Broad Emission Line Regions in Active Galactic Nuclei: The Link with the Accretion Power [0.03%]
活动星系核中的广线区与吸积能量的关系
F Nicastro
F Nicastro
We present a model that relates the width of the broad emission lines of active galactic nuclei (AGNs) to the Keplerian velocity of an accretion disk at a critical distance from the central black hole. This critical distance falls in a regi...
The Space Density of Primordial Gas Clouds near Galaxies and Groups and their Relation to Galactic High-Velocity Clouds [0.03%]
关于星系和星系群附近的原初气体云的空间密度及其与银河系高纬度云的关系
MA Zwaan,FH Briggs
MA Zwaan
The Arecibo H i Strip Survey probed the halos of approximately 300 cataloged galaxies and the environments of approximately 14 groups with sensitivity to neutral hydrogen masses >/=107 M middle dot in circle. The survey detected no objects ...
SG Ryan,TC Beers,KA Olive et al.
SG Ryan et al.
Recent determinations of the abundance of the light-element Li in very metal-poor stars show that its intrinsic dispersion is essentially zero and that the random error in the estimated mean Li abundance is negligible. However, a decreasing...
Young Red Spheroidal Galaxies in the Hubble Deep Fields: Evidence for a Truncated Initial Mass Function at approximately 2 M middle dot in circle and a Constant Space Density to z approximately 2 [0.03%]
哈勃深场中的年轻红色星系：在大约2M圆太阳处初始质量函数截断的证据以及到z=2的大致恒定空间密度
T Broadhurst,RJ Bouwens
T Broadhurst
The optical-IR images of the northern and southern Hubble Deep Fields are used to measure the spectral and density evolution of early-type galaxies. The mean spectral energy distribution is found to evolve passively toward a mid-F star-domi...
HW Lee,S Hyung
HW Lee
The young and compact planetary nebula IC 4997 is known to exhibit very broad wings with a width exceeding 5000 km s-1 around Halpha. We propose that the broad wings are formed through Rayleigh-Raman scattering that involves atomic hydrogen...
Evolutionary Model and Oscillation Frequencies for alpha Ursae Majoris: A Comparison with Observations [0.03%]
大熊座α星的演化模型及振荡频率与观测结果的比较
DB Guenther,P Demarque,D Buzasi et al.
DB Guenther et al.
Inspired by the observations of low-amplitude oscillations of alpha Ursae Majoris A by Buzasi et al. using the WIRE satellite, a grid of stellar evolutionary tracks has been constructed to derive physically consistent interior models for th...
RR Lyrae Stars in NGC 6388 and NGC 6441: A New Oosterhoff Group? [0.03%]
NGC 6388和NGC 6441中的RR Lyrae星：“Oosterhoff”新组？
B Pritzl,HA Smith,M Catelan et al.
B Pritzl et al.
NGC 6388 and NGC 6441 are anomalies among Galactic globular clusters in that they cannot be readily placed into either Oosterhoff group I or Oosterhoff group II despite their significant numbers of RR Lyrae variables. The mean pulsation per...
The Temperature and Cooling Age of the White Dwarf Companion to the Millisecond Pulsar PSR B1855+09 [0.03%]
射电毫秒脉冲星PSR B1855+09的白矮星星伴星的温度和冷却年龄
van Kerkwijk MH,JF Bell,VM Kaspi et al.
van Kerkwijk MH et al.
We report on Keck and Hubble Space Telescope observations of the binary millisecond pulsar PSR B1855+09. We detect its white dwarf companion and measure mF555W=25.90+/-0.12 and mF814W=24.19+/-0.11 (Vega system). From the reddening-corrected...
RH Corbet,AG Peele
RH Corbet
We present the results of Rossi X-Ray Timing Explorer (RXTE) observations of the Be star X-ray binary system RX J0812.4-3114. A light curve obtained with the RXTE All-Sky Monitor (ASM) shows that the source is currently in an active state w...
R Fender,D Rayner,R Norris et al.
R Fender et al.
We report the discovery of circularly polarized radio emission from the radio-jet X-ray binary SS 433 with the Australia Telescope Compact Array. The flux density spectrum of the circular polarization, clearly detected at four frequencies b...