Insight-HXMT observations of Swift J0243.6+6124 during its 2017-2018 outburst

Abstract

The recently discovered neutron star transient Swift J0243.6+6124 has been monitored by {\it the Hard X-ray Modulation Telescope} ({\it Insight-\rm HXMT). Based on the obtained data, we investigate the broadband spectrum of the source throughout the outburst. We estimate the broadband flux of the source and search for possible cyclotron line in the broadband spectrum. No evidence of line-like features is, however, found up to $150\mathrm{keV}$. In the absence of any cyclotron line in its energy spectrum, we estimate the magnetic field of the source based on the observed spin evolution of the neutron star by applying two accretion torque models. In both cases, we get consistent results with $B\sim 10^{13}\mathrm{G}$, $D\sim 6\mathrm{kpc}$ and peak luminosity of $>10^{39}\mathrm{erg}{\mathrm{s}}^{-1}$ which makes the source the first Galactic ultraluminous X-ray source hosting a neutron star.

published

References in corpus (3)

• Super-Eddington accretion onto the Galactic ultraluminous X-ray pulsar Swift J0243.6+6124
• Insight-HXMT observations of 4U~1636-536: Corona cooling revealed with single short type-I X-ray burst
• Understanding the spectral and timing behavior of a newly discovered transient X-ray pulsar Swift J0243.6+6124

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