On the Disappearance of Kilohertz Quasi-periodic Oscillations at a High Mass Accretion Rate in Low-Mass X-Ray Binaries [0.03%]
低质量X射线双星中超大量吸积状态下千赫兹准周期振荡的消失现象研究
W Cui
W Cui
For all sources in which the phenomenon of kilohertz quasi-periodic oscillation (kHz QPO) is observed, the QPOs disappear abruptly when the inferred mass accretion rate exceeds a certain threshold. Although the threshold cannot at present b...
JC Shields,HW Rix,DH McIntosh et al.
JC Shields et al.
We present spectroscopic observations from the Hubble Space Telescope that reveal for the first time the presence of a broad pedestal of Balmer line emission in the LINER galaxy NGC 4203. The emission-line profile is suggestive of a relativ...
Interplanetary Network Localization of GRB 991208 and the Discovery of its Afterglow [0.03%]
星际网络定位GRB 991208及其余晖的发现
K Hurley,T Cline,E Mazets et al.
K Hurley et al.
The extremely energetic ( approximately 10-4 ergs cm-2) gamma-ray burst (GRB) of 1999 December 8 was triangulated to an approximately 14 arcmin2 error box approximately 1.8 days after its arrival at Earth with the third interplanetary netwo...
Strong Lensing Reconstruction [0.03%]
强透镜重构
UL Pen
UL Pen
We present a general linear algorithm for measuring the surface mass density 1-kappa from the observable reduced shear g=gamma&solm0;&parl0;1-kappa&parr0; in the strong lensing regime. We show that in general, the observed polarization fiel...
A Spectroscopic Redshift for the Cl 0024+16 Multiple Arc System: Implications for the Central Mass Distribution [0.03%]
Cl 0024+16多重弧系统的光谱红移：对中心质量分布的启示
T Broadhurst,X Huang,B Frye et al.
T Broadhurst et al.
We present a spectroscopic redshift of z=1.675 for the well-known multiply lensed system of arcs seen in the z=0.39 cluster Cl 0024+16. In contrast to earlier work, we find that the lensed images are accurately reproduced by a projected mas...
JA Newman,M Davis
JA Newman
The classical dN/dz test allows one to determine fundamental cosmological parameters from the evolution of the cosmic volume element. This test is applied by measuring the redshift distribution of a tracer whose evolution in number density ...
R Fusco-Femiano,Dal Fiume D,De Grandi S et al.
R Fusco-Femiano et al.
After the positive detection by BeppoSAX of hard X-ray radiation up to approximately 80 keV in the Coma Cluster spectrum, we present evidence for nonthermal emission from A2256 in excess of thermal emission at a 4.6 sigma confidence level. ...
Intervening O vi Quasar Absorption Systems at Low Redshift: A Significant Baryon Reservoir [0.03%]
低红移O[vi]类淬灭吸收系统：重要的重子库
TM Tripp,BD Savage,EB Jenkins
TM Tripp
Far-UV echelle spectroscopy of the radio-quiet QSO H1821+643 (zem=0.297), obtained with the Space Telescope Imaging Spectrograph (STIS) at approximately 7 km s-1 resolution, reveals four definite O vi absorption-line systems and one probabl...
MJ Kurtz,DJ Mink
MJ Kurtz
We develop a new method for estimating and removing the spectrum of the sky from deep spectroscopic observations. Our method does not rely on simultaneous measurement of the sky spectrum with the object spectrum. The technique is based on t...
Transition Probabilities for the 1815 and 3344 Å Forbidden Lines of Ne iii [0.03%]
Ne III的1815和3344Å forbidden线的跃迁几率
A Daw,WH Parkinson,PL Smith et al.
A Daw et al.
We have measured the radiative lifetime of the 2s22p4 1S0 metastable level of Ne2+ (Ne iii) to be 223+/-11 ms at the 90% confidence level by observing the photons emitted at 1815 Å by a decaying population of 1S0 Ne2+ ions produced and sto...