Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001chjaa...1..494x&link_type=abstract
Chinese Journal of Astronomy & Astrophysics, Vol. 1, pp. 494-500
Astronomy and Astrophysics
Astrophysics
3
&Gamma, Rays, Bl Lacertae Objects: General
Scientific paper
Using the HST observation data of BL Lac objects by Urry et al. and γ-ray observation data, we find that there is a correlation between Fγ and Fnuclei for γ-ray-loud BL Lac objects (correlation coefficients: γ=0.63, p=4.0 × 10-2), but no correlation between Fγ and FOhost, where FOnuclei and FOhost are the fluxes of nuclei and host galaxy in V-band. For 19 γ-ray-loud BL Lac objects with observed spectral index in multi-wavebands, the spectral index correlations between any two bands are as follow: (1) there is a strong correlation between αγ and αK for 15 BL Lac objects(γ=0.84, p=3.11 × 10-4); (2) the correlation between αγ and αO for 12 BL Lac objects is γ=0.82,p=1.5×10-3 (3) there is no correlation between αγ and αX for 16 BL Lac objects. The results, together with characteristic double-humped shape of their SEDs, show that the synchrotron self-Compton mechanism might be a main mechanism for the γ-ray emission of the BL Lac objects. The electrons emitting IR and optical radiation via synchrotron are also responsible for upscattering these photons to γ-rays, and a variability in IR-optical regime should be accompanied by a change in the γ-rays.
Dai Ben-Zhong
Liang E.-W.
Xie Guang-Zhong
Xie Zhao-Hua
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