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Properties of BL Lac Objects with Redshift ≤ 0.2

Chinese Journal of Astronomy and Astrophysics 2002年第1期2卷 8-16页

作者： ben－zhongdai Guang－ZhongXie 等 YunnanObservatory ChineseAcademyofScienceKunming650011 NationalAstronomicalObservatories ChineseAcademyofScienceBeijing100012

We present a large sample which includes 82 BL Lac objects with red- shifts below 0.2 from recent literature. We find strong correlations in both flux and luminosity between the radio (5 GHz) and optical bands (5500 A). The correlations in other bands are very weak. Five TeV BL Lacs and two suspect sources are found to have similar properties as high- frequency- peaked BL Lacs (HBLs). Our results suggest that both the radio and optical emissions are from the same radiation mech- anism in the SSC model. The TeV BL Lac candidates should be HBLs or HBL-like objects with small redshifts.

关键词： galaxies: active - BL Lacertae objects: general -gamma-ray: observations - radiation mechanisms: non-thermal

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The Doppler Effect and Spectral Energy Distribution of Blazars

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Chinese Journal of Astronomy and Astrophysics 2001年第3期1卷 213-220页

作者： Guang－ZhongXie ben－zhongdai 等 YunnanAstronomicalObservatory ChineseAcademyofScienceKunming650011 NationalAstronomicalObservatories

The relativistic beaming model is adopted to discuss quantitatively the observational differences between radio-selected BL Lac objects (RBLs) and X-ray- selected BL Lac objects (XBLs), and between BL Lac objects and flat spectrum radio quasars (FSRQs). The main results are the following: (1) In the Doppler corrected color-color ( ) diagram, XBLs and FSRQs occupy separated regions, while RBLs bridge the gap between them. These properties suggest that similar intrinsic physical processes operate in all the objects under a range of intrinsic physical conditions. (2) Our results are consistent with the results of Sambruna, Maraschi and Urry (1996) from other methods. We show the ■xox introduced by Sambruna to be a good index for describing the energy distribution because it represents the intrinsic energy distribution and includes the Doppler correction. (3) The Doppler effect of relativistic beaming is the main mechanism, and the physical differences (such as magnetic fields, electron energies) are also important complementary factors for understanding the relation between XBLs and RBLs;

关键词： Blazars: general - quasars:general - radiation mechanism: nonthermal

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Gamma-ray Emission from the γ-ray-loud BL Lac Objects

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Chinese Journal of Astronomy and Astrophysics 2001年第6期1卷 494-500页

作者： Guang-ZhongXie ben-zhongdai En-WeiLiang Zhao-HuaXie YunnanAstronomicalObservatory ChineseAcademyofScienceKunming650011 DepartmentofPhysics UniversityofHongKong

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 Fonuclei forγ-ray-loud BL Lac objects (correlation coefficients: 7γ=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 19γ-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 aγ and aK for 15 BL Lac objects(γ = 0.84,p = 3.11 × 10-4); (2) the correlation between aγ and ao for 12 BL Lac objects isγ = 0.82, p = 1.5 × 10-3; (3) there is no correlation between a7 and ax 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 theγ-ray emission of the BL Lac objects. The electrons emitting JR and optical radiation via synchrotron are also responsible for upscattering these photons toγ-rays, and a variability in IR-optical regime should be accompanied by a change in theγ-rays.

关键词： gamma rays - BL Lacertae objects: general

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