X-ray observations of the VELA pulsar - Statistics and spectrum

Details X-ray observations of the VELA pulsar - Statistics and spectrum X-ray observations of the VELA pulsar - Statistics and spectrum

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...208l..67p&link_type=abstract

Astrophysical Journal, vol. 208, Sept. 1, 1976, pt. 2, p. L67-L69.

Astronomy and Astrophysics

Astrophysics

14

Energy Spectra, Pulsars, Stellar Spectra, X Ray Sources, Oso, Photons, Proportional Counters, Satellite-Borne Instruments

Scientific paper

The Vela pulsar (3U 0833-45) was observed in the range 2-60 keV by a proportional-counter experiment on board OSO-8 with temporal resolution sufficient to make possible a sensitive search for pulsed X-rays at the radio pulsar period. A statistical analysis yielded 8 percent as the 3-sigma upper limit on the pulsed fraction. The energy spectrum is fitted well by a structureless power law with number index 2.2 (+ or - 0.2) and absorption by a hydrogen column density of 2.9(+ or - 2.0) by 10 to the 22nd power per sq cm.

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