Radio continuum observations of LMC SNR J0550–6823

 

L. M. Bozzetto,¹ M. D. Filipović,¹ E. J. Crawford,¹ J. L. Payne,¹ A. Y. De Horta,¹ and M. Stupar^2,3

 

¹ School of Computing and Mathematics, University of Western Sydney, Locked Bag 1797, Penrith South DC, NSW 1797, Australia. (luke.bozzetto@gmail.com).

² Department of Physics, Macquarie University, Sydney 2109, NSW, Australia.

³ Australian Astronomical Observatory, Australia.

 

Received 2011 May 20.
Accepted 2011 September 14.

 

RESUMEN

Reportamos nuevas observaciones del remanente de supernova J0550–6823 (DEM L328) en la Nube Mayor de Magallanes, realizadas con el Arreglo Compacto de Telescopios de Australia (ATCA). El objeto es un remanente de supernova típico, en forma de herradura, con un diámetro de 373" × 282"±4" (90 × 68± 1 pc), el cual lo distingue como uno de los más grandes remanentes de supernova en el Grupo Local. Estimamos un índice espectral en radio relativamente alto, α = —0.79±0.27. Sin embargo, la polarización observada (50% ± 10%) es mayor a la esperada y es atípica para remanentes de supernova viejos y evolucionados. Notamos también una fuerte correlación entre [O III] y las imágenes de radio, lo cual permite clasificar a este remanente como dominado por el oxígeno.

 

ABSTRACT

We report on new Australia Telescope Compact Array (ATCA) observations of the Large Magellanic Cloud (LMC) supernova remnant (SNR) J0550–6823 (DEM L328). This object is a typical horseshoe SNR with a diameter of 373" × 282" ± 4" (90 × 68 ± 1 pc), making it one of the largest known SNRs in the Local Group. We estimate a relatively steep radio spectral index of α = —0.79 ± 0.27. However, its stronger than expected polarisation of 50% ± 10% is atypical for older and more evolved SNRs. We also note a strong correlation between [O III] and radio images, classifying this SNR as oxygen dominant.

Key Words: ISM: individual objects (DEM L328, SNR J0550–6823) — ISM: supernova remnants — Magellanic Clouds.

 

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ACKNOWLEDGMENTS

We used the KARMA software package developed by the ATNF. The Australia Telescope Compact Array is part of the Australia Telescope which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. The Magellanic Clouds Emission Line Survey (MCELS) data were provided by R. C. Smith, P. F. Winkler, and S. D. Points. The MCELS project has been supported in part by NSF grants AST-9540747 and AST-0307613, and through the generous support of the Dean B. McLaughlin Fund at the University of Michigan, a bequest from the family of Dr. Dean  B. McLaughlin in memory of his lasting impact on Astronomy. The National Optical Astronomy Observatory is operated by the Association of Universities for Research in Astronomy Inc. (AURA), under a cooperative agreement with the National Science Foundation.

 

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