Long baseline (and other) experiments with LOFAR

Talk presented at Fourth meeting of GLOW in Bochum, 8 July 2010

O. Wucknitz

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

Abstract

I present results from the first 3/4 year of my analysis of LOFAR long baseline observations. Important results are the detection of first fringes to and between all German stations, the analysis of a number of technical issues, the first high-resolution map with the LBA (highest resolution ever achieved in this frequency range) and a preliminary first HBA map with sub-arcsec resolution.
In addition I show my results from first imaging attempts of the Sun. Using only the shorter baselines, I was able to image the Sun in the HBA frequency range with resolutions of arcmins. The maps show the extended disk, slightly larger than the photosphere, and in addition one or two bright and compact activity regions. The latter are very variable in time and frequency as is shown by the dynamic spectra and by movies that show the Sun with a time resolution of 1 sec. Sometimes the active region(s) flare up from one frame to the next, i.e. within one or several seconds.

The image of the Sun is also the JIVE/ASTRON daily image of 22 July 2010. The first long-baseline image appeared there already on 1 June 2010.



download original presentation
PDF file (5.6 MB, last change 9 Jul 2010)
31 pages, suitable for presentation with acroread. This version also includes some hyperlinks for quick navigation and links to references.

download printable version (small)
PDF file (2.7 MB, last change 9 Jul 2010)
Paper saving version. 4 pages, text in b/w, colour figures. 8 slides per A4 page.

download movie 1: single-band delay/rate 3C196 20 Aug 2009, DE-NL
GIF file (700.0 kB, last change 29 Sep 2009)

download movie 2: coherent multi-band delay/rate 3C196 20 Aug 2009, DE-NL
GIF file (1.1 MB, last change 29 Sep 2009)

download movie 3: incoherent multi-band delay/rate 3C196 Unterweilenbach-Tautenburg
MPEG4 movie (8.2 MB, last change 16 Feb 2010)

download movie 4: 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
MPEG4 movie (176.3 kB, last change 8 Jul 2010)

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
MPEG4 movie (129.9 kB, last change 8 Jul 2010)


To publications
To my homepage
To the AIfA
To the University of Bonn

Script last modified on 7 Sep 2010
Last change to this data base entry on 6 Sep 2010