Constraining the Cosmic Background Light with four BL Lac TeV spectra
arXiv:astro-ph/0308025 · doi:10.1016/j.newar.2003.12.003
Abstract
The intrinsic BL Lac spectra above few hundreds GeV can be very different from the observed ones due to the absorption effects by the diffuse Extragalactic Background Light (EBL), at present poorly known. With the recent results, there are now 4 sources with good spectral information: Mkn 421 (z=0.031), Mkn 501 (z=0.034), 1ES 1426+428 (z=0.129) and 1ES 1959+650 (z=0.047). Making simple assumptions on the shape of the intrinsic spectra (according to the present blazar knowledge), we have considered the effects of different EBL spectral energy distributions (SED) for the first time on all 4 objects together, deriving constraints for the EBL fluxes. These resulted significantly lower than many direct estimates.
arXiv comment4 pages, 8 figures; to appear in the proceedings of the 2nd Veritas Symposium: "TeV Astrophysics of extragalactic sources". April 2003, Chicago
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- Fermi Large Area Telescope Constraints on the Gamma-ray Opacity of the Universe
- Multi-wavelength observations of PKS 2155-304 with H.E.S.S
- The hard TeV spectrum of 1ES 0229+200: new clues from Swift
- Gamma-rays from Blazars and the Extragalactic Background Light
- Fermi Observations of the Very Hard Gamma-ray Blazar PG 1553+113
- Spectrum of Very High Energy Gamma-Rays from the blazar 1ES1959+650 during Flaring Activity in 2002
- Kiloparsec-Scale Jets in FR I Radio Galaxies and the Gamma-Ray Background
- Is There an Imprint of Primordial Stars in the Tev Gamma-Ray Spectrum of Blazars?
- A low density of the Extragalactic Background Light revealed by the H.E.S.S. spectra of the BLLac objects 1ES 1101-232 and H 2356-309
- Gamma-ray constraints on the infrared background excess
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- The First VHE Activity of OJ 287 and the Extragalactic Background Light