Computer Science
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phdt.........9f&link_type=abstract
PhD Thesis
Computer Science
Scientific paper
Radio observations of the prototypical starburst galaxy, M82, are presented. These provide the most sensitive, high-resolution observations of the discrete supernova remnants and HII regions in the central starburst to date. In addition, the first ever Global VLBI and MERLIN data combination has produced images of the detailed structure of the compact sources at 1.6 GHz.
MERLIN 5 GHz observations made over a period of 8 days have provided extremely sensitive images of the discrete sources within the M82 starburst with an rms noise level of ~17 microJy/beam. In total 55 of the sources within M82 have been imaged with resolutions of 35-50 milliarcseconds. This has enabled direct comparison with previous MERLIN 5 GHz observations from 1992. As a result, expansion velocities have been measured for ten supernova remnants with values ranging from 1500 to 10500 km/s.
Global VLBI observations at a frequency of 1.6 GHz were performed using sixteen antennas across Europe and America. The combination of these observations with MERLIN 1.6 GHz data has provided the first ever Global VLBI and MERLIN combined image of M82 at this frequency. These data have been used to study the supernova remnants and HII regions using resolutions ranging from 20-130 milliarcseconds.
Both the MERLIN 5 GHz and combined Global VLBI and MERLIN 1.6 GHz observations have been used to study the supernova remnant population, including measurement of the supernova rate and the star formation rate within M82.
The 1.6 GHz Global VLBI data form the most recent epoch of observations used to study the evolution of the most compact sources within M82. Comparison of this and previous epochs covering a 19 year timeline has enabled confirmation of the expansion of the SNR 43.31+59.2, with a velocity of ~8000 km/s, and study of the source 41.95+57.5, showing it to be unique of the sources observed within this galaxy.
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