Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011japa...32..113d&link_type=abstract
Journal of Astrophysics and Astronomy, Volume 32, Issue 1-2, pp. 113-115
Astronomy and Astrophysics
Astrophysics
Galaxies: Active, Bl Lacertae Objects, General, Gamma Rays, Observations.
Scientific paper
The multi-band data covering optical, X-ray and γ-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- γ-ray continua, α γX γ >0 and α XOX < 0, while FSRQs and LBLs have α γX γ < 0. The α XOX distribution of FSRQs and LBLs extends from negative to positive values. We suggest α γX γ > 0 and α XOX < 0 could be considered as a criterion for HBLs. Moreover, HBLs have narrow distribution of peak interval of logν_p^ic-logν_p^syn, and FSRQs have significant anti-correlation between logν_p^ic-logν_p^syn and logν_p^syn. 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.
Dai Benzhong
Yan Dahai
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