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dc.contributor.authorRampadarath, Hayden
dc.contributor.authorMorgan, John
dc.contributor.authorLenc, E.
dc.contributor.authorTingay, Steven
dc.date.accessioned2017-01-30T13:56:06Z
dc.date.available2017-01-30T13:56:06Z
dc.date.created2014-01-28T20:01:02Z
dc.date.issued2014
dc.identifier.citationRampadarath, H. and Morgan, J.S. and Lenc, E. and Tingay, S.J. 2014. Multi-epoch very long baseline interferometric observations of the nuclear starburst region of NGC 253: Improved modelling of the supernova and star-formation rates. Astronomical Journal. 147 (1): pp. 1-18.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/36509
dc.identifier.doi10.1088/0004-6256/147/1/5
dc.description.abstract

The results of multi-epoch observations of the southern starburst galaxy, NGC 253, with the Australian Long Baseline Array (LBA) at 2.3 GHz are presented. As with previous radio interferometric observations of this galaxy, no new sources were discovered. By combining the results of this survey with Very Large Array observations at higher frequencies from the literature, spectra were derived and a free-free absorption model was fitted of 20 known sources in NGC 253. The results were found to be consistent with previous studies. The supernova remnant, 5.48−43.3, was imaged with the highest sensitivity and resolution to date, revealing a two-lobed morphology. Comparisons with previous observations of similar resolution give an upper limit of 104 km s−1 for the expansion speed of this remnant. We derive a supernova rate of <0.2 yr−1 for the inner 300 pc using a model that improves on previous methods by incorporating an improved radio supernova peak luminosity distribution and by making use of multi-wavelength radio data spanning 21 years. A star formation rate of SFR(M ≥ 5 M) < 4.9 M yr−1 was also estimated using the standard relation between supernova and star-formation rates. Our improved estimates of supernova and star-formation rates are consistent with studies at other wavelengths. The results of our study point to the possible existence of a small population of undetected supernova remnants, suggesting a low rate of radio supernovae production in NGC 253.

dc.publisherIOP
dc.subjectISM: supernova remnants
dc.subjectsupernovae: general
dc.subjectRadio continuum: galaxies
dc.subjectTechniques: interferometric
dc.subjectstarburst: galaxies
dc.subjectindividual - (NGC 253)
dc.titleMulti-epoch very long baseline interferometric observations of the nuclear starburst region of NGC 253: Improved modelling of the supernova and star-formation rates
dc.typeJournal Article
dcterms.source.volume147
dcterms.source.number1
dcterms.source.startPage1
dcterms.source.endPage18
dcterms.source.issn0004-6256
dcterms.source.titleAstronomical Journal
curtin.note

Copyright © 2014 The American Astronomical Society

curtin.department
curtin.accessStatusOpen access


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