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

Journal Article · Fri Mar 01 00:00:00 EST 1991 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/169778· OSTI ID:5757438

Ulmer, M P; Purcell, W R; Wheaton, W A; Mahoney, W A ^[1]

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1. Northwestern Univ., Evanston, IL (USA) JPL, Pasadena, CA (USA)

This paper reports 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 sigma upper limit to the 50 - 300 keV flux from PSR 1509 - 58 is 6.9 x 10 to the -6th photons/sq cm per sec per keV. Combined with the best-fit X-ray spectrum, this limit suggests there is a break in the spectrum below about 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 sigma upper limit to the 3.2 - 10 MeV flux from PSR 0833 - 45 is 4.9 x 10 to the -8th photons/sq cm per sec per keV. 28 refs.

• OSTI ID: 5757438
• Journal Information: Astrophysical Journal; (USA), Vol. 369; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
PULSARS
GAMMA RADIATION
COSMIC GAMMA BURSTS
GAMMA SPECTROMETERS
LIMITING VALUES
MAGNETIC FIELDS
PULSATIONS
SIGNAL-TO-NOISE RATIO
X-RAY SPECTRA
COSMIC RADIATION
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
MEASURING INSTRUMENTS
PRIMARY COSMIC RADIATION
RADIATIONS
SPECTRA
SPECTROMETERS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources