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Title: Detection of a cyclotron line in SXP 15.3 during its 2017 outburst
Other Titles: G Vasilopoulos
Authors: Maitra, Chandreyee
Paul, Biswajit
Haberl, F
Vasilopoulos, G
Keywords: stars: neutron
pulsars: individual: SMC
galaxies: individual: SXP 15.3
X-rays: binaries
Issue Date: 11-Oct-2018
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2018, Vol. 480, pL136-L140
Abstract: We report the results of AstroSat and NuSTAR observations of the Be/X-ray binary pulsar SXP 15.3 in the Small Magellanic Cloud during its outburst in late 2017, when the source reached a luminosity level of ˜1038 erg s-1, close to the Eddington limit. The unprecedented broad-band coverage of the source allowed us to perform timing and spectral analysis between 3 and 80 keV. The pulse profile exhibits a significant energy dependence, and morphs from a double-peaked profile to a single broad pulse at energies >15 keV. This can be explained by a spectral hardening during an intensity dip seen between the two peaks of the pulse profile. We detect a Cyclotron Resonance Scattering Feature at ˜5 keV in the X-ray spectrum, independent of the choice of the continuum model. This indicates a magnetic field strength of 6 × 1011 G for the neutron star.
Description: Open Access
ISSN: 0035-8711
1365-2966 - (online)
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Copyright: 2018 The Author(s)
Appears in Collections:Research Papers (A&A)

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