Multi-Band Spectral Properties of Fermi Blazars

作者：Dai Benzhong^*; Yan Dahai

来源：Journal of Astrophysics and Astronomy, 2011, 32(1-2): 113-115.

• Galaxies: active
• BL Lacertae objects
• general
• gamma rays
• observations

The multi-band data covering optical, X-ray and.-ray energy regions of 130 Fermi blazars in the First LAT AGN Catalog (1LAC) were collected to investigate the broadband spectral properties. The composite spectral indices show that HBLs have convex optical-to-X-ray continua and concave X-ray-to-gamma-ray continua, alpha(gamma X gamma) > 0 and alpha(XOX) < 0, while FSRQs and LBLs have alpha(gamma X gamma) < 0. The alpha(XOX) distribution of FSRQs and LBLs extends from negative to positive values. We suggest alpha(gamma X gamma) > 0 and alpha(XOX) < 0 could be considered as a criterion for HBLs. Moreover, HBLs have narrow distribution of peak interval of log nu(ic)(p) - log nu(syn)(p), and FSRQs have significant anti-correlation between log nu(ic)(p) - log nu(syn)(p) and log nu(syn)(p). This indicates that SSC model is responsible for high energy emission of HBLs, while EC for FSRQs. Our results also indicate that FSRQs with larger break energy of electrons have smaller bulk Lorentz factor of dissipation region.

• 出版日期2011-6
• 单位云南大学