ROSAT observations of the binary millisecond pulsar PSR J0751+1807
Abstract
We report the discovery of the binary millisecond pulsar PSR J0751+1807 in the soft X-ray domain with ROSAT. The low number of source counts does not allow a detailed spectral modelling. Assuming an energy spectrum similar to that of PSR J0437-4715 implies, for the pulsar X-ray flux, f_x~1x10^-13 erg s^-1 cm^-2 within the 0.1-2.4 keV energy range. This corresponds to an X-ray luminosity of L_x~4.7x10^31 erg s^-1 if we adopt the dispersion measure based pulsar distance of 2 kpc. A photon arrival time analysis does not reveal significant X-ray pulses. A sine-wave fit to the folded light curve results in a 2sigma pulsed fraction upper limit of 35 per cent.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- October 1996
- DOI:
- 10.1093/mnras/282.3.L33
- Bibcode:
- 1996MNRAS.282L..33B
- Keywords:
-
- BINARIES: GENERAL;
- STARS: INDIVIDUAL: RX J075109.7+180736;
- STARS: NEUTRON;
- PULSARS: INDIVIDUAL: PSR J0751+1807;
- X-RAYS: GENERAL