arXiv 0905.08992009-05astro-ph.COastro-ph.HE

The hard TeV spectrum of 1ES 0229+200: new clues from Swift

F. Tavecchio, G. Ghisellini, G. Ghirlanda, L. Costamante, A. Franceschini

备注：: 5 pages, 1 figure. Accepted for publication as a letter to MNRAS after minor revision
DOI：: 10.1111/j.1745-3933.2009.00724.x

英文摘要：

The BL Lac object 1ES 0229+200 (z=0.14) has been detected by HESS during observations taking place in 2005-2006. The TeV spectrum, when corrected for the absorption of gamma-ray photons through the interaction with the extragalactic background light, is extremely hard, even if the most conservative level for the background is considered. The case of 1ES 0229+200 is very similar to that of 1ES 1101-232, for which a possible explanation, in the framework of the standard one-zone synchrotron-self Compton model, is that the high-energy emission is synchrotron-self Compton radiation of electrons distributed as a power law with a large value of the minimum energy. In this scenario the hard TeV spectrum is accompanied by a very hard synchrotron continuum below the soft X-ray band. We will show that recent Swift observations of 1ES 0229+200 in the critical UV-X-ray band strongly support this model, showing the presence of the expected spectral break and hard continuum between the UV and the X-ray bands.

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