搜索结果: 1-15 共查到“知识库 基本天体测量学”相关记录25条 . 查询时间(1.499 秒)
Accelerating Radio Astronomy Cross-Correlation with Graphics Processing Units
Radio astronomy Graphics Processing Unit Signal Processing Correlation
2011/10/13
We present a highly parallel implementation of the cross-correlation of time-series data using graphics processing units (GPUs), which is scalable to hundreds of independent inputs and suitable for th...
Local Scale-Dependent Non-Gaussian Curvature Perturbations at Cubic Order
E ective Field Theory Cosmology In ation Non-Gaussianity
2011/10/17
We calculate non-Gaussianities in the bispectrum and trispectrum arising from the cubic term in the local expansion of the scalar curvature perturbation. We compute to three-loop order and for general...
Viscous Little Rip Cosmology
Viscous Little Rip Cosmology
2011/10/17
Dark energy of phantom or quintessence nature with an equation of state parameter $w$ almost equal to -1 often leads the universe evolution to a finite-time future singularity. An elegant solution to ...
PSR J0007+7303 in the CTA1 SNR: New Gamma-ray Results from Two Years of Fermi-LAT Observations
CTA1 SNR:Gamma-ray Results Fermi-LAT Observations
2011/10/12
One of the main results of the Fermi Gamma-Ray Space Telescope is the discovery of {\gamma}-ray selected pulsars. The high magnetic field pulsar, PSR J0007+7303 in CTA1, was the first ever to be disco...
Kinematic signature of an intermediate-mass black hole in the globular cluster NGC 6388
black hole physics – globular cluster: individual (NGC 6388) – stars: kinematics and dynamics
2011/10/12
Intermediate-mass black holes (IMBHs) are of interest in a wide range of astrophysical fields. In particular, the possibility of finding them at the centers of globular clusters has recently drawn att...
Unexpected Formation Modes of the First Hard Binary in Core Collapse
Stellar dynamics, Method: N-body simulation, globular clusters: genera
2011/10/12
The conventional wisdom for the formation of the first hard binary in core collapse is that three-body interactions of single stars form many soft binaries, most of which are quickly destroyed, but ev...
Radiative transfer and molecular data for astrochemistry (Review)
radiative transfer atomic data molecular data
2011/10/10
The estimation of molecular abundances in interstellar clouds from spectroscopic observations requires radiative transfer calculations, which depend on basic molecular input data. This paper reviews r...
Light dark matter (DM) models with isospin violation (ISV) and large DM-nucleon spin-independent cross section \sigma_n may provide a way to understand the confusing DM direct detection experimental r...
Longer-Baseline Telescopes Using Quantum Repeaters
Longer-Baseline Telescopes Using Quantum Repeaters
2011/10/17
We present an approach to building interferometric telescopes using ideas of quantum information. Current optical interferometers have limited baseline lengths, and thus limited resolution, because of...
Numerical simulations of black-hole binaries and gravitational wave emission
Numerical Relativity Black Holes Gravitational Wave Physics Astrophysics High-Energy Physics
2011/10/17
We review recent progress in numerical relativity simulations of black-hole (BH) spacetimes. Following a brief summary of the methods employed in the modeling, we summarize the key results in three ma...
Evolution of non-Gaussianity in multi-scalar field models
Infl ation Cosmological perturbation theory Physics of the early universe
2011/10/8
We study the evolution of non-Gaussianity in multiple-field inflationary models, focusing on three fundamental questions: (a) How is the sign and peak magnitude of the non-linearity parameter fNL rela...
An aluminum/calcium-rich, iron-poor, white dwarf star: evidence for an extrasolar planetary lithosphere?
calcium-rich iron-poor evidence extrasolar planetary lithosphere
2011/10/8
The presence of elements heavier than helium in white dwarf atmospheres is often a signpost for the existence of rocky objects that currently or previously orbited these stars. We have measured the ab...
Multiple stellar populations in the Globular Clusters NGC1851 and NGC6656 (M22)
Stars: abundances – Stars: atmospheres – Stars: Population II – Galaxy: glob- ular clusters
2011/9/30
In the last years, photometric and spectroscopic evidence has demonstrated that many, maybe all the Globular Clusters (GC) host multiple stellar populations. High-resolution spectroscopy has establish...
The short-period low-mass binary system CC Com revis
stars binaries:close stars:individual (CC Com) stars:low-mass stars:evolution
2011/9/27
In this study we determined precise orbital and physical parameters of the very short period low-mass contact binary system CC Com. The parameters are obtained by analysis of the new CCD data with the...
Analytical Treatment of the Two-Body Problem with Slowly Varying Mass
Mass loss—binary systems—two-body problem—perturbations.
2010/9/15
The present work is concerned with the two-body problem with varying mass in case of isotropic mass loss from both components of the binary systems. The law of mass variation used gives rise to a pert...