SAS-2 gamma-ray observations of PSR 1747-46

Technical Report · Sat May 01 04:00:00 EDT 1976

OSTI ID:7317253

Thompson, D J; Fichtel, C E; Kniffen, D A; Lamb, R C; Oegelman, H B

Observations with the SAS-2 high energy (>35 MeV) gamma-ray telescope show evidence of gamma-ray emission from the radio pulsar PSR 1747-46. When the arrival times of gamma rays from the region of the pulsar were converted to pulsar phases by using the radio period and period derivative, a single peak was found in the phase plot, with a Poisson probability of occurring by chance of .00008. Independently, the time-averaged data for the PSR 1747-46 region show an enhancement over the surrounding region of the sky at the same galactic latitude, with a Poisson probability of chance occurrence of less than .008. The probability that these results are chance is the product of these two probabilities times the number of radio pulsars examined (73). This overall probability is sufficiently small (.00005) to suggest an identification of a new gamma-ray pulsar. In the gamma-ray pulsar plot, the peak falls 0.16 +- 0.03 period after the radio pulsar peak. This phase shift is, within uncertainties, the same as that observed between the single radio peak and the first of the two gamma-ray peaks seen in the phase plot for PSR-0833-45 (the Vela pulsar). (auth)

• Research Organization: National Aeronautics and Space Administration, Greenbelt, MD (USA). Goddard Space Flight Center
• OSTI ID: 7317253
• Report Number(s): N-76-26136; NASA-TM-X-71121; X-662-76-94
• Country of Publication: United States
• Language: English

Related Subjects

640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ENERGY RANGE
GAMMA RADIATION
IONIZING RADIATIONS
MEV RANGE
MEV RANGE 10-100
PHASE SHIFT
PHOTOMETRY
PULSARS
RADIATIONS