VLBI long and wide - International LOFAR and
efficient wide-field mapping
Seminar talk at the ICRAR, Perth, 22nd October 2010
O. Wucknitz
- Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany
Abstract
The first part of this talk will present first results from the
international LOFAR array observing at wavelengths in the range 1-10
metres. LOFAR for the first time offers the possibility to image the radio
sky at the longest wavelengths with a resolution in the arcsec range or
better. I will present the first images and discuss particular challenges of
long-baseline LOFAR.
The second part will discuss a simple but extremely efficient method to
image full primary beams with VLBI resolution without the use of
supercomputers. This is made possible by a hierarchic scheme of shifting
and averaging the uv data sets. Compared to standard methods, the
efficiency is increased by orders of magnitude.
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download movie 1: single-band delay/rate 3C196 20 Aug 2009, DE-NL
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download movie 2: coherent multi-band delay/rate 3C196 20 Aug 2009, DE-NL
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download movie 3: incoherent multi-band delay/rate 3C196 Unterweilenbach-Tautenburg
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download movie 4: incoherent all-band delay/rate 3C48 NL-NL with CygA+CasA
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download movie 5: 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 6: 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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Script last modified on 7 Sep 2010
Last change to this data base entry on 4 Nov 2010