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(-6) photons cm-2 s-1 keV-1 in the 148-260 keV band. We also find evidence of a low-energy cutoff below 167 keV.

Cusumano, G., Mineo, T., Sacco, B., Scarsi, L., Gerardi, G., Agrinier, B., et al. (1992). OBSERVATION OF A0535+26 AT ENERGIES ABOVE 150 KEV WITH THE FIGARO-II EXPERIMENT. THE ASTROPHYSICAL JOURNAL, 398(2), L103-L106 [10.1086/186587].

OBSERVATION OF A0535+26 AT ENERGIES ABOVE 150 KEV WITH THE FIGARO-II EXPERIMENT

MATT, Giorgio;
1992-01-01

Abstract

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(-6) photons cm-2 s-1 keV-1 in the 148-260 keV band. We also find evidence of a low-energy cutoff below 167 keV.
1992
Cusumano, G., Mineo, T., Sacco, B., Scarsi, L., Gerardi, G., Agrinier, B., et al. (1992). OBSERVATION OF A0535+26 AT ENERGIES ABOVE 150 KEV WITH THE FIGARO-II EXPERIMENT. THE ASTROPHYSICAL JOURNAL, 398(2), L103-L106 [10.1086/186587].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/121971
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