Query : 2010A&A...510A..67H

2010A&A...510A..67H - Astronomy and Astrophysics, volume 510, A67-67 (2010/2-1)

X-rays from the eclipsing millisecond pulsar PSR J1740-5340 in the globular cluster NGC 6397.


Abstract (from CDS):

The millisecond pulsar PSR J1740-5340 in the globular cluster NGC6397 shows radio eclipses over ∼40% of its binary orbit. A first Chandra observation revealed indications for the X-ray flux being orbit dependent as well. In this work, we analysed five datasets of archival Chandra data taken between 2000 and 2007 to investigate the emission across the pulsar's binary orbit. Utilizing archival Chandra observations of PSR J1740-5340, we performed a systematic timing and spectral analysis of this binary system. Using a χ2-test, the significance for intra-binary orbital modulation was found to be between 88.5% and 99.6%, depending on the number of phase bins used to construct the light curve. Applying the unbiased statistical Kolmogorov-Smirnov (KS) test did not indicate any significant intra-binary orbital modulation. However, comparing the counting rates observed at different epochs, a flux variability on times scales of days to years is indicated. The possible origin of the X-ray emission is discussed in a number of different scenarios.

Abstract Copyright:

Journal keyword(s): pulsars: individual: PSR J1740-5340 - stars: neutron - binaries: eclipsing - globular clusters: individual: NGC 6397 - X-rays: stars

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1940 0
2 PSR J1740-5340 Psr 17 40 44.589 -53 40 40.90   17.43   16.25   ~ 145 2
3 PSR J1959+2048 Psr 19 59 36.7480 +20 48 14.599   20.4       ~ 783 2

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