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High resolution rapid response observations of compact radio sources with the Ceduna Hobart Interferometer (CHI)


Blanchard, JM and Lovell, JEJ and Ojha, R and Kadler, M and Dickey, JM and Edwards, PG, High resolution rapid response observations of compact radio sources with the Ceduna Hobart Interferometer (CHI), Astronomy & Astrophysics, 538 Article A150. ISSN 0004-6361 (2012) [Refereed Article]


Copyright Statement

Copyright 2012 ESO

DOI: doi:10.1051/0004-6361/201117593


Context: Frequent, simultaneous observations across the electromagnetic spectrum are essential to the study of a range of astrophysical phenomena including active galactic nuclei. A key tool of such studies is the ability to observe an object when it flares i.e. exhibits a rapid and significant increase in its flux density.

Aims: We describe the specific observational procedures and the calibration techniques that have been developed and tested to create a single baseline radio interferometer that can rapidly observe a flaring object. This is the only facility that is dedicated to rapid high resolution radio observations of an object south of −30 degrees declination. An immediate application is to provide rapid contemporaneous radio coverage of AGN flaring at γ-ray frequencies detected by the Fermi Gamma-ray Space Telescope.

Methods: A single baseline interferometer, the Ceduna Hobart Interferometer (CHI), was formed with radio telescopes in Hobart, Tasmania and Ceduna, South Australia. A software correlator was set up at the University of Tasmania to correlate these data.

Results: Measurements of the flux densities of flaring objects can be made using our observing strategy within half an hour of a triggering event. These observations can be calibrated with amplitude errors better than 15%. Lower limits to the brightness temperatures of the sources can also be calculated using CHI.

Item Details

Item Type:Refereed Article
Keywords:instrumentation: interferometers; galaxies: jets; quasars: general; galaxies: active; galaxies: nuclei; gamma rays: galaxies
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Astronomical sciences not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Blanchard, JM (Mr Jay Blanchard)
UTAS Author:Lovell, JEJ (Dr Jim Lovell)
UTAS Author:Dickey, JM (Professor John Dickey)
ID Code:78627
Year Published:2012
Web of Science® Times Cited:3
Deposited By:Mathematics and Physics
Deposited On:2012-07-10
Last Modified:2018-03-28
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