Long-slit optical spectroscopy of Large Magellanic Cloud radio supernova remnants

Details Long-slit optical spectroscopy of Large Magellanic Cloud radio supernova remnants Long-slit optical spectroscopy of Large Magellanic Cloud radio supernova remnants

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mnras.383.1175p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 383, Issue 3, pp. 1175-1194.

Astronomy and Astrophysics

Astronomy

16

Supernova Remnants, Magellanic Clouds

Scientific paper

We use long-slit spectra from shocked regions of radio supernova remnants (SNRs) in the Large Magellanic Cloud to estimate electron density and derive an average `metal' abundance of 10-3.9 based on diagnostic line ratio plots. These simple diagnostics may be especially useful to determine abundances in more distant galaxies. Abundance values listed in this paper, in units of log(x/H)+12, for nitrogen (7.3) and oxygen (8.2) agree with those reported in the literature. These estimates - which we assume to be dominated by the interstellar medium with little evolutionary interference - were obtained from spectral analysis of ~50 per cent of known radio SNRs using the double beam spectrograph on the 2.3-m Advanced Technology Telescope at Siding Spring Observatory in Australia and the Cassegrain spectrograph on the 1.9-m Radcliffe telescope at the South African Astronomical Observatory. We also found optical evidence of shocked regions near 2 of 20 radio SNR candidates (J053620-693136 and J053731-662740), strengthening their identification as true remnants.

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