Computer Science
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atnf.prop.2072l&link_type=abstract
ATNF proposal V209, Semester: April, 2009
Computer Science
Extragalactic, Lba
Scientific paper
We request LBA time to continue multi-epoch observations of compact radio sources in the nearby starburst galaxies NGC 253 and NGC 4945. We will search for new supernova remnants and monitor the structure and evolution of existing remnants to improve estimates of the nuclear supernova rate and star formation rate. The sensitivity and resolution provided by these observations will enable us to estimate and determine both upper and lower limits on these rates using a number of independent methods. From models we have generated to estimate the supernova rate and star formation rate in the NGC 253 starburst, it is clear that frequent, high sensitivity monitoring is required to maximise the chances of detecting remnants whose light curves peak briefly above the detection limits of VLBI images. For NGC 4945 we request observations at multiple bands to improve spectral models of sources detected at 2.3 GHz with the LBA and at 17-23 GHz with the ATCA. Our observations will also enable a study of the jet-like source we discovered in our first epoch observations of NGC 4945 by measuring the spectral index of the source and motion in the jet components.
Argo Megan
Lenc Emil
Tingay Steven
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