Gamma-Ray and Near-Infrared Emission from Gamma-Ray-loud Blazars

Details Gamma-Ray and Near-Infrared Emission from Gamma-Ray-loud Blazars Gamma-Ray and Near-Infrared Emission from Gamma-Ray-loud Blazars

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...508..180x&link_type=abstract

The Astrophysical Journal, Volume 508, Issue 1, pp. 180-185.

Astronomy and Astrophysics

Astronomy

19

Galaxies: Bl Lacertae Objects: General, Gamma Rays: Observations, Radiation Mechanisms: Nonthermal

Scientific paper

We have collected 26 gamma-ray-loud blazars (15 BL Lac objects and 11 flat-spectrum radio quasars) with both observed near-IR and gamma-ray flux densities, with the following main results: (1) there is a very strong correlation between F_gamma and F_IR in the low state, and a weaker but also significant correlation between F_gamma and F_IR in the high state for 20 objects with both ``high'' and ``low'' state fluxes; (2) there is a very significant correlation between F_gamma and F_IR in the low state, and a weak correlation between F_gamma and F_IR in the high state for 26 sources; (3) there is a weak correlation between F_gamma and F_X, but not between F_gamma and F_O, and F_R for both the low and high state of 26 sources; (4) there is a strong correlation between F_gamma and F_IR in the low and high state for 15 BL Lac objects, but not for 11 flat-spectrum radio quasars. Possible constraints on the gamma-ray emission mechanism are discussed. We suggest that the main gamma-ray radiation mechanism is probably the synchrotron self-Compton process. The inverse Compton scattering of the radiation from hot circumnuclear dust with T_g = 2000 K, which is located within the region of r ~ 3 pc, by beamed ultrarelativistic electrons is likely to be an important complementary mechanism. In addition, the gamma-ray emission may be somewhat different for BL Lac objects and flat-spectrum radio quasars.

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