New insights on the puzzling LMXB 1RXS J180408.9-342058: the intermediate state, the clocked type-I X-ray bursts and much more

Abstract

1RXS J180408.9--342058 is a low mass X-ray binary hosting a neutron star, which shows X-ray activity at very different mass-accretion regimes, from very faint to almost the Eddington luminosity. In this work, we present a comprehensive X-ray study of this source using data from the Neil Gehrels Swift Observatory, NuSTAR and INTEGRAL/JEM-X. In order to follow the spectral evolution, we analysed the 2015 outburst using Swift data and three Nustar observations. Besides the canonical hard and soft spectral states, we identified the rarely observed intermediate state. This was witnessed by the appeareance of the accretion disk emission in the spectrum (at $k{T}_{\mathrm{disk}}$ $\sim$0.7 keV) and the simultaneous cooling of the hot corona. In addition, we also unveiled a hard tail above 30 keV in this state. In the hard state, a thermal Comptonization model with two seed photons populations ($k{T}_{\mathrm{s},1}\sim 1.5$ keV and $k{T}_{\mathrm{s},2}\sim 0.4$ keV, respectively) and a hot Comptonising plasma, represents the physically best motivated scenario to describe the data. We also estimated a reflection fraction below 20% in all states, while no constraints on the inclination and only lower limits on the inner disk radius could be inferred. Finally, we studied a number of type-I X-ray bursts displayed from the source, one of them at the Eddington limit (observed with JEM-X). Their characteristics, combined with the clocked behaviour observed during the intermediate state, point out H/He composition for the accreted material, which makes unlikely the helium dwarf nature for the companion.

arXiv commentAccepted for publication in MNRAS

References in corpus (71)

• On the Absorption of X-rays in the Interstellar Medium
• 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
• Thermonuclear (type-I) X-ray bursts observed by the Rossi X-ray Timing Explorer
• Improved Reflection Models of Black-Hole Accretion Disks: Treating the Angular Distribution of X-rays
• Photospheric radius expansion X-ray bursts as standard candles
• Hard X-ray Emission From Low Mass X-ray Binaries
• Six new candidate ultracompact X-ray binaries
• 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
• The Discovery of a State Dependent Hard Tail in the X-ray Spectrum of the Luminous Z-source GX 17+2
• Helium-rich thermonuclear bursts and the distance to the accretion-powered millisecond pulsar SAX J1808.4-3658
• A Brown Dwarf Companion for the Accreting Millisecond Pulsar SAX J1808.4-3658
• The XMM-Newton/Chandra monitoring campaign of the Galactic center region: Description of the program and preliminary results
• Periodic Thermonuclear X-ray Bursts from GS 1826-24 and the Fuel Composition as a Function of Accretion Rate
• On the possibility of a helium white dwarf donor in the presumed ultracompact binary 2S 0918-549
• Optical spectroscopy and photometry of SAX J1808.4-3658 in outburst
• Detection of a Hard Tail in the X-ray Spectrum of the Z Source GX 349+2
• The X-ray spectrum of the atoll source 4U 1608-52
• Low-level accretion in neutron-star X-ray binaries
• Average hard X-ray emission from NS LMXBs: Observational evidence of different spectral states in NS LMXBs
• Bursts from GS 1826-238: a clocked thermonuclear flashes generator
• The behavior of subluminous X-ray transients near the Galactic center as observed using the X-ray telescope aboard Swift
• BeppoSAX Wide Field Cameras observations of six type I X-ray bursters
• Truncated disc versus extremely broad iron line in XTE J1650-500
• Analysis of NuSTAR and Suzaku observations of Cyg X-1 in the hard state: evidence for a truncated disc geometry
• A peculiar spectral state transition of 4U1705--44: when an Atoll looks like a Z
• A new Comptonization model for low-magnetized accreting neutron stars in low mass X-ray binaries
• Modelling the high mass accretion rate spectra of GX 339-4: Black hole spin from reflection?
• A four-year baseline Swift study of enigmatic X-ray transients located near the Galactic center
• The faintest accretors
• Eddington-limited X-ray Bursts as Distance Indicators. I. Systematic Trends and Spherical Symmetry in Bursts from 4U 1728-34
• A four-year XMM-Newton/Chandra monitoring campaign of the Galactic Centre: analysing the X-ray transients
• Bimodal spectral variability of Cygnus X-1 in an intermediate state
• The magnetic field in the X-ray corona of Cygnus X-1
• Constraints on neutron star mass and radius in GS 1826-24 from sub-Eddington X-ray bursts
• An in-depth study of a neutron star accreting at low Eddington rate: On the possibility of a truncated disk and an outflow
• Spectral variability of GX 339-4 in a hard-to-soft state transition
• A self-consistent approach to the hard and soft states of 4U 1705-44
• The nature of very faint X-ray binaries; hints from light curves
• The Composite Broad Band Spectrum of Cir X-1 at the Periastron: a Peculiar Z-source
• Suzaku broad-band spectrum of 4U 1705-44: Probing the Reflection component in the hard state
• BeppoSAX observation of 4U 1705-44: detection of hard X-ray emission in the soft state
• The X-ray spectral properties of very-faint persistent neutron star X-ray binaries
• XMMU J174716.1-281048: a "quasi-persistent" very faint X-ray transient?
• The influence of accretion rate and metallicity on thermonuclear bursts: predictions from KEPLER models
• Discovery of the X-ray burster SAX J1752.3-3138
• The puzzling source IGR J17361-4441 in NGC 6388: a possible planetary tidal disruption event
• A Hard X-ray View on Scorpius X-1 with INTEGRAL: non-Thermal Emission ?
• NuSTAR and XMM-Newton Observations of the Neutron Star X-ray Binary 1RXS J180408.9-34205
• A Soft X-Ray Spectral Episode for the Clocked Burster, GS 1826-24 as Measured by Swift and NuSTAR
• Are the very faint X-ray transients period gap systems?
• Study of the reflection spectrum of the accreting neutron star GX 3+1 using XMM-Newton and INTEGRAL
• NuSTAR reveals the extreme properties of the super-Eddington accreting SMBH in PG 1247+267
• Unveiling the high energy tail of 1E 1740.7-2942 with INTEGRAL
• Disk reflection and a possible disk wind during a soft X-ray state in the neutron star low-mass X-ray binary 1RXS J180408.9-342058
• INTEGRAL spectral variability study of the atoll 4U 1820-30: first detection of hard X-ray emission
• 1RXS J180408.9-342058: an ultra compact X-ray binary candidate with a transient jet
• Disc-Jet coupling in the LMXB 4U1636-53 from INTEGRAL
• Spectral states evolution of 4U 1728-34 observed by INTEGRAL and RXTE: non-thermal component detection
• Wide band observations of the X-ray burster GS 1826-238
• Searching for the most powerful thermonuclear X-ray bursts with the Neil Gehrels Swift Observatory
• Very hard states in neutron star low-mass X-ray binaries
• The Physics of Hybrid Thermal/Non-Thermal Plasmas
• Rapid X-ray variability properties during the unusual very hard state in neutron-star low-mass X-ray binaries
• Monitoring campaign of 1RXS J171824.2-402934, the low-mass X-ray binary with the lowest mass accretion rate
• Spectral analysis of the dipping LMXB system XB 1916-053
• Outbursts in ultracompact X-ray binaries
• The broadband spectral analysis of 4U 1702-429 using XMM-Newton and BeppoSAX data
• Unveiling the hard X-ray spectrum from the "burst-only" source SAX J1753.5-2349 in outburst
• A $\sim$100 mHz QPO in the X-ray emission from IGR J17361-4441

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