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.

arXiv commentpublished

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• AstroSat Observations of the first Galactic ULX Pulsar Swift J0243.6+6124
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• X-ray emission evolution of the Galactic ultra-luminous X-ray pulsar Swift J0243.6+6124 during the 2017-2018 outburst observed by the MAXI GSC
• Exploring the nature of ultra-luminous X-ray sources across stellar population ages using detailed binary evolution calculations
• Timing and Spectral Studies of the X-ray Pulsar 2S 1417$-$624 During the Outburst in 2021
• Unveiling the origin of the optical/UV emission from the Galactic ULX Swift J0243.6+6124 during its 2017-2018 giant outburst
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