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A distant quasar may have its light split into multiple images by a foreground galaxy cluster that acts as a gravitational lens. The light travels along different paths of differing lengths to form ea...
Accurate Group Delay Measurement for Radial Velocity Instruments Using the Dispersed Fixed Delay Interferometer Method
Radial Velocity Dispersed Interferometer Method
2011/9/30
The Dispersed Fixed Delay Interferometer (DFDI) method is attractive for its low cost, compact size and multi-object capability in precision radial velocity (RV) measurements. The phase shift of fring...
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...
Type-Ia supernovae: new clues to their progenitors from the delay-time distribution
supernovae general
2010/11/10
Despite their prominent role in cosmography, little is yet known about the nature of type-Ia supernovae (SNe Ia),from the identity of their progenitor systems, through the evolution of those systems u...
Type Ia Supernova Delay Times and Rates for Sub-Chandrasekhar Mass Models
binaries close – stars evolution supernovae white dwarfs
2010/11/11
We present theoretical delay time distributions and rates of Type Ia SNe from the formation channels that are thought to lead to Type Ia supernovae, including the sub-Chandrasekhar mass model, using t...
Spectral Energy Distribution of z>1 Type Ia Supernova Hosts in GOODS: Constraints on Evolutionary Delay and the Initial Mass Function
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2011/1/6
We identify a sample of 22 host galaxies of Type Ia Supernovae (SNe Ia) at redshifts 0.95 discovered in the Hubble Space Telescope (HST) observations of the Great Observatories Origins Deep Surv...
Effect of Magnetic Activity on Ionospheric Time Delay at Low Latitude
Ionospheric time delay scintillation TEC geomagnetic storm
2010/9/16
The purpose of this work is to investigate the effect of magnetic activity on ionospheric time delay at low latitude Station Bhopal (geom. lat. 23.2◦N, geom. long. 77.6◦E) using dual frequ...
An All-Sky Extrasolar Planet Survey with Multiple Object, Dispersed Fixed-delay Interferometers
Planet Survey Multiple Object Fixed-delay Interferometers
2009/7/1
An All-Sky Extrasolar Planet Survey with Multiple Object, Dispersed Fixed-delay Interferometers。
Effect of Magnetic Activity on Ionospheric Time Delay at Low Latitude
Ionospheric time delay scintillation TEC geomagnetic storm
2009/5/6
The purpose of this work is to investigate the effect of magnetic
activity on ionospheric time delay at low latitude Station Bhopal
(geom. lat. 23.2◦N, geom. long. 77.6◦E) using dual fre...