HEAO 1 A-2 low-energy detector X-ray spectra of the cygnus loop

D. A. Leahy, R. Fink, J. Nousek

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The Cygnus Loop supernova remnant was observed by the A-21 low-energy detector (LED) proportional counters on the HEAO 1 satellite. Recent improvements to the non-X-ray background rejection and detector response simulation have allowed production of the most accurate spectra of the Cygnus Loop to date. Three separate regions of the Cygnus Loop were observed. Single-temperature, Raymond-Smith models are inadequate to describe the spectra, but two component model fits are good. Temperature, column density, and emission measure variations across the Cygnus Loop are found. These results are interpreted and compared with previous work.

Original languageEnglish (US)
Pages (from-to)547-553
Number of pages7
JournalAstrophysical Journal
Issue number2
StatePublished - Nov 10 1990

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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