Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.333..603h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 333, Issue 3, pp. 603-612.
Astronomy and Astrophysics
Astronomy
12
Pulsars: Individual: Psr B0540-69 Ism: Individual: Snr 0540-693 Supernova Remnants, X-Rays: Individual: Psr B0540-69 X-Rays: Stars, Pulsars: Individual: Psr B0540-69, Ism: Individual: Snr 0540-693, Supernova Remnants, X-Rays: Individual: Psr B0540-69, X-Rays: Stars
Scientific paper
The ASCA satellite has observed the 50-ms pulsar PSR B0540-69 and its associated supernova remnant SNR 0540-693 in the Large Magellanic Cloud 15 times in total, at least once a year, between 1993 June and 1999 November, including six observations with the pulsar as the main target. In all the observations, a point-like X-ray source was clearly detected at the position of PSR B0540-69 and the X-ray pulsations were detected at large significance. Folded light curves are identical throughout the observations, showing one broad pulse with a small notch at the top. Pulse frequency history during the 6.4yr of the ASCA observations is well characterized by a second-order polynomial with a breaking index of 2.10+/-0.05, assuming no glitches occurred during the period. The frequency history smoothly follows the Ginga and ROSAT results and connects to the RXTE results without a measurable discontinuity. The X-ray spectrum of the whole source is well represented by a single power-law model of photon index, α=2.00+/-0.02, and a small photoelectric absorption, NH=(4.3+/-0.2)×1021cm-2. The X-ray spectrum can also be represented by a pulsed power-law spectrum with photon index of 1.80+/-0.05 with 24 per cent in amplitude at 1keV, embedded in a constant power-law component with photon index of 2.17+/-0.02 ascribed to a nebular component. Spectral properties of the X-ray emission from the pulsar and the nebula remain unchanged over the six years and are quite similar to those of the Crab pulsar and nebula.
Endo Tomoki
Hirayama Masaharu
Itoh Makoto
Kawai Nobuyuki
Nagase Fumiaki
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