Photoionization instability of the Fe K absorbing plasma in the neutron star transient AX J1745.6-2901

Abstract

AX J1745.6-2901 is a Low Mass X-ray Binary with an accreting neutron star, showing clear evidence for highly ionized absorption. Strong ionized Fe K$\alpha$ and K$\beta$ absorption lines are always observed during the soft state, whereas they disappear during the hard states. We computed photoionization stability curves for the hard and the soft state, under different assumptions on the adopted spectral energy distributions and the physical parameters of the plasma. We observe that the ionized absorber lies always on a stable branch of the photoionization stability curve during the soft state, while it becomes unstable during the hard state. This suggests that photoionization instability plays a key role in defining the observable properties of the ionized absorber. The same process might explain the disappearance of the high ionization absorber/wind, during the hard state in other accreting neutron stars and black holes.

arXiv comment9 pages, 7 figures, accepted for publication in MNRAS

References in corpus (30)

• Towards a unified model for black hole X-ray binary jets
• MERLIN observations of relativistic ejections from GRS 1915+105
• Ubiquitous equatorial accretion disc winds in black hole soft states
• Jets from black hole X-ray binaries: testing, refining and extending empirical models for the coupling to X-rays
• Jets in neutron star X-ray binaries: a comparison with black holes
• Radiatively efficient accreting black holes in the hard state: the case study of H1743-322
• On the Origin of Radio Emission in the X-ray States of XTE J1650-500 during the 2001-2002 Outburst
• Black hole-like hysteresis and accretion states in neutron star low mass X-ray binaries
• Spectral changes during dipping in low-mass X-ray binaries due to highly-ionized absorbers
• Regulation of black-hole accretion by a disk wind during a violent outburst of V404 Cygni
• Testing the jet quenching paradigm with an ultradeep observation of a steadily soft state black hole
• A Hybrid Magnetically/Thermally-Driven Wind in the Black Hole GRO J1655-40?
• Evidence for simultaneous jets and disk winds in luminous low-mass X-ray binaries
• Analysing the atolls: X-ray spectral transitions of accreting neutron stars
• X-ray Binaries
• The Disk-Wind-Jet Connection in the Black Hole H 1743-322
• The disc-jet coupling in the neutron star X-ray binary Aquila X-1
• Absorption lines from magnetically-driven winds in X-ray binaries
• A connection between accretion state and $\text{Fe K absorption}$ in an accreting neutron star: black hole-like soft state winds?
• Coronae and Winds from Irradiated Disks in X-ray binaries
• On the Fe K absorption - accretion state connection in the Galactic center neutron star X-ray binary AX J1745.6-2901
• Properties of warm absorbers in active galaxies: a systematic stability curve analysis
• Links between quasi-periodic oscillations and accretion states in neutron star low mass X-ray binaries
• Flares, wind and nebulae: the 2015 December mini-outburst of V404 Cygni
• High ionisation absorption in low mass X-ray binaries
• The effects of thermodynamic stability on wind properties in different low mass black hole binary states
• Irradiation of Astrophysical Objects - SED and Flux Effects on Thermally Driven Winds
• Measurements of Solar Differential Rotation and Meridional Circulation from Tracking of Photospheric Magnetic Features
• The puzzling orbital period evolution of the low mass X-ray binary AX J1745.6-2901
• Thermal instability in X-ray photoionized media in Active Galactic Nuclei: Influence on the gas structure and spectral features

Cited by in corpus (24)

• Strong disc winds traced throughout outbursts in black-hole X-ray binaries
• Hard-state accretion disk winds from black holes: the revealing case of MAXI J1820+070
• The low-luminosity accretion disc wind of the black hole transient V4641 Sagittarii
• Near-infrared emission lines trace the state-independent accretion disc wind of the black hole transient MAXI J1820+070
• The 1989 and 2015 outbursts of V404 Cygni: a global study of wind-related optical features
• The Disk Wind in the Neutron Star Low-mass X-Ray Binary GX 13+1
• Chandra reveals a possible ultra-fast outflow in the super-Eddington Be/X-ray binary Swift J0243.6+6124
• A Comprehensive Chandra Study of the Disk Wind in the Black Hole Candidate 4U 1630-472
• Chandra high-resolution spectra of 4U~1630-47: the disappearance of the wind
• NuSTAR + XMM-Newton monitoring of the neutron star transient AX J1745.6-2901
• The current state of disk wind observations in BHLMXBs through X-ray absorption lines in the iron band
• Simultaneous X-ray and optical spectroscopy of V404 Cygni supports the multi-phase nature of X-ray binary accretion disc winds
• Outflows and spectral evolution in the eclipsing AMXP SWIFT J1749.4-2807 with NICER, XMM-Newton and NuSTAR
• The origin of optical emission lines in the soft state of X-ray binary outbursts: the case of MAXI J1820+070
• disnht: modeling X-ray absorption from distributed column densities
• Simultaneous detection of an intrinsic absorber and a compact jet emission in the X-ray binary IGR J17091-3624 during a hard accretion state
• Impact of the disk magnetization on MHD disk wind signature
• An ultrafast outflow in the black hole candidate MAXI J1810-222?
• A Spectroscopic Angle on Central Engine Size Scales in Accreting Neutron Stars
• Evolution of the disc atmosphere in the X-ray binary MXB 1659-298, during its 2015-2017 outburst
• Accretion disc winds in X-ray binaries
• 20 years of disk winds in 4U 1630-47 -- I. Long-term behavior and influence of hard X-rays
• XMM-Newton multi-year campaign on NGC 55 ULX-1: Resolving the wind and its variability with RGS
• Expected disk wind properties evolution along an X-ray Binary outburst