Quasi-Periodic Variability and the Inner Radii of Thin Accretion Disks in Galactic Black Hole Systems [0.03%]
银河系黑洞系统中的准周期变异性及其薄盘的内半径大小关系
Di Matteo T,D Psaltis
Di Matteo T
We calculate upper bounds on the inner radii of geometrically thin accretion disks in galactic black hole systems by relating their rapid variability properties to those of neutron stars. We infer that the inner disk radii do not exhibit la...
Gamma-Ray Emission from Novae Related to Positron Annihilation: Constraints on its Observability Posed by New Experimental Nuclear Data [0.03%]
新的实验核数据对与正电子湮灭有关的新星γ射线观测限制约束
M Hernanz,J José,A Coc et al.
M Hernanz et al.
Classical novae emit gamma-ray radiation at 511 keV and below (with a cutoff at around 20-30 keV), related to positron annihilation and its Comptonization in the expanding envelope. This emission has been elusive up to now because it occurs...
E Göğüş,PM Woods,C Kouveliotou et al.
E Göğüş et al.
We study the statistics of soft gamma repeater (SGR) bursts using a database of 187 events detected with BATSE and 837 events detected with the Rossi X-Ray Timing Explorer Proportional Counter Array; all events are from SGR 1900+14 during i...
Spiral Density Wave Shock-induced Star Formation at High Galactic Latitudes [0.03%]
螺旋致密波激波触发的高银纬恒星形成
M Martos,C Allen,J Franco et al.
M Martos et al.
We have modeled the gas response to a spiral density wave (SDW) in a thick, magnetized galactic disk. The inclusion in the model of the vertically extended galactic warm ionized gas layer alters the conventional view of the SDW scenario for...
RJ Sault,J Macquart
RJ Sault
Recently, Bower, Falcke, & Backer reported the detection of circular polarization from the Galactic center black hole candidate Sagittarius A*. We provide an independent confirmation of this detection and some analysis on the possible mecha...
Simultaneous X-Ray and TeV Observations of a Rapid Flare from Markarian 421 [0.03%]
活动星系核马克arios 421的X射线和TeV同时观测研究
L Maraschi,G Fossati,F Tavecchio et al.
L Maraschi et al.
Mrk 421 was observed for about 2 days with BeppoSAX in 1998 April as part of a worldwide multiwavelength campaign. A large, well-defined flare was observed in X-rays. The same flare was observed simultaneously at TeV energies by the Whipple...
NICMOS Imaging of the Dusty Microjansky Radio Source VLA J123642+621331 at z = 4.424 [0.03%]
蝘蜓座VLA J123642+621331尘埃微毫秒级无线电源的NICMOS成像：红移z=4.424
I Waddington I,RA Windhorst,SH Cohen et al.
I Waddington I et al.
We present the discovery of a radio galaxy at a likely redshift of z=4.424 in one of the flanking fields of the Hubble Deep Field (HDF). Radio observations with the Very Large Array and MERLIN centered on the HDF yielded a complete sample o...
EA Richards,EB Fomalont,KI Kellermann et al.
EA Richards et al.
We report on the identifications of radio sources from our survey of the Hubble Deep Field (HDF) and the Small Selected Area 13 fields, both of which comprise the deepest radio surveys to date at 1.4 and 8.5 GHz, respectively. About 80% of ...
The Contribution of Normal, Dim, and Dwarf Galaxies to the Local Luminosity Density [0.03%]
正常星系、矮暗星系以及 dwarf 纳光源对本域发光密度的贡献
SP Driver
SP Driver
From the Hubble Deep Field catalog recently presented by Driver et al., we derive the local (0.3
T Totani,C Kobayashi
T Totani
We have made a quantitative calculation for the systematic evolution of the average extinction by interstellar dust in host galaxies of high-redshift Type Ia supernovae by using a realistic model of photometric and chemical evolution of gal...