BeppoSAX observations of the three Gamma-ray pulsars PSR B0656+14, PSR B1055-52 and PSR B1706-44

¹ Istituto di Astrofisica Spaziale e Fisica Cosmica, CNR, Sezione di Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy
² Dipartimento di Fisica, Universitá La Sapienza, Piazzale A. Moro 2, 00185 Roma, Italy
³ Istituto di Astrofisica Spaziale e Fisica Cosmica, CNR, Sezione di Roma, Via Fosso del Cavaliere, 00113 Roma, Italy
⁴ Max-Planck-Institut für Extraterrestrische Physik, 85740 Garching-bei-München, Germany

Corresponding author: T. Mineo, mineo@pa.iasf.cnr.it

Received: 20 March 2002
Accepted: 4 June 2002

Abstract

We report the results of the observations of the three γ-ray pulsars PSR B0656+14, PSR B1055-52 and PSR B1706-44 performed with BeppoSAX. We detected a pulsed emission only for PSR B1055-52: in the range 0.1–6.5 keV the pulse profile is sinusoidal and the statistical significance is . The pulsed fraction was estimated . This pulsation was detected also at energies greater than 2.5 keV suggesting either a non-thermal origin or a quite high temperature region on the neutron star surface. Spectral analysis showed that only the X-ray spectrum of PSR B1706-44 can be fitted by a single power–law component, while that of PSR B1055-52 requires also a blackbody component ( keV) and that of PSR B0656+14 two blackbody components (,  keV).