Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008acasn..49..273z&link_type=abstract
Acta Astronomica Sinica, vol. 49, no. 3, p. 273-281
Astronomy and Astrophysics
Astronomy
1
Galaxies: Active, Bl Lacerate Objects: General, Gamma Rays: Theory, X-Rays: Galaxies, Methods: Data Analysis
Scientific paper
This paper collects 18 γ-ray-loud BL Lacertae (BL Lac) objects with the observed X-ray and γ-ray flux densities (maximum, minimum, average) as well as the X-ray (1keV) and γ-ray (above 100MeV) average spectral indices.These flux densities and average spectral indices data came from 33 literatures. To analysis the character between X-ray and γ-ray flux densities in the maximum(, ) , minimum (, ) and average(, ) value and those average spectral indices( , ) , we employed the correlation analysis. We studied their correlations in detail, and our results show that:1) there is a strong correlation between and in the high, average and low state.This result affirmed Stickel et al. [53]model which supposed express a few dust around the black hole.2) there is a strong correlations between and in the average state.3) there is not a significant correlation between the average spectral indices and the flux densities in high and average state.4) there is a strong anti-correlation between the average γ-ray spectral indices and the X-ray flux densities in the low state, and also there is a weak correlation between the average X-ray spectral indices and the γ-ray flux densities in the low state.Our results are in agreement with the scenario that the X-ray and γ-ray emission from BL Lac objects are likely produced by the same population of relativistic electrons through synchrotron and synchrotron Self-Compton model (SSC) process, respectively.
Zhang Hai-Juan
Zhang Xinyu
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