Outflows and spectral evolution in the eclipsing AMXP SWIFT J1749.4-2807 with NICER, XMM-Newton and NuSTAR

Abstract

The neutron star low-mass X-ray binary SWIFT J1749.4-2807 is the only known eclipsing accreting millisecond X-ray pulsar. In this manuscript we perform a spectral characterization of the system throughout its 2021, two-week-long outburst, analyzing 11 NICER observations and quasi-simultaneous XMM-Newton and NuSTAR single observations at the outburst peak. The broadband spectrum is well-modeled with a black body component with a temperature of $\sim$0.6 keV, most likely consistent with a hot spot on the neutron star surface, and a Comptonisation spectrum with power-law index $\Gamma \sim 1.9$, arising from a hot corona at $\sim$12 keV. No direct emission from the disc was found, possibly due to it being too cool. A high truncation radius for the disc, i.e., at $\sim$20--30 R${}_G$ , was obtained from the analysis of the broadened profile of the Fe line in the reflection component. The significant detection of a blue-shifted Fe XXVI absorption line at $\sim$7 keV indicates weakly relativistic X-ray disc winds, which are typically absent in the hard state of X-ray binaries. By comparing the low flux observed during the outburst and the one expected in a conservative mass-transfer, we conclude that mass-transfer in the system is highly non-conservative, as also suggested by the wind detection. Finally, using the Nicer spectra alone, we followed the system while it was fading to quiescence. During the outburst decay, as the spectral shape hardened, the hot spot on the neutron star surface cooled down and shrank, a trend which could be consistent with the pure power-law spectrum observed during quiescence.

arXiv comment15 pages, 9 figure; accepted for publication on MNRAS

References in corpus (104)

• On the Absorption of X-rays in the Interstellar Medium
• The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• Masses, Radii, and Equation of State of Neutron Stars
• Modelling the behaviour of accretion flows in X-ray binaries
• Improved Reflection Models of Black-Hole Accretion Disks: Treating the Angular Distribution of X-rays
• A Radio Pulsar/X-ray Binary Link
• Optimal binning of X-ray spectra and response matrix design
• Radiation mechanisms and geometry of Cygnus X-1 in the soft state
• Ubiquitous equatorial accretion disc winds in black hole soft states
• Relativistic X-ray Lines from the Inner Accretion Disks Around Black Holes
• Irradiation of an Accretion Disc by a Jet: General Properties and Implications for Spin Measurements of Black Holes
• Crustal Heating and Quiescent Emission from Transiently Accreting Neutron Stars
• A state change in the low-mass X-ray binary XSS J12270-4859
• Launching of Conical Winds and Axial Jets from the Disk-Magnetosphere Boundary: Axisymmetric and 3D Simulations
• The Accretion Disk Wind in the Black Hole GRO J1655-40
• On why the Iron K-shell absorption in AGN is not a signature of the local Warm/Hot Intergalactic Medium
• An Overabundance of Transient X-ray Binaries within 1 pc of the Galactic Center
• Black hole-like hysteresis and accretion states in neutron star low mass X-ray binaries
• On the role of the UV and X-ray radiation in driving a disk wind in X-ray binaries
• The First Swift Ultra-Violet/Optical Telescope GRB Afterglow Catalog
• Accretion disc atmospheres and winds in low-mass X-ray binaries
• The XMM-Newton/Chandra monitoring campaign of the Galactic center region: Description of the program and preliminary results
• X-ray follow-ups of XSSJ12270-4859: a low-mass X-ray binary with gamma ray FERMI-LAT association
• Where May Ultra-Fast Rotating Neutron Stars Be Hidden?
• X-ray coherent pulsations during a sub-luminous accretion disk state of the transitional millisecond pulsar XSS J12270-4859
• The X-ray spectrum of the atoll source 4U 1608-52
• Low-level accretion in neutron-star X-ray binaries
• The neutron star transient and millisecond pulsar in M28: from sub-luminous accretion to rotation-powered quiescence
• Orbital Evolution of an Accreting Millisecond Pulsar: Witnessing the Banquet of a Hidden Black Widow?
• Evidence for simultaneous jets and disk winds in luminous low-mass X-ray binaries
• BeppoSAX Wide Field Cameras observations of six type I X-ray bursters
• Hard-state accretion disk winds from black holes: the revealing case of MAXI J1820+070
• INTEGRAL spectroscopy of the accreting millisecond pulsar XTE J1807-294 in outburst
• The magnetic field strengths of accreting millisecond pulsars
• Accreting Millisecond X-Ray Pulsars
• Transitional millisecond pulsars
• The Variable Quiescent X-ray Emission of the Neutron Star Transient XTE J1701-462
• The X-ray spectrum of the newly discovered accreting millisecond pulsar IGR J17511-3057
• Further X-ray observations of EXO 0748-676 in quiescence: evidence for a cooling neutron star crust
• The faintest accretors
• General-Relativistic Simulations of Four States of Accretion onto Millisecond Pulsars
• Pulsating in unison at optical and X-ray energies: simultaneous high-time resolution observations of the transitional millisecond pulsar PSR J1023+0038
• The accretion flow to the intermittent accreting ms pulsar, HETE J1900.1-2455, as observed by XMM-Newton and RXTE
• An in-depth study of a neutron star accreting at low Eddington rate: On the possibility of a truncated disk and an outflow
• A self-consistent approach to the hard and soft states of 4U 1705-44
• A Hard X-Ray Power-Law Spectral Cutoff in Centaurus X-4
• The nature of very faint X-ray binaries; hints from light curves
• A connection between accretion state and $\text{Fe K absorption}$ in an accreting neutron star: black hole-like soft state winds?
• Testing reflection features in 4U 1705-44 with XMM-Newton, BeppoSAX and RXTE in the hard and soft state
• Neutron star atmosphere composition: the quiescent, low-mass X-ray binary in the globular cluster M28
• Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704
• On the Fe K absorption - accretion state connection in the Galactic center neutron star X-ray binary AX J1745.6-2901
• XMMU J174716.1-281048: a "quasi-persistent" very faint X-ray transient?
• Timing of the 2008 Outburst of SAX J1808.4-3658 with XMM-Newton: A Stable Orbital Period Derivative over Ten Years
• A persistent ultraviolet outflow from an accreting neutron star binary transient
• Thermal Disk Winds in X-ray Binaries: Realistic Heating and Cooling Rates Give Rise to Slow, but Massive Outflows
• Discovery of the X-ray burster SAX J1752.3-3138
• The effects of thermodynamic stability on wind properties in different low mass black hole binary states
• On the timing properties of SAX J1808.4-3658 during its 2015 outburst
• Broad-band spectral analysis of the accreting millisecond X-ray pulsar SAX J1748.9-2021
• NuSTAR and XMM-Newton broad-band spectrum of SAX J1808.4-3658 during its latest outburst in 2015
• GRB060602B = Swift J1749.4-2807: an unusual transiently accreting neutron-star X-ray binary
• Discovery of a new accreting millisecond X-ray pulsar in the globular cluster NGC 2808
• Chandra X-ray spectroscopy of a clear dip in GX 13+1
• Accreting pulsars: mixing-up accretion phases in transitional systems
• Evidence of Fast Magnetic Field Evolution in an Accreting Millisecond Pulsar
• Discovery of an accreting millisecond pulsar in the eclipsing binary system Swift J1749.4-2807
• Disc-Jet Coupling in the Terzan 5 Neutron Star X-ray Binary EXO 1745$-$248
• XMM-Newton Spectroscopy of the Accretion-Driven Millisecond X-ray Pulsar XTE J1751-305 in Outburst
• A Firm Upper Limit to the Radius of the Neutron Star in SAX J1808.4-3658
• The Swift Bulge Survey: Motivation, Strategy, and First X-ray Results
• Hard-state optical wind during the discovery outburst of the black-hole X-ray dipper MAXI J1803-298
• Thermal and radiation driving can produce observable disk winds in hard-state X-ray binaries
• The radio-bright accreting millisecond X-ray pulsar IGR J17591-2342
• Linking burst-only X-ray binary sources to faint X-ray transients
• XMM-Newton observations of two transient millisecond X-ray pulsars in quiescence
• Indications of non-conservative mass-transfer in AMXPs
• Photoionization instability of the Fe K absorbing plasma in the neutron star transient AX J1745.6-2901
• Testing Rate Dependent corrections on timing mode EPIC-pn spectra of the accreting Neutron Star GX 13+1
• NuSTAR low energy effective area correction due to thermal blanket tear
• Timing the pulsations of the accreting millisecond pulsar SAX J1808.4-3658 during its 2019 outburst
• A strongly truncated inner accretion disk in the Rapid Burster
• XMM-Newton detection of the 2.1 ms coherent pulsations from IGR J17379-3747
• NICER Discovery of Millisecond X-ray Pulsations and an Ultracompact Orbit in IGR J17494-3030
• INTEGRAL, Swift, and RXTE observations of the 518 Hz accreting transient pulsar Swift J1749.4-2807
• New insights on the puzzling LMXB 1RXS J180408.9-342058: the intermediate state, the clocked type-I X-ray bursts and much more
• The quiescent X-ray properties of the accreting millisecond X-ray pulsar and eclipsing binary Swift J1749.4-2807
• Discovery of Eclipses from the Accreting Millisecond X-ray Pulsar SWIFT J1749.4-2807
• Potential cooling of an accretion-heated neutron star crust in the low-mass X-ray binary 1RXS J180408.9-342058
• Multiwavelength characterisation of the accreting millisecond X-ray pulsar and ultra-compact binary IGR J17062-6143
• Long-term coherent timing of the accreting millisecond pulsar IGR J17062-6143
• Reflection component in the Bright Atoll Source GX 9+9
• Monitoring campaign of 1RXS J171824.2-402934, the low-mass X-ray binary with the lowest mass accretion rate
• On obtaining neutron-star mass and radius constraints from quiescent low-mass X-ray binaries in the Galactic plane
• Spectral analysis of the low-mass X-ray pulsar 4U 1822-371: Reflection component in a high-inclination system
• Chandra-HETGS Characterization of an Outflowing Wind in the accreting millisecond pulsar IGR J17591-2342
• Evidence of a non-conservative mass transfer for XTE J0929-314
• Unveiling the hard X-ray spectrum from the "burst-only" source SAX J1753.5-2349 in outburst
• Accretion powered X-ray millisecond pulsars
• On the peculiar long-term orbital evolution of the eclipsing accreting millisecond X-ray pulsar SWIFT J1749.4-2807
• A faint outburst of the accreting millisecond X-ray pulsar SAX J1748.9-2021 in NGC 6440
• A search for the near-infrared counterpart of the eclipsing millisecond X-ray pulsar Swift J1749.4-2807
• Evolution of the disc atmosphere in the X-ray binary MXB 1659-298, during its 2015-2017 outburst

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• X-ray spectral properties of the accreting millisecond pulsar IGR J17498-2921 during its 2023 outburst
• Timing and spectral studies of SRGA J144459.2$-$604207 with NICER, Einstein Probe, IXPE, NuSTAR, Insight-HXMT and INTEGRAL during its 2024 outburst
• Detection of low-luminosity X-ray pulsations from the accreting millisecond pulsar IGR J17511-3057: An ever-thinning thread between bright accretion and sub-luminous states
• Thermonuclear Type-I X-ray Bursts and Burst Oscillations from the Eclipsing AMXP Swift J1749.4-2807
• The 2025 outburst of IGR J17511-3057: timing and spectral insights from NICER and NuSTAR
• The complex spectral behavior of the newly discovered neutron star X-ray binary Swift J1858.6-0814