We present the results of detailed X-ray analysis of two black-widow pulsars ( BWPs ) , J1446–4701 and J1311–3430 .
PSR J1446–4701 is a BWP with orbital parameters near the median values of the sample of known BWPs .
Its X-ray emission detected by XMM-Newton is well characterized by a soft power-law ( PL ) spectrum ( photon index \Gamma \approx 3 ) , and it shows no significant orbital modulations .
In view of a lack of radio eclipses and an optical non-detection , the system most likely has a low orbital inclination .
PSR J1311–3430 is an extreme BWP with a very compact orbit and the lowest minimum mass companion .
Our Chandra data confirm the hard , \Gamma \approx 1.3 , emission seen in previous observations .
Through phase-restricted spectral analysis , we found a hint ( \sim 2.6 \sigma ) of spectral hardening around pulsar inferior conjunction .
We also provide a uniform analysis of the 12 BWPs observed with Chandra and compare their X-ray properties .
Pulsars with soft , \Gamma > 2.5 , emission seem to have lower than average X-ray and \gamma -ray luminosities .
We do not , however , see any other prominent correlation between the pulsar ’ s X-ray emission characteristics and any of its other properties .
The contribution of the intra-binary shock to the total X-ray emission , if any , is not discernible in this sample of pulsars with shallow observations .