H Uehara,Si Inutsuka
H Uehara
We investigate thermal and dynamical evolution of a primordial gas cloud with an updated deuterium chemistry. We consider a fragment of a postshock-cooled sheet that is expected to form by collapse of a massive cloud ( greater, similar108 M...
Halo Profiles and the Nonlinear Two- and Three-Point Correlation Functions of Cosmological Mass Density [0.03%]
Halo函数与宇宙学质量密度的二阶和三阶非线性相关函数
CP Ma,JN Fry
CP Ma
We investigate the nonlinear two- and three-point correlation functions of the cosmological density field in Fourier space and test the popular hierarchical clustering model that assumes a scale-independent three-point amplitude Q. In high-...
Initial Time Dependence of Abundances in Solar Energetic Particle Events [0.03%]
太阳宇宙射线事件中丰度的初始时间依赖性
DV Reames,CK Ng,AJ Tylka
DV Reames
We compare the initial behavior of Fe/O and He/H abundance ratios and their relationship to the evolution of the proton energy spectra in "small" and "large" gradual solar energetic particle (SEP) events. The results are qualitatively consi...
S Giordano,E Antonucci,G Noci et al.
S Giordano et al.
The present spectroscopic study of the ultraviolet coronal emission in a polar hole, detected on 1996 April 6-9 with the Ultraviolet Coronagraph Spectrometer aboard the Solar and Heliospheric Observatory spacecraft, identifies the interplum...
HS Hudson
HS Hudson
Coronal events such as flares or coronal mass ejections derive their energy from the energy stored locally in the magnetic field. This leads to the conjecture that a magnetic implosion must occur simultaneously with the energy release. The ...
Ultraviolet Photoprocessing of Interstellar Dust Mantles as a Source of Polycyclic Aromatic Hydrocarbons and Other Conjugated Molecules [0.03%]
紫外线光解星际尘粒包层作为稠环芳香烃和其他共轭分子的来源
JM Greenberg,JS Gillette,Muñoz Caro GM et al.
JM Greenberg et al.
By co-depositing a gas mixture of simple carbon- and nitrogen-containing molecules with water on a 10 K surface and exposing it to ultraviolet radiation, we were able to form a residue. This residue was then placed aboard the EURECA satelli...
Analysis of the Hipparcos Measurements of HD 10697: A Mass Determination of a Brown Dwarf Secondary [0.03%]
对Hipparcos卫星观测恒星HD 10697数据分析及 brown dwarf 质量测定
S Zucker,T Mazeh
S Zucker
HD 10697 is a nearby main-sequence star around which a planet candidate has recently been discovered by means of radial velocity measurements (Vogt et al.). The stellar orbit has a period of about 3 yr, the secondary minimum mass is 6.35 Ju...
The Discovery of a Second Field Methane Brown Dwarf from Sloan Digital Sky Survey Commissioning Data [0.03%]
从Sloan数字天空调查试观测数据中发现第二颗甲烷棕色矮星
ZI Tsvetanov,DA Golimowski,W Zheng et al.
ZI Tsvetanov et al.
We report the discovery of a second field methane brown dwarf from the commissioning data of the Sloan Digital Sky Survey (SDSS). The object, SDSS J134646.45-003150.4 (hereafter SDSS 1346-00), was selected because of its very red color and ...
Discovery of a Brown Dwarf Companion to Gliese 570ABC: A 2MASS T Dwarf Significantly Cooler than Gliese 229B [0.03%]
发现Gliese 570ABC伴系外行星：一颗比Gliese 229B更冷的T型棕矮星
AJ Burgasser,JD Kirkpatrick,RM Cutri et al.
AJ Burgasser et al.
We report the discovery of a widely separated (258&farcs;3+/-0&farcs;4) T dwarf companion to the Gl 570ABC system. This new component, Gl 570D, was initially identified from the Two Micron All-Sky Survey. Its near-infrared spectrum shows th...
The Compact Central Object in Cassiopeia A: A Neutron Star with Hot Polar Caps or a Black Hole? [0.03%]
仙王座A的紧致中心天体：一个拥有炽热极区的中子星或是一个黑洞？
GG Pavlov,VE Zavlin,B Aschenbach et al.
GG Pavlov et al.
The central pointlike X-ray source of the Cassiopeia A supernova remnant was discovered in the Chandra first light observation and found later in the archival ROSAT and Einstein images. The analysis of these data does not show statistically...