Hard X-ray observations of the Crab Nebula and A0535+26 with a high energy resolution spectrometer

Details Hard X-ray observations of the Crab Nebula and A0535+26 with a high energy resolution spectrometer Hard X-ray observations of the Crab Nebula and A0535+26 with a high energy resolution spectrometer

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..144h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 1, 1983, p. 144-149.

Astronomy and Astrophysics

Astrophysics

27

Astronomical Spectroscopy, Crab Nebula, X Ray Sources, Balloon Flight, Data Reduction, Light Curve, Pulsars

Scientific paper

X-ray observations of the Crab and the transient source A0535 +26 in the energy range 20-800 keV were conducted from a high-energy resolution balloon-borne experiment on 1980 September 25. After the deconvolution of these two sources, the spectrum of A0535 was fitted by a power law with index -3.42 ± 0.12 and by an exponential law, yielding a temperature kT = 17.7 ± 0.9 keV. Pulsations at a period of 103.79 s and with a double-peaked light curve were also observed. No feature at 73 or 400 keV was observed in the Crab spectrum with 3 σ upper limits of 6.2 × 10-4 photons cm-2 s-1 (73 keV) and 1.7 × 1O-3 photons s-1 (400 keV).

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