The SED of the TeV BLLac 1ES 1426+428 after correction for the TeV--IR absorption

Abstract

The recent HEGRA detection and spectrum of 1ES 1426+428 at TeV energies, once corrected for absorption using present estimates of the diffuse extragalactic IR background, suggest that the high energy peak of the Spectral Energy Distribution (SED) could be much higher than the synchrotron one ($L_c/L_s>10$), and lie at energies above 8-10 TeV. To see if such an SED could be accounted for, we have applied a "finite injection time" SSC model, and present here some preliminary results. Within this model, we found the need of an external ("ambient") contribution to the energy density of seed photons, in order to account for both the high Compton dominance and the hard spectrum.

arXiv comment4 pages, 5 figures, to appear in the proceedings of the conference "Relativistic jets in the Chandra and XMM era", Bologna, 23-27/9/02 (New Astr. Rev.)

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• Extreme synchrotron BL Lac objects
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• Strong New Constraints on the Extragalactic Background Light in the Near- to Mid-IR
• Detection of Intra-day Variability Timescales of Four High Energy Peaked Blazars with XMM-Newton
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• BL Lac Contribution to the Extragalactic Gamma-Ray Background
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• Multicolour Optical Variability Monitoring of Blazars with High Time Resolution
• Jetted Active Galactic Nuclei
• Potential of the next generation VHE instruments to probe the EBL (I): the low- and mid-VHE
• Constraining the Emission Properties of TeV Blazar H1426+428 by the Synchrotron-Self-Compton Model