New Extreme Synchrotron BL Lac Objects

Details New Extreme Synchrotron BL Lac Objects New Extreme Synchrotron BL Lac Objects

2000-01-24

arxiv.org/abs/astro-ph/0001410v2

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of the conference "X-Ray Astronomy '99", Bologna, Italy, September 1999; 4 pages, 3 figures, uses

Scientific paper

10.1063/1.1434692

We report on the BeppoSAX observations of four "extreme" BL Lacs, selected to have high synchrotron peak frequencies. All have been detected also in the PDS band. For 1ES 0120+340, PKS 0548-322 and H 2356-309 the spectrum is well fitted by a convex broken power-law, thus locating the synchrotron peak around 1 - 4 keV. 1ES 1426+428 presents a flat energy spectral index (alpha_x= 0.92) up to 100 keV, thus constraining the synchrotron peak to lie near or above that value. For their extreme properties, all sources could be strong TeV emitters.

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