A Deep Search for Pulsations from the Nearby Isolated Neutron Star RX J1856.5-3754

Details A Deep Search for Pulsations from the Nearby Isolated Neutron Star RX J1856.5-3754 A Deep Search for Pulsations from the Nearby Isolated Neutron Star RX J1856.5-3754

2001-11-16

arxiv.org/abs/astro-ph/0111339v3

Astrophys.J. 570 (2002) L75-L78

Astronomy and Astrophysics

Astrophysics

Accepted by ApJ Letters 2002 April 1

Scientific paper

10.1086/340973

We present the results of a deep search for pulsations from the nearby isolated neutron star RX J1856.5-3754 using the 450 ks Director's Discretionary Time Chandra observation completed on 2001 Oct 15. No pulsations were detected. We find a 99% confidence upper limit on the pulsed fraction of ~4.5% for worst-case sinusoidal pulsations with frequency <~50 Hz and frequency derivatives -5x10^-10 <= f-dot <= 0 Hz/s. The non-detection of pulsations is most likely due to an unfavorable viewing angle or emitting geometry. Such emitting geometries are much more likely to occur for more ``compact'' neutron stars which show increased gravitational light-bending effects. In this case, the non-detection implies a radius/mass ratio for RX J1856.5-3754 of R/M <~10 km/Msun.

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