Instruments

Lichti, G.; Georgii, R.

doi:10.1007/978-3-662-04593-0_3

Cited by 2 publications

(3 citation statements)

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“…• , lasts for a few nanoseconds, and peaks in the blue to near-UV [157]. The detection principle of Cherenkov detectors is to collect as much as possible of this radiation with optical mirrors (see g. 1.…”

Section: Detection Of γ-Rays On the Groundmentioning

confidence: 99%

“…1.1.3) and earlier pair-conversion telescopes [157]. The LAT was designed to avoid some of the limitations of EGRET (such as self-veto at high energies because of ACD backsplash, discussed in Chapter 4), and incorporates new technology and advanced on-board programmable electronics that will allow the LAT to achieve its scientic goals.…”

Section: Glast Latmentioning

confidence: 99%

“…Building upon the legacy of pioneer space and ground based experiments like CGRO, WHIPPLE, HEGRA, and others [157], existing and future instruments continue to revamp our understanding of the γ-ray universe.…”

mentioning

confidence: 99%

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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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Section: Detection Of γ-Rays On the Groundmentioning

confidence: 99%

Section: Glast Latmentioning

confidence: 99%