147 citations · 873 across the 18 of their papers we have counts for
12 papers · 1 filter
Self-similar structure of magnetized ADAFs and CDAFs
Dong Zhang, Z. G. Dai
(Abridged) We study the effects of a global magnetic field on viscously-rotating and vertically-integrated accretion disks around compact objects using a self-similar treatment. We…
Optical Flashes and Very Early Afterglows in Wind Environments
X. F. Wu, Z. G. Dai, Y. F. Huang +1
The interaction of a relativistic fireball with its ambient medium is described through two shocks: a reverse shock that propagates into the fireball, and a forward shock that prop…
External shock model for the large-scale, relativistic X-ray jets from the microquasar XTE J1550-564
X. Y. Wang, Z. G. Dai, T. Lu
Large-scale, decelerating, relativistic X-ray jets due to material ejected from the black-hole candidate X-ray transient and microquasar XTE J1550-564 has been recently discovered…
Gamma-Ray Bursts from Neutron Star Kicks
Y. F. Huang, Z. G. Dai, T. Lu +2
The idea that gamma-ray bursts might be a kind of phenomena associated with neutron star kicks was first proposed by Dar & Plaga (1999). Here we study this mechanism in more detail…
Beaming Effects in Gamma-Ray Bursts
Y. F. Huang, T. Lu, Z. G. Dai +1
Based on a refined generic dynamical model, we investigate afterglows from jetted gamma-ray burst (GRB) remnants numerically. In the relativistic phase, the light curve break could…
Possible geometries of afterglow generation in the gamma-ray burst GRB990705
X. Y. Wang, Z. G. Dai, T. Lu
The absorption feature detected in the prompt X-ray emission of GRB990705 has important consequences for its circum-burst environment and therefore on its afterglows. Here we inves…
Early GeV afterglows from gamma-ray bursts in pulsar wind bubbles
X. Y. Wang, Z. G. Dai, T. Lu
Gamma-ray bursts may occur within pulsar wind bubbles (PWBs) under a number of scenarios, such as the supranova-like models in which the progenitor pulsar drives a powerful wind sh…
Afterglow Emission from Highly Collimated Jets with Flat Electron Spectra: Application to the GRB 010222 Case?
Z. G. Dai, K. S. Cheng
We derive light curves of the afterglow emission from highly collimated jets if the power-law index () of the electron energy distribution is above 1 but below 2. We find (1) be…
The Inverse Compton Emission Spectra in the Very Early Afterglows of Gamma-Ray Bursts
X. Y. Wang, Z. G. Dai, T. Lu
We calculate the spectra of inverse Compton (IC) emissions in gamma-ray burst (GRB) shocks produced when relativistic ejecta encounters the external interstellar medium, assuming a…
Light Curves of Jetted Gamma-Ray Burst Afterglows in Circumstellar Clouds
Z. G. Dai, Y. F. Huang, T. Lu
The afterglow emission from a spreading jet expanding in a circumstellar cloud is discussed. Prompt X-ray radiation and a strong UV flash from the reverse shock produced by the int…
Prompt High Energy -Ray Emission From the Synchrotron Self-Compton Process in the Reverse Shocks of -Ray Bursts
X. Y. Wang, Z. G. Dai, T. Lu
In the standard scenario of the fireball model of gamma-ray bursts(GRBs), the huge initial energy release produces a relativistic blast wave expanding into the external medium and…
Effects of Environment and Energy Injection on Gamma-Ray Burst Afterglows
Z. G. Dai
There is growing evidence that some long gamma-ray bursts (GRBs) arise from the core collapse of massive stars, and thus it is inevitable that the environments of these GRBs are pr…