Spectral energy distributions and high-energy emission of BL Lac type objects

• Published in: Monthly Notices of the Royal Astronomical Society: Letters
• Main Author: Troitsky, Sergey
• Format: Text
• Language: English
• Published: Oxford University Press 2008
• Subjects: Letters; Yakutsk
• Online Access: http://mnrasl.oxfordjournals.org/cgi/content/short/388/1/L79; https://doi.org/10.1111/j.1745-3933.2008.00503.x

Based on identifications from the Véron and Quasars.org catalogues, we determine the optical-to-X-ray spectral indices for a sample of 201 BL Lac type objects (BLLs) and search for trends in the distribution of these indices of the sources detected in high-energy bands. We find that EGRET-detected sources are low-energy peaked and that the positional correlation with the arrival directions of ultrahigh-energy cosmic rays from the previously studied Akeno Giant Air-Shower Array, Yakutsk and High-Resolution Fly's Eye samples is dominated by low-energy-peaked BLLs.