An 8 day (˜ 175 hours) deep integration at 5 GHz of the prototypical starburst galaxy M82 has provided the most sensitive (to date) high-resolution image of M82 with an angular resolution of 35mas and an rms noise level of 17 mu Jybeam-1. These sub-arcsecond observations detected a number of radio supernovae remnants and have been used to produce detailed images revealing shell and partial shell structures. Additionally, use of an astrometrically aligned image from 36 hour observations in 1992 will enable an effective comparison of the supernova remnants at two epochs (seperated by 10 years). This will allow direct measurement of the expansion velocities of the individual remnants. We present an explanation of the methods to be used to measure the sizes of these supernova remnants and how these will be compared to give expansion velocity measurements.
|Journal||Memorie della Società Astronomica Italiana|
|Publication status||Published - 2005|
- Supernova remnants
- galaxies: individual: M82
- galaxies: starburst
- radio continuum: galaxies.