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NAM2012 - All Presentation Details

Record 306 of 756

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High-resolution, wide-field mapping of supernova remnant Cassiopeiea A in continuum & RRLs (Invited)

Author: Dr. Ashish Asgekar

ASTRON, the Netherlands Institute for Radio Astronomy

Co-Authors: S. Yatawatta (the Netherlands Institute for Radio Astronomy, & Kapteyn Institute, University of Groningen, P.O. Box 800, 9700 AV Groningen, the Netherlands); R. Oonk (the Netherlands Institute for Radio Astronomy,); R. van Weeren (ASTRON, the Netherlands Institute for Radio Astronomy, & Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands)

Session: INS4: LOFAR, the LOw Frequency ARray: Ongoing Developments and Early Results

Presentation type: Talk      12:19  Thursday 29th 11:45-13:15 

Summary:

The LOw Frequency ARray (LOFAR) is a next-generation radio telescope operating at frequencies from 10 to 250 MHz. Along with a large field of view (15 x15 deg) and fractional bandwidths (25-100%), the overall configuration of LOFAR antennas offers high collecting area coupled with > 2000 instantaneous baselines. Such an instrument offers new challenges in calibration and imaging. LOFAR imaging pipeline involves various new strategies, softwares and tools designed to address many of these challenges. We use the pipeline and Sagecal package to calibrate the brightest source in the LOFAR sky, Cassiopeiea A. We present resultant deep, high-resolution maps of this supernova remnant. With the same data we detected Carbon Radio Recombination Lines in absorption towards the supernova remnant. Previously reported lines were detected along with several others elsewhere in our band. These results demonstrate that LOFAR has desired spectral stability and sensitivity to study ionized gas in the Milky Way using RRLs.

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