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: Article in Journal/Newspaper
• Language: English
• Published: Oxford University Press (OUP) 2008
• Subjects: Yakutsk
• Online Access: http://dx.doi.org/10.1111/j.1745-3933.2008.00503.x; https://academic.oup.com/mnrasl/article-pdf/388/1/L79/54682902/mnrasl_388_1_l79.pdf

Abstract 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.