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11 Result(s)

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  1. No Access

    Article

    The broad band spectral index of blazars in a low state

    Using the broad band spectral index of 164 blazars in a low state, we studied the possible correlation between different broad band spectral index (α r.ir ...

    Y. G. Zheng, X. Zhang, S. M. Hu in Astrophysics and Space Science (2007)

  2. No Access

    Article

    Variability and spectral variation of 3C 66A

    3C 66A was monitored by the BATC (Bei**g-Arizona-Taipei-Connecticut) telescope from 2005 to 2008, 1994 observations were obtained on 89 nights. Detailed research and analysis was performed on these observatio...

    Shao Ming Hu, Jianghua Wu, H. Y. Guo, X. Zhou, X. Zhang… in Astrophysics and Space Science (2011)

  3. No Access

    Article

    Multi-Wavelength Variability in PKS 2155-304

    We study multi-wavelength variability in BL Lacertae object PKS 2155-304 in the frame of the time dependent one-zone synchrotron self-Compton (SSC) model, where stochastic particle acceleration is taken into a...

    Y. G. Zheng, L. Zhang, X. Zhang, H. J. Ma in Journal of Astrophysics and Astronomy (2011)

  4. No Access

    Article

    Broad line and multi-wave luminosity relations in Fermi FSRQs

    We study broad line and multi-wave luminosity relations for 80 flat-spectrum radio quasars (FSRQs) detected by Fermi LAT. Our results are as follows: for FSRQs, the correlations between logL ...

    D. R. **ong, H. J. Zhang, X. Zhang, Y. G. Zheng, T. F. Yi… in Astrophysics and Space Science (2013)

  5. No Access

    Article

    Delta-function Approximation SSC Model in 3C 273

    We obtain an approximate analytical solution using δ approximate calculation on the traditional one-zone synchrotron self-Compton (SSC) model. In this model, we describe the electron energy distribution by a brok...

    S. J. Kang, Y. G. Zheng, Q. Wu in Journal of Astrophysics and Astronomy (2014)

  6. No Access

    Article

    γ-Ray Emission from the Extreme Blazar 1ES 0229 + 200

    Based on the traditional Synchrotron Self-Compton (SSC) model, we consider a secondary γ-ray emission component to an extreme blazar 1ES 0229 + 200 for the multiwavelength radiation. By assuming a suitable electr...

    J. Li, T. Kang, Y. G. Zheng in Journal of Astrophysics and Astronomy (2014)

  7. No Access

    Article

    Fractal Property in the Light Curve of BL Lac Object S5 0716 + 714

    In this paper, we compile the historical R-band data of S5 0716 + 714 from literature and obtain its fractal dimension by using a fractal method and then simulate the data with the Weierstrass–Mandelbrot (W–M)...

    J. W. Ou, Y. G. Zheng in Journal of Astrophysics and Astronomy (2014)

  8. No Access

    Article

    Power Spectrum Density of Stochastic Oscillating Accretion Disk

    In this paper, we employ a stochastic oscillating accretion disk model for the power spectral index and variability of BL Lac object S5 0716+714. In the model, we assume that there is a relativistic oscillatio...

    G. B. Long, J. W. Ou, Y. G. Zheng in Journal of Astrophysics and Astronomy (2016)

  9. No Access

    Article

    GeV-TeV \(\gamma \) -ray energy spectral break of BL Lac objects

    In this paper, we compile the very-high-energy and high-energy spectral indices of 43 BL Lac objects from the literature. Based on a simple math model, ...

    W. Zhong, W. G. Liu, Y. G. Zheng in Astrophysics and Space Science (2018)

  10. No Access

    Article

    Establishing a particle distribution for multi-wavelength emission from BL Lac objects

    Electrons are accelerated at the shock wave diffuse and advect outward, and subsequently drift away into the emitting region of the jet that is located in the downstream flow from the plane shock. The current ...

    X. X. **e, K. R. Zhu, S. J. Kang, Y. G. Zheng in Astrophysics and Space Science (2020)

  11. No Access

    Article

    Two components model for TeV \(\gamma \) -ray emission from extreme high-energy BL Lac objects

    Extreme high-energy peaked BL Lac objects (EHBLs) are an emerging class of blazars with exceptional spectral properties, e.g., enhanced emission in the hard X-ray region and a hard spectrum at very high ...

    Q. Dong, Y. G. Zheng, C. Y. Yang in Astrophysics and Space Science (2021)