New Limits on the Density of the Extragalactic Background Light from TeV Blazars

Details New Limits on the Density of the Extragalactic Background Light from TeV Blazars New Limits on the Density of the Extragalactic Background Light from TeV Blazars

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..921..240m&link_type=abstract

THE FIRST GLAST SYMPOSIUM. AIP Conference Proceedings, Volume 921, pp. 240-242 (2007).

Other

Background Radiations, Gamma-Ray Sources, Gamma-Ray Bursts, Active And Peculiar Galaxies And Related Systems, Origin, Formation, Evolution, Age, And Star Formation

Scientific paper

The diffuse extragalactic background light (EBL) in the UV to far IR wavelength regime carries important information about the galaxy and star formation history of the universe. However, a direct measurement of the EBL is difficult due to strong foregrounds. On the other hand, observations of the distant sources of TeV photons can provide an indirect measurement of the EBL: The TeV photons are attenuated via pair production and the observed spectra therefore carry an imprint of the EBL. With assumptions about the source spectrum limits on the EBL can be derived. We adopt a scan on a grid in EBL density vs wavelength the EBL density using spline functions, which allows us to test over 8 million different EBL shapes making the scan to be independent from any predefined shape between 0.8 and 80 microns. Here we present upper limits on the EBL density using energy spectra from all detected TeV blazars. Compared to the previous studies, the derived limits are the strongest in the range between 3 and 60 microns so far.

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