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J/ApJ/709/241 X-rays from pulsars in NGC 6397 (Bogdanov+, 2010)
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Beginning of ReadMe :J/ApJ/709/241 Characterisation of X-rays sources in NGC 6397 (Bogdanov+, 2010)
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A Chandra X-ray observatory study of PSR J1740-5340 and candidate millisecond
pulsars in the globular cluster NGC 6397.
Bogdanov S., van den Berg M., Heinke C.O., Cohn H.N., Lugger P.M.,
Grindlay J.E.
<Astrophys. J., 709, 241-250 (2010)>
=2010ApJ...709..241B
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ADC_Keywords: Clusters, globular ; X-ray sources ; Pulsars
Keywords: globular clusters: general - globular clusters:
individual (NGC 6397) - pulsars: general - pulsars:
individual (PSR J1740-5340) - stars: neutron - X-rays: stars
Abstract:
We present a deep Chandra X-ray Observatory study of the peculiar
binary radio millisecond pulsar (MSP) PSR J1740-5340 and candidate
millisecond pulsars in the globular cluster NGC 6397. The X-rays from
PSR J1740-5340 appear to be non-thermal and exhibit variability at the
binary period. These properties suggest the presence of a relativistic
intrabinary shock formed due to interaction of a relativistic
rotation-powered pulsar wind and outflow from the unusual
"red-straggler/sub-subgiant" companion. We find the X-ray source U18
to show similar X-ray and optical properties to those of
PSR J1740-5340, making it a strong MSP candidate. It exhibits
variability on timescales from hours to years, also consistent with an
intrabinary shock origin of its X-ray emission. The unprecedented
depth of the X-ray data allows us to conduct a complete census of MSPs
in NGC 6397. Based on the properties of the present sample of
X-ray-detected MSPs in the Galaxy, we find that NGC 6397 probably
hosts no more than six MSPs.
Description:
The Chandra data discussed herein were acquired during two separate
observations in Cycle 8, on 2007 June 22 (ObsID 7461) and 2007 July 16
(ObsID 7460) for 90 and 160ks, respectively. We also make use of two
Cycle 3 ACIS-S observations, on 2002 May 13 and 15, for 28.5ks and 27ks
(ObsIDs 2668 and 2669, respectively), and a single Cycle 1 ACIS-I
(ObsID 79) observation of 49ks, on 2000 Jul 31.
For the purposes of optical matching of the X-ray sources using the
set of Hubble Space Telescope Advanced Camera for Surveys Wide-Field
Channel (HST ACS/WFC) observations (GO-10257) in F435W (B), F625W (R),
and F658N (Halpha), we computed a boresight correction for the
Chandra source coordinates (see H. Cohn et al., 2010ApJ...722...20C,
for details).