Rosat Observations of the Radio and Gamma-ray Pulsar Psr 1706-44 Rosat Observations of the Radio and Gamma-ray Pulsar Psr 1706-44
نویسنده
چکیده
We report on the detection of PSR 1706-44 in two ROSAT-PSPC observations. The recorded source counts are unpulsed with a 2 pulsed fraction upper limit of 18%. Spectral analysis did not distinguish between black-body and power law models; however, we argue that the lack of pulsations and the similarity in the pulsar's spin parameters to those of the Vela pulsar favour a power law model dN=dE / E 2:40:6 and indicate synchrotron emission from a pulsar-powered nebula as the origin of the detected X-radiation. The X-ray ux derived for the power law model is f x = 3:2 +6:5 1:8 10 12 erg=s=cm 2 within the 0:1{2:4 keV energy range. An upper limit for the neutron star's surface temperature is put at logT 1 s 6:03 K for a neutron star with a medium stii equation of state (FP-model with M = 1:4 M , R = 10:85 km). Slightly diierent values for T 1 s are computed for the various neutron star models available in the literature, reeecting the diierence in the equation of state. No soft X-ray emission is detected from the supernova remnant G343.1-2.3, proposed to be associated with PSR 1706-44.
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