C. T. Yan
Chinese Academy of Sciences
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Publication
Featured researches published by C. T. Yan.
The Astrophysical Journal | 2005
M. Amenomori; S. Ayabe; S. W. Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. Feng; Z. Y. Feng; X. Y. Gao; Q. X. Geng; H. W. Guo; H. H. He; M. He; K. Hibino; N. Hotta; Haibing Hu; H. B. Hu; J. Huang; Q. Huang; H. Y. Jia; F. Kajino; K. Kasahara; Y. Katayose; C. Kato; K. Kawata; Labaciren; G. M. Le; J. Y. Li; H. Lu; S. L. Lu
We present the large-scale sidereal anisotropy of Galactic cosmic-ray intensity in the multi-TeV region observed with the Tibet-III air shower array during the period from 1999 through 2003. The sidereal daily variation of cosmic rays observed in this experiment shows an excess of relative intensity around 4-7 hr local sidereal time as well as a deficit around 12 hr local sidereal time. While the amplitude of the excess is not significant when averaged over all declinations, the excess in individual declination bands becomes larger and clearer as the viewing direction moves toward the south. The maximum phase of the excess intensity changes from ~7 hr at the Northern Hemisphere to ~4 hr at the equatorial region. We also show that both the amplitude and the phase of the first harmonic vector of the daily variation are remarkably independent of primary energy in the multi-TeV region. This is the first result determining the energy and declination dependences of the full 24 hr profiles of the sidereal daily variation in the multi-TeV region with a single air shower experiment.
The Astrophysical Journal | 2009
Jian-Min Wang; Chen Hu; Yan-Rong Li; Yan-Mei Chen; A. R. King; A. Marconi; Luis C. Ho; C. T. Yan; Rüdiger Staubert; Shu Zhang
The growth of supermassive black holes (BHs) located at the centers of their host galaxies comes mainly from accretion of gas, but how to fuel them remains an outstanding unsolved problem in quasar evolution. This issue can be elucidated by quantifying the radiative efficiency parameter (
The Astrophysical Journal | 2005
M. Amenomori; S. Ayabe; D. Chen; Shuwang Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. Feng; Z. Y. Feng; X. Y. Gao; Q. X. Geng; H. W. Guo; H. H. He; M. He; K. Hibino; N. Hotta; Haibing Hu; H. B. Hu; J. Huang; Q. Huang; H. Y. Jia; F. Kajino; K. Kasahara; Y. Katayose; C. Kato; K. Kawata; Labaciren; G. M. Le; J. Y. Li; H. Lu
\eta
The Astrophysical Journal | 2010
M. Amenomori; X. J. Bi; D. Chen; S. W. Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. Fan; C. F. Feng; Zhaoyang Feng; Z. Y. Feng; X. Y. Gao; Q. X. Geng; Q. B. Gou; H. W. Guo; H. H. He; M. He; K. Hibino; N. Hotta; Haibing Hu; H. B. Hu; J. Huang; Q. Huang; H. Y. Jia; L. Jiang; F. Kajino; K. Kasahara; Y. Katayose; C. Kato; K. Kawata
) as a function of redshift, which also provides constraints on the average spin of the BHs and its possible evolution with time. We derive a formalism to link
The Astrophysical Journal | 2009
Yan-Mei Chen; Jian-Min Wang; C. T. Yan; Chen Hu; Shu Zhang
\eta
Physical Review Letters | 2004
Michihiro Amenomori; S. Ayabe; S. W. Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. Feng; Z. Y. Feng; X. Y. Gao; Q. X. Geng; H. W. Guo; H. H. He; M. He; K. Hibino; Norifumi Hotta; Haibing Hu; H. B. Hu; J. Huang; Q. Huang; H. Y. Jia; F. Kajino; Kazuo Kasahara; Y. Katayose; C. Kato; K. Kawata; Labaciren; G. M. Le; J. Y. Li; H. Lu; S. L. Lu
with the luminosity density, BH mass density, and duty cycle of quasars, quantities we can estimate from existing quasar and galaxy survey data. We find that
The Astrophysical Journal | 2015
C. T. Yan; Youjun Lu; Xinyu Dai; Qingjuan Yu
\eta
The Astrophysical Journal | 2010
M. Amenomori; X. J. Bi; D. Chen; S. W. Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. Fan; C. F. Feng; Zhaoyang Feng; Z. Y. Feng; X. Y. Gao; Q. X. Geng; Q. B. Gou; H. W. Guo; H. H. He; M. He; K. Hibino; N. Hotta; Haibing Hu; H. B. Hu; J. Huang; Q. Huang; H. Y. Jia; L. Jiang; F. Kajino; K. Kasahara; Y. Katayose; C. Kato; K. Kawata
has a strong cosmological evolution: at z~2,
The Astrophysical Journal | 2011
Jian-Min Wang; Junqiang Ge; Chen Hu; J. A. Baldwin; Yan-Rong Li; Gary J. Ferland; Fei Xiang; C. T. Yan; Shu Zhang
\eta \approx 0.3
The Astrophysical Journal | 2007
Jian-Min Wang; Yan-Mei Chen; C. T. Yan; Chen Hu; Wei-Hao Bian
, and by
