Discovery of 5.16s pulsations from the isolated neutron star RBS 1223
Abstract
The isolated neutron star candidate RBS 1223 was observed with the Advanced CCD Imaging Spectrometer aboard the Chandra X-ray observatory on 2000 June 24. A timing analysis of the data yielded a periodic modulation with a period P=5.1571696(+1.57*10(-4) -1.36*10(-4)s. Using ROSAT HRI archived observations we detected a period P=5.1561274 4.4*10(-4)s and determined period derivative dP/dt=(0.7 - 2.0)*10(-11) s*s(-1). The detection of this period and dP/dt indicates that RBS 12223 has a ``characteristic'' age of 6000-12000 years and huge magnetic field at the surface (B(dipole)~(1.7- 3.2)*10(+14) G) typical for anomalous X-ray pulsars (AXPs).
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