CD Dermer,M Böttcher
CD Dermer
The blast-wave model for gamma-ray bursts (GRBs) has been called into question by observations of spectra from GRBs that are harder than can be produced through optically thin synchrotron emission. If GRBs originate from the collapse of mas...
AA Esin,R Blandford
AA Esin
The deviation from the power-law decline of the optical flux observed in GRB 970228 and GRB 980326 has been used recently to argue in favor of the connection between gamma-ray bursts and supernovae. We consider an alternative explanation fo...
J Hjorth,S Holland,F Courbin et al.
J Hjorth et al.
We present deep Hubble Space Telescope (HST) imaging, as well as ground-based imaging and spectroscopy, of the optical afterglow associated with the long-duration gamma-ray burst GRB 990712 and its host galaxy. The data were obtained 48-123...
The Structure and Evolution of Weakly Self-interacting Cold Dark Matter Halos [0.03%]
弱自相互作用冷暗物质晕的结构与演化
A Burkert
A Burkert
The evolution of halos consisting of weakly self-interacting dark matter particles is investigated using a new numerical Monte Carlo N-body method. The halos initially contain kinematically cold, dense r-1 power-law cores. For interaction c...
Mitigating Charge Transfer Inefficiency in the Chandra X-Ray Observatory Advanced CCD Imaging Spectrometer [0.03%]
减轻钱德拉X射线天文台先进CCD成像光谱仪的电荷转移效率下降问题
LK Townsley,PS Broos,GP Garmire et al.
LK Townsley et al.
The ACIS front-illuminated CCDs on board the Chandra X-Ray Observatory were damaged in the extreme environment of the Earth's radiation belts, resulting in enhanced charge transfer inefficiency (CTI). This produces a row dependence in gain,...
Chandra X-Ray Observations of the Hydra A Cluster: An Interaction between the Radio Source and the X-Ray-emitting Gas [0.03%]
复合体Hydra A的钱德拉X射线观测结果：无线电源与X射线辐射气体之间的相互作用
BR McNamara,M Wise,PE Nulsen et al.
BR McNamara et al.
We present Chandra X-ray observations of the Hydra A cluster of galaxies, and we report the discovery of structure in the central 80 kpc of the cluster's X-ray-emitting gas. The most remarkable structures are depressions in the X-ray surfac...
M Joffre,P Fischer,J Frieman et al.
M Joffre et al.
We present two weak lensing reconstructions of the nearby (zcl=0.055) merging cluster Abell 3667, based on observations taken approximately 1 yr apart under different seeing conditions. This is the lowest redshift cluster with a weak lensin...
Fluid Dark Matter [0.03%]
流体暗物质
PJ Peebles
PJ Peebles
Dark matter modeled as a classical scalar field that interacts only with gravity and with itself by a potential that is close to quartic at large field values and approaches a quadratic form when the field is small would be gravitationally ...
RA Croft,R Davé,L Hernquist et al.
RA Croft et al.
Using a high-resolution cosmological hydrodynamic simulation, we present a method to constrain extinction due to intergalactic gray dust based on the observed magnitudes of distant Type Ia supernovae. We apply several simple prescriptions t...
J Betancort-Rijo,M López-Corredoira
J Betancort-Rijo
We have developed a generalization of the Zeldovich approximation that is exact in a wide variety of situations, including planar, spherical, and cylindrical symmetries. We have shown that this generalization, which we call the complete Zel...