA) instrument. This article reviews the measurements of the infrared background and sources contributing to it, and discusses the implications for past and present cosmic processes.

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Section: Cib Limits From Tev γ-Ray Observationsmentioning

confidence: 99%

Section: Cib Limits From Tev γ-Ray Observationsmentioning

confidence: 99%

The Cosmic Infrared Background: Measurements and Implications

Hauser

Dwek

2001

Annu. Rev. Astron. Astrophys.

806

817

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“…A spectral EBL shape is then assumed with only the absolute normalization left as a free parameter. The EBL intensity is then estimated by tting the model to the observed γ-ray ux [23,54,72,101,257,256]. …”

Section: Using Gamma-ray Sources To Measure the Ebl Densitymentioning

confidence: 99%

Detecting the EBL Attenuation of Blazars with GLAST

Reyes¹

2007

AIP Conference Proceedings

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The Large Area Telescope (LAT) on board GLAST (Gamma-ray Large Area Space Telescope) due for launch in late 2007 will study the gamma-ray sky in the energy range 20 MeV to >300 GeV. GLAST-LAT's improved sensitivity with respect to previous missions will increase the number of known gamma-ray blazars from about 100 to thousands, with redshifts up to z∼3-5. Since γ-rays with energy above 10 GeV interact via pair-production with photons from the Extragalactic Background Light (EBL), the systematic attenuation of GLAST-detected blazars as a function of redshift would constitute and eective and unique probe of the optical-UV EBL density and its evolution over cosmic history.Analysis techniques introduced in this dissertation make use of the large number of blazars detected by GLAST to study the collective behavior of their spectra as a function of redshift. These techniques are shown to oer powerful ways to help separate the common level of attenuation due to the EBL from the intrinsic peculiarities of individual blazars.The capability of GLAST to perform these measurements depends in great measure on the acceptance of the instrument to high energy γ-rays (E > 10 GeV), which in previous space-experiments has been drastically reduced due to backsplash self-veto.This dissertation includes a study of the backsplash eect as measured with ightlike detectors during a beam test of the LAT calibration unit. This analysis was used to verify the capabilities of the GLAST simulations tools to reproduce backsplash eects.

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“…(1998) model leads to residuals of about 4.7 x 10-7 Wm-2sr-1 at these wavelengths. On the other hand, upper limits on the CIRB have been established in this wavelength range using TeV gamma rays from extragalactic sources at the level of 10-8 Wm-2sr-1 (e.g., Biller et al 1995). This is not in contradiction with the estimate of uncertainties in the Kelsall et al zodiacal model by Hauser et al (1998), who give only upper limits for the CIRB.…”

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confidence: 96%

Far-Infrared Source Counts and the Diffuse Infrared Background

Puget

Lagache

2001

Symp. - Int. Astron. Union

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Abstract. The cosmic far-infrared background is now well measured from 140 J-Lm to 1 mm. Uncertainties remain at 100 J-Lm (and even more at 60 J-Lm). These are dominated by limitations of the zodiacal model. The nature of sources dominating the background near its maximum are beginning to be studied through deep surveys carried out with ISOPHOT. These surveys show very steep number counts and fluctuations of the background due to unresolved sources.

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An upper limit to the infrared background from observations of TeV gamma rays

Cited by 35 publications

References 0 publications

The Cosmic Infrared Background: Measurements and Implications

The Cosmic Infrared Background: Measurements and Implications

Detecting the EBL Attenuation of Blazars with GLAST

Far-Infrared Source Counts and the Diffuse Infrared Background

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