Searching for the highest energy of pulsation and critical luminosity of Swift J0243.6+6124 observed by Insight-HXMT
arXiv:2405.17803 · doi:10.1088/1674-4527/ad3902
Abstract
Owing to the broad energy coverage of Insight-HXMT in the hard X-ray band, we detected the highest energy of pulsation exceeding 200 keV around the 2017-2018 outburst peak of the first Galactic pulsating ultraluminous X-ray source (PULX) Swift J0243.6+6124, which is the highest energy detected from PULXs to date. We also obtained the highest energy of pulsation of every exposure during the outburst in 2017-2018, and found the highest energy is roughly positively correlated with luminosity. Using our newly developed method, we identified the critical luminosity being when the main peaks of the low and high energy pulse profiles became aligned, which separates the fan-beam dominated and pencil-beam dominated accretion regimes. Above the critical luminosity, the phase of the main peak shifted gradually from 0.5 to 0.8 until the outburst peak in all energy bands is reached, which is in agreement with the phase shift found previously at low energies. Our result is consistent with what is derived from spectral analysis.
arXiv comment9 pages, 9 figures, published in RAA
References in corpus (31)
- An Ultraluminous X-ray Source Powered by An Accreting Neutron Star
- Be/X-ray binaries
- An accreting pulsar with extreme properties drives an ultraluminous x-ray source in NGC 5907
- Discovery of a 0.42-s pulsar in the ultraluminous X-ray source NGC 7793 P13
- Discovery of coherent pulsations from the Ultraluminous X-ray Source NGC 7793 P13
- Overview to the Hard X-ray Modulation Telescope (Insight-HXMT) Satellite
- Discovery of pulsations from NGC 300 ULX1 and its fast period evolution
- Spectral Formation in Accreting X-Ray Pulsars: Bimodal Variation of the Cyclotron Energy with Luminosity
- The critical accretion luminosity for magnetized neutron stars
- The Medium Energy (ME) X-ray telescope onboard the Insight-HXMT astronomy satellite
- Discovery of a 2.8 s pulsar in a 2 d orbit High-Mass X-ray Binary powering the Ultraluminous X-ray source ULX-7 in M51
- Ultraluminous X-ray sources
- A reflection model for the cyclotron lines in the spectra of X-ray pulsars
- NICER and Fermi GBM Observations of the First Galactic Ultraluminous X-ray Pulsar Swift J0243.6+6124
- Optically thick envelopes around ULXs powered by accreating neutron stars
- On the dependence of the X-ray continuum variations with luminosity in accreting X-ray pulsars
- Insight-HXMT discovery of the highest energy CRSF from the first Galactic ultra-luminous X-ray pulsar Swift J0243.6+6124
- Timing properties of ULX pulsars: optically thick envelopes and outflows
- Study of Recent outburst in the Be/X-ray binary RX J0209.6-7427 with AstroSat: A new ultraluminous X-ray pulsar in the Magellanic Bridge?
- The 2019 super-Eddington outburst of RX J0209.6-7427: Detection of pulsations and constraints on the magnetic field strength
- On the radiation beaming of bright X-ray pulsars and constraints on neutron star mass-radius relation
- On the magnetic field of the first Galactic ultraluminous X-ray pulsar Swift J0243.6+6124
- Transient X-ray pulsar V0332+53: pulse phase-resolved spectroscopy and the reflection model
- Hot disk of the Swift J0243.6+6124 revealed by Insight-HXMT
- Swift observations of SMC X-3 during its 2016-2017 super-Eddington outburst
- Compton scattering S-matrix and cross section in strong magnetic field
- Insight-HXMT observations of Swift J0243.6+6124 during its 2017-2018 outburst
- Insight-HXMT observations of Swift J0243.6+6124: the evolution of RMS pulse fractions at super-Eddington luminosity
- Timing analysis of EXO 2030+375 during its 2021 giant outburst observed with Insight-HXMT
- Comparing the Super-Eddington accretion of SMC X-3 and RX J0209.6-7427 with Swift J0243.6+6124
- 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