HEAO 3 upper limits to pulsed gamma-ray emission from PSR 1509-58 and PSR 0833-45

M. P. Ulmer*, W. R. Purcell, W. A. Wheaton, W. A. Mahoney

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We report upper limits to the 50 keV-10 MeV gamma-ray pulsations from PSR 1509-58 and PSR 0833-45 (Vela) made with the HEAO 3 gamma-ray spectrometer. The 2 σ upper limit to the 50-300 keV flux from PSR 1509-58 is 6.9 × 10-6 photons cm-2 s-1 keV-1. Combined with the best-fit X-ray spectrum, this limit suggests there is a break in the spectrum below ∼100 keV. This upper limit is not stringent enough, however, to distinguish between thermal and nonthermal models for the source of the X-ray emission. The 2 σ upper limit to the 3.2-10 MeV flux from PSR 0833-45 is 4.9 × 10-8 photons cm-2 s-1 keV-1.

Original languageEnglish (US)
Pages (from-to)485-489
Number of pages5
JournalAstrophysical Journal
Volume369
Issue number2
DOIs
StatePublished - Mar 10 1991

Keywords

  • Gamma rays: bursts
  • Pulsars
  • Stars: individual (PSR 1509-58, PSR 0833-45)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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