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Dark Energy Survey reveals most accurate measurement of dark matter structure in the universe（图）
Dark Energy Survey most accurate measurement dark matter structure the universe
2017/9/4
Imagine planting a single seed and, with great precision, being able to predict the exact height of the tree that grows from it. Now imagine traveling to the future and snapping photographic proof tha...
Diffuse emission measurement with INTEGRAL/SPI as indirect probe of cosmic-ray electrons and positrons
Galaxy: general ?Galaxy structure ?gamma rays observations
2011/8/24
Significant advances have been made in the understanding of the diffuse Galactic hard X-ray continuum emission using data from the INTEGRAL observatory. The diffuse hard power-law component seen with ...
Shapiro delay measurement of a two solar mass neutron star
Shapiro delay measurement solar mass neutron star
2011/1/11
Neutron stars are composed of the densest form of matter known to exist in our universe, and thus provide a unique laboratory for exploring the properties of cold matter at super-nuclear density. Meas...
Measurement of the antiproton/proton ratio in the few-TeV energy range with ARGO-YBJ
Measurement antiproton/proton ratio ARGO-YBJ
2010/11/15
Cosmic ray antiprotons provide an important probe for the study of cosmic ray propagation in the interstellar space and to investigate the existence of Galactic dark matter.The ARGO-YBJ experiment is ...
Towards Precision LSST Weak-Lensing Measurement - I: Impacts of Atmospheric Turbulence and Optical Aberration
Astronomical Instrumentation gravitational lensing dark matter cosmology
2010/11/12
The weak-lensing science of the Large Synoptic Survey Telescope (LSST)project drives the need to carefully model and separate the instrumental arti-facts from the intrinsic shear signal caused by grav...
Extended atmospheres of AGB stars: modeling and measurement
Extended atmospheres AGB stars modeling measurement
2010/11/12
Encoded in the time- and wavelength dependent properties of pulsating AGB stars are the underlying fundamental parameters of mass, composition and evolutionary state. However, the standard technique o...
A ground-based measurement of the relativistic beaming effect in a detached double WD binary
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/28
We report on the first ground-based measurement of the relativistic beaming effect (aka Doppler boosting).
Measurement of a Metallicity Gradient in a z=2 Galaxy: Implications for Inside-Out Assembly Histories
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/27
We present near-infrared imaging spectroscopy of the strongly-lensed z=2.00 galaxy SDSS J120601.69+514227.8 (`the Clone arc'). Using OSIRIS on the Keck 2 telescope with laser guide star adaptive optic...
Elliptical Weighted HOLICs for Weak Lensing Shear Measurement. part1:Definitions and isotropic PSF correction
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/23
We develop a new method to estimate gravitational shear by adopting an elliptical weight function to measure background galaxy images. In doing so, we introduce a new concept of "zero plane" which is ...
MEASUREMENT OF THE LICK INDICES IN EARLY-TYPE GALAXIES: LINE-OF-SIGHT VELOCITY DISTRIBUTION CORRECTIONS FOR IC 1459
Line: profiles Methods: data analysis Galaxies: elliptical and lenticular, cD Galaxies: kinematics and dynamics Galaxies: individual (IC 1459)
2010/10/29
In this paper we analyse the measurements of the absorption line-strength Lick indices in the early-type galaxy IC 1459. We use the long-slit spectra of the elliptical galaxy IC 1459 from which its ki...
Lsst cloud cover measurement for observation scheduling。