W. Becker and J. Trumper, Max-Planck-Institut fur Extraterrestrische Physik, report: "We have detected the isolated galactic millisecond pulsar PSR J1024-0719 in the energy range 0.1-2.4 keV with ROSAT. The source was observed with the High Resolution Imager (HRI) from 1997 Nov. 17 to Dec. 7 for a total exposure time of 80~635 s. The net countrate (including background, vignetting and dead-time corrections) is (3.3 +/- 0.3) x 10E-4 counts/s. Assuming a Crab-like spectrum and a column absorption of N_H = 2 x 10E20 cmE-2, deduced from the radio dispersion measure (cf. Bailes et al. 1997, Ap.J. 481, 386), we find an energy flux of 2 x 10E-14 erg sE-1 cmE-2 over 0.1-2.4 keV. The low number of recorded source counts precluded any modulation testing at the 5.15-ms radio period."
International Astronomical Union Circular
- Pub Date:
- March 1998