G306.3-0.9: A newly discovered young galactic supernova remnant

Mark T. Reynolds, Shyeh T. Loi, Tara Murphy, Jon M. Miller, Dipankar Maitra, Kayhan Gültekin, Neil Gehrels, Jamie A. Kennea, Michael H. Siegel, Jonathan Gelbord, Paul Kuin, Vanessa Moss, Sarah Reeves, William J. Robbins, B. M. Gaensler, Rubens C. Reis, Robert Petre

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Abstract

We present X-ray and radio observations of the new Galactic supernova remnant (SNR) G306.3-0.9, recently discovered by Swift. Chandra imaging reveals a complex morphology, dominated by a bright shock. The X-ray spectrum is broadly consistent with a young SNR in the Sedov phase, implying an age of 2500 yr for a distance of 8 kpc, plausibly identifying this as one of the 20 youngest Galactic SNRs. Australia Telescope Compact Array imaging reveals a prominent ridge of radio emission that correlates with the X-ray emission. We find a flux density of 160 mJy at 1 GHz, which is the lowest radio flux recorded for a Galactic SNR to date. The remnant is also detected at 24 μm, indicating the presence of irradiated warm dust. The data reveal no compelling evidence for the presence of a compact stellar remnant.

Original languageEnglish (US)
Article number112
JournalAstrophysical Journal
Volume766
Issue number2
DOIs
StatePublished - Apr 1 2013

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Reynolds, M. T., Loi, S. T., Murphy, T., Miller, J. M., Maitra, D., Gültekin, K., Gehrels, N., Kennea, J. A., Siegel, M. H., Gelbord, J., Kuin, P., Moss, V., Reeves, S., Robbins, W. J., Gaensler, B. M., Reis, R. C., & Petre, R. (2013). G306.3-0.9: A newly discovered young galactic supernova remnant. Astrophysical Journal, 766(2), [112]. https://doi.org/10.1088/0004-637X/766/2/112