Search results for "general – gravitational lensing"

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Flux and color variations of the quadruply imaged quasar HE 0435-1223

2011

aims: We present VRi photometric observations of the quadruply imaged quasar HE 0435-1223, carried out with the Danish 1.54m telescope at the La Silla Observatory. Our aim was to monitor and study the magnitudes and colors of each lensed component as a function of time. methods: We monitored the object during two seasons (2008 and 2009) in the VRi spectral bands, and reduced the data with two independent techniques: difference imaging and PSF (Point Spread Function) fitting.results: Between these two seasons, our results show an evident decrease in flux by ~0.2-0.4 magnitudes of the four lensed components in the three filters. We also found a significant increase (~0.05-0.015) in their V-R …

Point spread functionCosmology and Nongalactic Astrophysics (astro-ph.CO)FluxFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsGravitational microlensing01 natural scienceslaw.inventionTelescopeSettore FIS/05 - Astronomia e AstrofisicaObservatorylaw0103 physical sciencesAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsgeneral – gravitational lensing; weak – techniques: photometric [quasars]Astrophysics::Galaxy AstrophysicsPhysics010308 nuclear & particles physicsphotometric [Techniques]Astrophysics::Instrumentation and Methods for AstrophysicsAstronomy and AstrophysicsQuasargeneral [Quasars]Spectral bandsSpace and Planetary Scienceastro-ph.COAstrophysics::Earth and Planetary Astrophysicsweak [Gravitational lensing]Astrophysics - Cosmology and Nongalactic Astrophysics
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