Discovery of X-ray pulsations in the Be/X-ray binary IGR J21343+4738

Abstract

We report on the discovery of X-ray pulsations in the Be/X-ray binary IGR J21343+4738 during an XMM-Newton observation. We obtained a barycentric corrected pulse period of 320.35+-0.06 seconds. The pulse profile displays a peak at low energy that flattens at high energy. The pulse fraction is 45+-3$% and independent of energy within the statistical uncertainties. The 0.2-12 keV spectrum is well fit by a two component model consisting of a blackbody with kT=0.11+-0.01 keV and a power law with photon index Gamma=1.02+-0.07. Both components are affected by photoelectric absorption with a equivalent hydrogen column density NH=(1.08+-0.15)x 10^{22} cm^{-2} The observed unabsorbed flux is 1.4x10^{-11} erg cm^{-2} s^{-1} in the 0.2-12 keV energy band. Despite the fact that the Be star's circumstellar disc has almost vanished, accretion continues to be the main source of high energy radiation. We argue that the observed X-ray luminosity (LX~10^{35} erg s^{-1}) may result from accretion via a low-velocity equatorial wind from the optical companion.

arXiv comment7 pages, 5 figures, 2 tables. Accepted for publication in MNRAS

References in corpus (35)

• The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
• The XMM-Newton Optical/UV Monitor Telescope
• Be/X-ray binaries
• The 3rd IBIS/ISGRI soft gamma-ray survey catalog
• A New Class of High-Mass X-ray Binaries: Implications for Core Collapse and Neutron-Star Recoil
• Origin of the Soft Excess in X-ray Pulsars
• INTEGRAL/IBIS all-sky survey in hard X-rays
• Discovery of two new persistent Be/X-ray pulsar systems
• Patterns of variability in Be/X-ray pulsars during giant outbursts
• Cross-calibration of the X-ray Instruments onboard the Chandra, INTEGRAL, RXTE, Suzaku, Swift, and XMM-Newton Observatories using G21.5-0.9
• Completing the puzzle of the 2004-2005 outburst in V0332+53: the brightening phase included
• The quiescent X-ray emission of three transient X-ray pulsars
• No anti-correlation between cyclotron line energy and X-ray flux in 4U 0115+634
• Identification of the optical counterparts of high-mass X-ray binaries through optical photometry and spectroscopy
• RX J0440.9+4431: a persistent Be/X-ray binary in outburst
• Discovery of the Orbit of the Transient X ray Pulsar SAX J2103.5+4545
• X-ray properties of the transient pulsar 3A 0535+262 in quiescence
• XMM-Newton observation of the Be/neutron star system RX J0146.9+6121: a soft X-ray excess in a low luminosity accreting pulsar
• Energy-Dependent Harmonic Ratios of the Cyclotron Features of X0331+53 in the 2004-2005 Outburst
• XMM-Newton observation of the persistent Be/neutron-star system X Persei at a high-luminosity level
• Timing Studies on RXTE Observations of SAX J2103.5+4545
• XMM-Newton observations of 1A 0535+262 in quiescence
• Discovery of heavily-obscured AGN among 7 INTEGRAL hard X-ray sources observed by Chandra
• Finding a 24-day orbital period for the X-ray binary 1A 1118-616
• The Be/X-ray transient KS 1947+300
• Optical Identifications of Five INTEGRAL Hard X-ray Sources in the Galactic Plane Region
• Cyclotron Resonance Energies and Orbital Elements of Accretion Pulsar 4U 0115+63 During the Giant Outburst in 2008
• Discovery of 47-s pulsations in the X-ray source 1RXS J225352.8+624354
• XMM-Newton observation of the persistent Be/NS X-ray binary pulsar RX J1037.5-5647 in a low luminosity state
• Correlated optical/X-ray variability in the high-mass X-ray binary SAX J2103.5+4545
• The discovery of the optical/IR counterpart of the 12s transient X-ray pulsar GS 0834-43
• Long-term pulse profile study of the Be/X-ray pulsar SAX J2103.5+4545
• A large spin-up rate measured with INTEGRAL in the High Mass X-ray Binary Pulsar SAXJ2103.5+4545
• INTEGRAL observations of the peculiar BeX System SAX J2103.5+4545
• Optical and X-ray Outbursts of Be/X-ray binary system SAX J2103.5+4545

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