The variable radio counterpart of Swift J1858.6-0814
arXiv:2006.06425 · doi:10.1093/mnras/staa1704
Abstract
Swift J1858.6-0814 is a transient neutron star X-ray binary discovered in October 2018. Multi-wavelength follow-up observations across the electromagnetic spectrum revealed many interesting properties, such as erratic flaring on minute timescales and evidence for wind outflows at both X-ray and optical wavelengths, strong and variable local absorption, and an anomalously hard X-ray spectrum. Here, we report on a detailed radio observing campaign consisting of one observation at 5.5/9 GHz with the Australia Telescope Compact Array, and nine observations at 4.5/7.5 GHz with the Karl G. Jansky Very Large Array. A radio counterpart with a flat to inverted radio spectrum is detected in all observations, consistent with a compact jet being launched from the system. Swift J1858.6-0814 is highly variable at radio wavelengths in most observations, showing significant variability when imaged on 3-to-5-minute timescales and changing up to factors of 8 within 20 minutes. The periods of brightest radio emission are not associated with steep radio spectra, implying they do not originate from the launching of discrete ejecta. We find that the radio variability is similarly unlikely to have a geometric origin, be due to scintillation, or be causally related to the observed X-ray flaring. Instead, we find that it is consistent with being driven by variations in the accretion flow propagating down the compact jet. We compare the radio properties of Swift J1858.6-0814 with those of Eddington-limited X-ray binaries with similar X-ray and optical characteristics, but fail to find a match in radio variability, spectrum, and luminosity.
arXiv comment14 pages, 8 figures, 3 tables; accepted for publication in MNRAS
References in corpus (69)
- Astropy: A Community Python Package for Astronomy
- The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
- 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
- On characterising the variability properties of X-ray light curves from active galaxies
- An online repository of Swift/XRT light curves of GRBs
- Lense-Thirring Precession and QPOs in Low Mass X-Ray Binaries
- Low frequency QPO spectra and Lense-Thirring precession
- Ubiquitous equatorial accretion disc winds in black hole soft states
- BlackCAT: A catalogue of stellar-mass black holes in X-ray transients
- A relativistic jet from Cygnus X-1 in the low/hard X-ray state
- Jets from black hole X-ray binaries: testing, refining and extending empirical models for the coupling to X-rays
- WATCHDOG: A Comprehensive All-Sky Database of Galactic Black Hole X-ray Binaries
- Jets in neutron star X-ray binaries: a comparison with black holes
- AU-Scale Synchrotron Jets and Superluminal Ejecta in GRS 1915+105
- A physical model for the continuum variability and QPO in accreting black holes
- On the Origin of Radio Emission in the X-ray States of XTE J1650-500 during the 2001-2002 Outburst
- A quasi-periodic modulation of the iron line centroid energy in the black hole binary H 1743-322
- UVMULTIFIT: A versatile tool for fitting astronomical radio interferometric data
- The variable radio emission from GRS 1915+105
- Sco X-1: The Evolution and Nature of the Twin Compact Radio Lobes
- Tearing up the disc: how black holes accrete
- The radio/X-ray domain of black hole X-ray binaries at the lowest radio luminosities
- Regulation of black-hole accretion by a disk wind during a violent outburst of V404 Cygni
- XTE J1701-462 and its Implications for the Nature of Subclasses in Low-Magnetic-Field Neutron Star Low-Mass X-Ray Binaries
- Keplerian frequency of uniformly rotating neutron stars and quark stars
- A rapidly-changing jet orientation in the stellar-mass black hole V404 Cygni
- 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
- Anomalous Radio-Wave Scattering from Interstellar Plasma Structures
- The accretion-ejection coupling in the black hole candidate X-ray binary MAXI J1836-194
- The spectral energy distribution of compact jets powered by internal shocks
- Evidence for simultaneous jets and disk winds in luminous low-mass X-ray binaries
- The spin parameter of uniformly rotating compact stars
- Correlated optical, X-ray, and gamma-ray flaring activity seen with INTEGRAL during the 2015 outburst of V404 Cygni
- Broken discs: warp propagation in accretion discs
- Extreme Jet Ejections from the Black Hole X-ray Binary V404 Cygni
- Hard-state accretion disk winds from black holes: the revealing case of MAXI J1820+070
- Evolution of the radio - X-ray coupling throughout an entire outburst of Aquila X-1
- Sco X-1: Energy Transfer from the Core to the Radio Lobes
- Ultraviolet and X-ray variability of active galactic nuclei with Swift
- Swift observations of V404 Cyg during the 2015 outburst: X-ray outflows from super-Eddington accretion
- NuSTAR Observations of the Accreting Atolls GX 3+1, 4U 1702-429, 4U 0614+091, and 4U 1746-371
- Radio Frequency Timing Analysis of the Compact Jet in the Black Hole X-ray Binary Cygnus X-1
- The low-luminosity accretion disc wind of the black hole transient V4641 Sagittarii
- Thermal Disk Winds in X-ray Binaries: Realistic Heating and Cooling Rates Give Rise to Slow, but Massive Outflows
- Radio-loudness in black hole transients: evidence for an inclination effect
- The rapid X-ray variability of V4641 Sagittarii (SAX J1819.3-2525 = XTE J1819-254)
- Modelling the cross-spectral variability of the black hole binary MAXI J1659-152 with propagating accretion rate fluctuations
- The Disk Wind in the Neutron Star Low-mass X-Ray Binary GX 13+1
- 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
- An equatorial outflow in the black hole optical dipper Swift J1357.2-0933
- Chandra reveals a possible ultra-fast outflow in the super-Eddington Be/X-ray binary Swift J0243.6+6124
- Hot, dense He II outflows during the 2017 outburst of the X-ray transient Swift J1357.2-0933
- X-Ray Observations of V4641 SGR (= SAX J1819.3-2525) During the Brief and Violent Outburst of 2003
- Tracking the variable jets of V404 Cygni during its 2015 outburst
- The Changing-look Optical Wind of the Flaring X-ray Transient Swift J1858.6-0814
- Hard X-ray variability of V404 Cyg during the 2015 outburst
- NuSTAR observations of the Transient Galactic Black Hole Binary Candidate Swift J1858.6-0814: A New Sibling of V404 Cyg and V4641 Sgr?
- The twisted jets of Circinus X-1
- A connection between accretion states and the formation of ultra-relativistic outflows in a neutron star X-ray binary
- Radio and X-ray observations of jet ejection in Cygnus X-2
- Radio Variability from a Quiescent Stellar Mass Black Hole Jet
- A Seyfert-2-like Spectrum in the High-Mass X-ray Binary Microquasar V4641 Sgr
- Low frequency radio monitoring of Cygnus X-1 and Cygnus X-3
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- A persistent ultraviolet outflow from an accreting neutron star binary transient
- A shared accretion instability for black holes and neutron stars
- Discovery of thermonuclear (Type I) X-ray bursts in the X-ray binary Swift J1858.6-0814 observed with NICER and NuSTAR
- Dips and eclipses in the X-ray binary Swift J1858.6-0814 observed with NICER
- Soft X-ray emission lines in the X-ray binary Swift J1858.6-0814 observed with XMM-Newton-RGS: disc atmosphere or wind?
- Simultaneous X-ray and radio observations of the transitional millisecond pulsar candidate CXOU J110926.4-650224. The discovery of a variable radio counterpart
- Long term radio monitoring of the neutron star X-ray binary Swift J1858.6-0814
- X-ray Eclipse Mapping Constrains the Binary Inclination and Mass Ratio of Swift J1858.6-0814
- Optical nebular emission following the most luminous outburst of Aquila X-1
- A rapid optical and X-ray timing study of the neutron star X-ray binary Swift J1858.6-0814
- Multi-band observations of Swift J0840.7-3516: a new transient ultra-compact X-ray binary candidate
- Accretion disc winds in X-ray binaries
- Long-Term X-Ray/UV Variability in ULXs
- The complex spectral behavior of the newly discovered neutron star X-ray binary Swift J1858.6-0814