Observation of A0535 + 26 at energies above 150 keV with the FIGARO II experiment

Details Observation of A0535 + 26 at energies above 150 keV with the FIGARO II experiment Observation of A0535 + 26 at energies above 150 keV with the FIGARO II experiment

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...398l.103c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 398, no. 2, p. L103-L106.

Astronomy and Astrophysics

Astronomy

3

Gamma Ray Astronomy, Gamma Ray Observatory, Light Curve, X Ray Stars, Balloon-Borne Instruments, Cyclotron Radiation, Energy Spectra

Scientific paper

The transient pulsating X-ray source A0535 + 26 was observed by the FIGARO II gamma-ray experiment on 1990 July 9. The periodogram of about 6 hr of data shows only one significant signal (3.5 sigma) at the period of 103.2 s, very close to the expected one. The folded light curve is characterized by a double-peak structure and a narrow dip; it is similar to that at lower energies. The pulsed flux is (8.6 +/- 2.3) x 10 exp -6 photons/sq cm/s/keV in the 148-260 keV band. We also find evidence of a low-energy cutoff below 167 keV.

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