Discovery of X-Ray Emission from the Crab Pulsar at Pulse Minimum
Open Access
- 20 June 2001
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 554 (2) , L173-L176
- https://doi.org/10.1086/321718
Abstract
The Chandra X-Ray Observatory observed the Crab pulsar using the Low-Energy Transmission Grating with the High-Resolution Camera. Time-resolved zeroth-order images reveal that the pulsar emits X-rays at all pulse phases. Analysis of the flux at minimum—most likely nonthermal in origin—places an upper limit (T∞ < 2.1 MK) on the surface temperature of the underlying neutron star. In addition, analysis of the pulse profile establishes that the error in the Chandra-determined absolute time is quite small, -0.2 ± 0.1 ms.Keywords
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