The Hubble constant estimation using 18 gravitational lensing time delays
| Autor: | Anton T. Jaelani, Premana Premadi |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Physics
Mass distribution business.industry Strong gravitational lensing Mathematical analysis Physics::Optics Astrophysics::Cosmology and Extragalactic Astrophysics Redshift law.invention Lens (optics) symbols.namesake Gravitational lens Optics Position (vector) law symbols business Linear equation Hubble's law |
| Zdroj: | AIP Conference Proceedings. |
| ISSN: | 0094-243X |
| DOI: | 10.1063/1.4868751 |
| Popis: | Gravitational lens time delay method has been used to estimate the rate of cosmological expansion, called the Hubble constant, H0, independently of the standard candle method. This gravitational lensing method requires a good knowledge of the lens mass distribution, reconstructed using the lens image properties. The observed positions of the images, and the redshifts of the lens and the images serve as strong constraints to the lens equations, which are then solved as a set of simultaneous linear equations. Here we made use of a non-parametric technique to reconstruct the lens mass distribution, which is manifested in a linear equations solver named PixeLens. Input for the calculation is chosen based on prior known parameters obtained from analyzed result of the lens case observations, including time-delay, position angles of the images and the lens, and their redshifts. In this project, 18 fairly well studied lens cases are further grouped according to a number of common properties to examine how each pr... |
| Databáze: | OpenAIRE |
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