Evaluating the jet/accretion coupling of Aql X-1: probing the contribution of accretion flow spectral components
arXiv:2204.10910 · doi:10.1093/mnras/stad548
Abstract
The coupling between radio and X-ray luminosity is an important diagnostic tool to study the connection between the accretion inflow and jet outflow for low-mass X-ray binaries (LMXBs). When comparing NS- and BH-LMXBs, we find that the radio/X-ray correlation for individual NS-LMXBs is scattered, whereas for individual BH-LMXBs a more consistent correlation is generally found. Furthermore, we observe jet quenching for both types of LMXBs, but it is unclear what exactly causes this, and if jets in NS-LMXBs quench as strongly as those in BH-LMXBs. While additional soft X-ray spectral components can be present for NS-LMXBs due to the presence of the neutron star's surface, disentangling the individual X-ray spectral components has thus far not been considered when studying the radio/X-ray coupling. Here we present eleven epochs of Swift/XRT observations matched with quasi-simultaneous archival radio observations of the 2009 November outburst of Aql X-1. We decompose the thermal and Comptonised spectral components in the Swift/XRT spectra, with the aim of studying whether the presence of additional thermal emission affects the coupling of the radio/X-ray luminosity. We find that there is no evidence of a significant thermal contribution in Swift/XRT spectra that could cause scatter in the radio/X-ray coupling. However, a noteworthy finding is that the X-ray observation with the strongest statistically significant thermal component occurs around the same epoch as a bright radio detection. Follow-up research using more sensitive X-ray observations combined with densely sampled near-simultaneous radio observations is required to explore the radio/X-ray coupling for NS-LMXBs in more detail.
arXiv comment14 pages (12 main, 2 appendix), 12 figures, 4 tables. Accepted for publication in MNRAS
References in corpus (47)
- 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
- Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs
- Towards a unified model for black hole X-ray binary jets
- Modelling the behaviour of accretion flows in X-ray binaries
- The disc instability model of dwarf-novae and low-mass X-ray binary transients
- An online repository of Swift/XRT light curves of GRBs
- Thermonuclear (type-I) X-ray bursts observed by the Rossi X-ray Timing Explorer
- A universal radio/X-ray correlation in low/hard state black hole binaries
- The Swift/BAT Hard X-ray Transient Monitor
- Radio / X-ray correlation in the low/hard state of GX 339--4
- Jets from black hole X-ray binaries: testing, refining and extending empirical models for the coupling to X-rays
- Quenching of the radio jet during the X-ray high state of GX 339-4
- 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
- Large-Scale, Decelerating, Relativistic X-ray Jets from the Microquasar XTE J1550-654
- Hysteresis in the Light Curves of Soft X-ray Transients
- Evaluating Spectral Models and the X-ray States of Neutron-Star X-ray Transients
- X-ray emission from black-hole binaries
- XTE J1701-462 and its Implications for the Nature of Subclasses in Low-Magnetic-Field Neutron Star Low-Mass X-Ray Binaries
- An extremely powerful long-lived superluminal ejection from the black hole MAXI J1820+070
- Testing the jet quenching paradigm with an ultradeep observation of a steadily soft state black hole
- Disk-jet coupling in the 2017/2018 outburst of the Galactic black hole candidate X-ray binary MAXI J1535-571
- Multi-wavelength observations of the Galactic black hole transient 4U1543-47 during outburst decay: state transitions and jet contribution
- Hard state neutron star and black hole X-ray binaries in the radio:X-ray luminosity plane
- Complete Multiwavelength Evolution of Galactic Black Hole Transients During Outburst Decay I: Conditions for "Compact" Jet Formation
- The X-ray spectrum of the atoll source 4U 1608-52
- Low-level accretion in neutron-star X-ray binaries
- The variable cyclotron line in GX 301-2
- Disc-jet coupling in an atoll-type neutron star X-ray binary: 4U 1728-34 (GX 354-0)
- The black hole transient MAXI J1348-630: evolution of the compact and transient jets during its 2019/2020 outburst
- Radio detections of the neutron star X-ray binaries 4U 1820-30 and Ser X-1 in soft X-ray states
- Evolution of the radio - X-ray coupling throughout an entire outburst of Aquila X-1
- Partial accretion in the propeller stage of low mass X-ray binary Aql X--1
- The disc-jet coupling in the neutron star X-ray binary Aquila X-1
- A new radio census of neutron star X-ray binaries
- Mining the Aql X-1 long term X-ray light curve
- Correlated Timing and Spectral Variations of the Soft X-ray Transient Aquila X-1: Evidence for an Atoll classification
- Jet quenching in the neutron star low-mass X-ray binary 1RXS J180408.9342058
- The evolving jet spectrum of the neutron star X-ray binary Aql X-1 in transitional states during its 2016 outburst
- Accretion Geometry of the Low-Mass X-ray Binary Aquila X-1 in the Soft and Hard States
- Hard X-ray Flares Preceding Soft X-ray Outbursts in Aquila X-1: A Link between Neutron Star and Black Hole State Transitions
- The hybrid radio/X-ray correlation of the black hole transient MAXI J1348-630
- Quasi-simultaneous radio and X-ray observations of Aql X-1: probing low luminosities
- The evolving radio jet from the neutron star X-ray binary 4U 182030
- Boundary layer on the surface of a neutron star
- Broadband Spectral Analysis of Aql X-1