144 citations · 913 across the 22 of their papers we have counts for
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astro-ph2005★ 51 cited
XMM-Newton view of PKS 2155-304: hardness ratio and cross-correlation analysis of EPIC pn observations
Y. H. Zhang, A. Treves, L. Maraschi +2
With currently available XMM-Newton EPIC pn observations spanned over about 3 years, we present a detailed spectral and temporal variability of the 0.2--10 keV X-ray emission from…
astro-ph1996★ 43 cited
The long-term optical behavior of MRK421
F. K. Liu, B. F. Liu, G. Z. Xie
All data available in B band for the BL Lac object MRK421 from 22 publications are used to construct a historical light curve, dating back to 1900. It is found that the light curve…
astro-ph1995★ 55 cited
Polytropic gas spheres: An approximate analytic solution of the Lane-Emden equation
F. K. Liu
Polytropic models play a very important role in galactic dynamics and in the theory of stellar structure and evolution. However, in general, the solution of the Lane-Emden equation…