Observation of the Vela pulsar, PSR 0833-45, at 0. 2-6. 0 MeV with the FIGARO II experiment

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/185641· OSTI ID:6904874

Sacco, B; Mineo, T; Gerardi, G; Scarsi, L; Agrinier, B ^[1]

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1. CNR, Istituto di Fisica Cosmica con Applicazioni all'Informatica, Palermo (Italy) Palermo Universita (Italy) CEA, Service d'Astrophysique, Gif-sur-Yvette (France)

Results are reported of a 7.75 hr observation of PSR 0833-45 in Vela with FIGARO II (French Italian GAmma Ray Observatory) performed during a balloon flight on November 25, 1988. Two-sigma upper limits for the pulsar flux are given in the gamma-ray energy range 0.2-6.0 MeV. The values are significantly lower than the measured flux obtained by the Riverside experiment as reported by Tumay Tumer et al. in 1984, 31 days after a large glitch in the pulsar period. The FIGARO data also show a departure from the extrapolatian below 50 MeV of the time-averaged flux measured by the COS B satellite, suggesting the existence of a break in the quiescent energy spectrum for values at or obove 5-10 MeV. 7 refs.

• OSTI ID: 6904874
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 349; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASTRONOMY
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ENERGY RANGE
ENERGY SPECTRA
GAMMA ASTRONOMY
GAMMA RADIATION
IONIZING RADIATIONS
LIMITING VALUES
LUMINOSITY
MEV RANGE
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PULSARS
RADIATION FLUX
RADIATIONS
SPECTRA