Astrophys. J., 847, 26-26 (2017/September-3)
Deep Chandra survey of the Small Magellanic Cloud. II. Timing analysis of X-ray pulsars.
HONG J., ANTONIOU V., ZEZAS A., HABERL F., SASAKI M., DRAKE J.J., PLUCINSKY P.P. and LAYCOCK S.
Abstract (from CDS):
We report the timing analysis results of X-ray pulsars from a recent deep Chandra survey of the Small Magellanic Cloud (SMC). We analyzed a total exposure of 1.4 Ms from 31 observations over a 1.2 deg2 region in the SMC under a Chandra X-ray Visionary Program. Using the Lomb-Scargle and epoch-folding techniques, we detected periodic modulations from 20 pulsars and a new candidate pulsar. The survey also covered 11 other pulsars with no clear sign of periodic modulation. The 0.5-8 keV X-ray luminosity (LX) of the pulsars ranges from 1034 to 1037 erg s–1 at 60 kpc. All of the Chandra sources with LX >= 4 x 1035 erg s–1 exhibit X-ray pulsations. The X-ray spectra of the SMC pulsars (and high-mass X-ray binaries) are in general harder than those of the SMC field population. All but SXP 8.02 can be fitted by an absorbed power-law model with a photon index of Γ <= 1.5. The X-ray spectrum of the known magnetar SXP 8.02 is better fitted with a two-temperature blackbody model. Newly measured pulsation periods of SXP 51.0, SXP 214, and SXP 701, are significantly different from the previous XMM-Newton and RXTE measurements. This survey provides a rich data set for energy-dependent pulse profile modeling. Six pulsars show an almost eclipse-like dip in the pulse profile. Phase-resolved spectral analysis reveals diverse spectral variations during pulsation cycles: e.g., for an absorbed power-law model, some exhibit an (anti)-correlation between absorption and X-ray flux, while others show more intrinsic spectral variation (i.e., changes in photon indices).
© 2017. The American Astronomical Society. All rights reserved.
Magellanic Clouds - pulsars: general - stars: neutron - X-rays: binaries - X-rays: binaries
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