Preparing for gravitational lens surveys with LOFAR

Colloquium at the Onsala Space Observatory, 12 May 2011

O. Wucknitz

  1. Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany

Abstract

I will give an introduction to (some aspects of) strong gravitational lensing and argue why new large-scale radio surveys for lenses are an important next step. Particularly lensed extended sources provide invaluable information to study galaxies and galaxy evolution. In order to find more such systems, low-frequency radio surveys are the perfect tool, and LOFAR promises to be the right instrument for this endeavour. However, low-frequency interferometry with long baselines is a major challenge. In the second part of the talk I will discuss the efforts that are currently being made for the development and commissioning of international LOFAR. This part of the talk will have a strong bias towards my own interests and my own early LOFAR results.



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download movie 1: single-band delay/rate 3C196 20 Aug 2009, DE-NL
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download movie 2: the Sun with 10 sec integration time per step, real duration ca. 10 min, about 10:16:30 - 10:26:20 on 9-Jun-2010, plays 100 times faster than real-time
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download movie 3: the Sun with 1 sec integration time per step, real duration 30 sec, about 10:17:10 - 10:17:40 on 9-Jun-2010, plays in real-time
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download movie 4: the Sun at 6 frequencies with 10 sec integration time per step, real duration ca. 10 min, about 10:16:55 - 10:26:45 on 9-Jun-2010, plays 10 times faster than real-time
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Script last modified on 7 Sep 2010
Last change to this data base entry on 12 May 2011