Discovery of x-ray emission associated with the gum nebula

D. A. Leahy, J. Nousek, G. Garmire

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9 Scopus citations


The Gum Nebula was observed by the A-21 LED proportional counters on the HEAO-1 satellite as part of the all-sky survey. We report the first detection of X-ray emission associated with the Gum Nebula. Soft X-ray spectra were constructed from the A-2 LED PHA data. Single temperature Raymond-Smith models were fitted to the observed spectra to yield temperature, column density and emission measure. The temperature is ≈6 × 105 K, the column density ≈4 x 1020 cm-2, and the emission measure ≪5 cm-6 pc. The X-ray and optical properties of the Gum Nebula are consistent with a supernova remnant in the shell stage of evolution, which was the product of an energetic (3 × 1051 ergs) supernova explosion which occurred about 2 × 106 yr ago.

Original languageEnglish (US)
Pages (from-to)561-566
Number of pages6
JournalAstrophysical Journal
Issue number2
StatePublished - Feb 1 1992

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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