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- Yunnan UniversityCN7 papers
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- CAS Key Laboratory of Quantum Information, USTCCN3 papers
- Chinese Academy of SciencesCN3 papers
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7 papers · 1 filter
The optical spectral features of 27 Fermi blazars
Bing-Kai Zhang, Wei-Feng Tang, Chun-Xiao Wang +4
A spectral variation accompanied with flux variability is a commonly-observed phenomenon for blazars. In order to further investigate the optical spectral feature of blazars, we ha…
Optical Spectral Variations of a Large Sample of Fermi Blazars
Zhang Bing-Kai, Zhao Xiao-Yun, Wu Qi
We have investigated the optical spectral behavior of a large sample of Fermi blazars (40 FSRQs and 13 BL Lacs), and found two new universal optical spectral behaviors. In the low…
Long-term multi-wavelength variations of Fermi blazar 3C 279
Bing-Kai Zhang, Min Jin, Xiao-Yun Zhao +2
The long-term optical, X-ray and -ray data of blazar 3C 279 have been compiled from -XRT, PCA, -LAT, SMARTS and literature. The source exhibits strong varia…
The Knee of the Cosmic Hydrogen and Helium Spectrum below 1 PeV Measured by ARGO-YBJ and a Cherenkov Telescope of LHAASO
B. Bartoli, P. Bernardini, X. J. Bi +93
The measurement of cosmic ray energy spectra, in particular for individual species, is an essential approach in finding their origin. Locating the "knees" of the spectra is an impo…
Optical quasi-periodic oscillation and color behavior of blazar PKS 2155-304
Bing-Kai Zhang, Xiao-Yun Zhao, Chun-Xiao Wang +1
PKS 2155-304 is a well studied BL Lac object in the southern sky. The historical optical data during different period have been collected and compiled. Light curves with a time spa…
Energy Spectrum of Cosmic Protons and Helium Nuclei by a Hybrid Measurement at 4300 m a.s.l
B. Bartoli, P. Bernardini, X. J. Bi +97
The energy spectrum of cosmic Hydrogen and Helium nuclei has been measured, below the so-called "knee", by using a hybrid experiment with a wide field-of-view Cherenkov telescope a…