The broad band X-ray spectra of intermediate BL Lac objects
Abstract
We present recent X-ray observations of intermediate BL Lac objects (IBLs), i.e. BL Lacs which are located between high-energy and low-energy peaked BL Lac objects with respect to alpha_rx. We briefly discuss the statistical properties of IBLs from the RGB sample and then focus on a detailed broad band spectral analysis of two objects, namely 1424+2401 and 1055+5644, which were observed with ASCA and SAX, respectively. In both cases the spectra are steep and we find significant curvature in 1424+2401 in the sense that the spectrum gets flatter at both low (< 1 keV) and high energies (> 5 keV). Our results are in line with the hypothesis of a continuous distribution of synchrotron peak frequencies among BL Lac objects.
Cite
@article{arxiv.astro-ph/9808231,
title = {The broad band X-ray spectra of intermediate BL Lac objects},
author = {J. Siebert and W. Brinkmann and S. A. Laurent-Muehleisen and M. Matsuoka},
journal= {arXiv preprint arXiv:astro-ph/9808231},
year = {2007}
}
Comments
4 pages, incl. 6 figures, to appear in the proceedings of the 32nd COSPAR Scientific Assembly, Section E1.1, Nagoya, Japan, July 13-15 1998, Adv. in Space Research