Discovery of 5.16s pulsations from the isolated neutron star RBS 1223

Details Discovery of 5.16s pulsations from the isolated neutron star RBS 1223 Discovery of 5.16s pulsations from the isolated neutron star RBS 1223

2001-10-16

arxiv.org/abs/astro-ph/0110365v1

Astronomy and Astrophysics

Astrophysics

7 pages, 9 figures, Accepted for publication in Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361:20011425

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 \pm 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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