The Origin of Extremely Metal-poor Carbon Stars and the Search for Population III [0.03%]
超贫金属丰度碳星的起源及第三星族星的搜寻
MY Fujimoto,Y Ikeda
MY Fujimoto
The number of known extremely metal-deficient stars has recently increased substantially, stimulating inquiry into the formation and initial chemical evolution of the Milky Way. In order to draw proper inferences from the observations, it i...
Prompt Iron Enrichment, Two r-Process Components, and Abundances in Very Metal-Poor Stars [0.03%]
铁增丰、r过程双重成分及极贫金属星的丰度研究
GJ Wasserburg,Y Qian
GJ Wasserburg
We present a model to explain the wide range of abundances for heavy r-process elements (mass number A>130) at low [Fe/H]. This model requires rapid star formation and/or an initial population of supermassive stars in the earliest condensed...
D Lazzati,G Ghisellini,A Celotti et al.
D Lazzati et al.
It is proposed that the gamma-ray photons that characterize the prompt emission of gamma-ray bursts are produced through the Compton-drag process, which is caused by the interaction of a relativistic fireball with a very dense soft photon b...
On the Time Evolution of Gamma-Ray Burst Pulses: A Self-Consistent Description [0.03%]
伽玛射线暴脉冲的时间演化：一种自洽描述方法
F Ryde,R Svensson
F Ryde
For the first time, the consequences of combining two well-established empirical relations that describe different aspects of the spectral evolution of observed gamma-ray burst (GRB) pulses are explored. These empirical relations are (1) th...
On the Superradiance of Spin-1 Waves in an Equatorial Wedge around a Kerr Hole [0.03%]
克尔黑洞赤道楔形区域中自旋为1的波的超辐射现象研究
AN Aguirre
AN Aguirre
Recently Van Putten has suggested that superradiance of magnetosonic waves in a toroidal magnetosphere around a Kerr black hole may play a role in the central engine of gamma-ray bursts. In this context, he computed (in the WKB approximatio...
Correlation between the Halo Concentration c and the Virial Mass Mvir Determined from X-Ray Clusters [0.03%]
利用X射线星系团确定晕集中参数c与归一化晕质量Mvir的关系
XP Wu,YJ Xue
XP Wu
Numerical simulations of structure formation have suggested that there exists a good correlation between the halo concentration c (or the characteristic density deltac) and the virial mass Mvir for any virialized dark halo described by the ...
Baryon Distribution in Galaxy Clusters as a Result of Sedimentation of Helium Nuclei [0.03%]
富氦核沉淀形成的星系团中的重子分布
B Qin,XP Wu
B Qin
Heavy particles in galaxy clusters tend to be more centrally concentrated than light ones according to the Boltzmann distribution. An estimate of the drift velocity suggests that it is possible that the helium nuclei may have entirely or pa...
Comparison of Transient Network Brightenings and Explosive Events in the Solar Transition Region [0.03%]
太阳过渡区中瞬态网络增亮与爆发事件的比较
J Chae,H Wang,PR Goode et al.
J Chae et al.
The relation between transient network brightenings, known as blinkers, and explosive events is examined based on coordinated quiet Sun observations in the transition region line O v lambda630 recorded by the Coronal Diagnostic Spectrometer...
SN Raines,DM Watson,JL Pipher et al.
SN Raines et al.
We report the detection of proper motions in [Fe ii] 1.644 µm emission among the southeasternmost features in the Herbig-Haro object complex GGD 37. Imaging observations were made over a period of 5 yr, at epochs 1993.67, 1996.71, and 1998...
JP Hughes,CE Rakowski,DN Burrows et al.
JP Hughes et al.
We present results from the first light observations of the Cassiopeia A supernova remnant (SNR) by the Chandra X-Ray Observatory. Based on representative spectra from four selected regions, we investigate the processes of nucleosynthesis a...