220 citations · 591 across the 11 of their papers we have counts for
13 papers · 1 filter
Two types of softening detected in X-ray afterglows of Swift bursts: internal and external shock origins?
Y. -P. Qin, A. C. Gupta, J. H. Fan +1
The softening process observed in the steep decay phase of early X-ray afterglows of Swift bursts has remained a puzzle since its discovery. The softening process can also be obser…
Optical Intra-day Variability in Blazars
A. C. Gupta, J. H. Fan, J. M. Bai +1
We selected a sample of a dozen blazars which are the prime candidates for simultaneous multi-wavelength observing campaigns in their outburst phase. We searched for optical outbur…
A possible disk mechanism for the 23d QPO in Mkn~501
J. H. Fan, F. M. Rieger, T. X. Hua +7
Optically thin two-temperature accretion flows may be thermally and viscously stable, but acoustically unstable. Here we propose that the O-mode instability of a cooling-dominated…
Radio variability properties for radio sources
J. H. Fan, Y. Liu, Y. H. Yuan
In this paper, we used the database of the university of Michigan Radio Astronomy Observatory (UMRAO) at three (4.8 GHz, 8.0 GHZ, and 14.5 GHz) radio frequency to analyze the radio…
Hardness ratio evolutionary curves of gamma-ray bursts expected by the curvature effect
Y. -P. Qin, C. -Y. Su, J. H. Fan +1
We have investigated the gamma-ray bursts pulses assumed to arise from relativistically expending fireballs. We find, due to the curvature effect, the evolutionary curve of the raw…
The basic parameters of gamma-ray-loud blazars
J. H. Fan
We determined the basic parameters, such as the central black hole mass (), the boosting factor (or Doppler factor) (), the propagation angle () and the distance along the…