The evolving radio jet from the neutron star X-ray binary 4U 1820−30

Russell, Thomas; Degenaar, N.; Eijnden, J. van den; Santo, M. Del; Segreto, A.; Altamirano, D.; Beri, Aru; Trigo, María Díaz; Miller-Jones, J. C. A.

doi:10.1093/mnrasl/slab087

Cited by 13 publications

(19 citation statements)

References 46 publications

(64 reference statements)

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“…4U 1820−303 is also a known radio emitter (e.g., Migliari et al 2004;Díaz Trigo et al 2017;Russell et al 2021). At low X-ray fluxes, the radio spectrum is typically observed to be relatively flat, consistent with a compact radio jet, while, at higher X-ray fluxes (Russell et al 2021), the radio spectrum becomes steep, consistent with either a quenching of the compact jet emission or emission from a transient jet ejecta (Russell et al 2021).…”

Section: Introductionmentioning

confidence: 99%

First Detection of X-Ray Polarization from the Accreting Neutron Star 4U 1820−303

Marco

Monaca

Poutanen

et al. 2023

ApJL

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This paper reports the first detection of polarization in the X-rays for atoll-source 4U 1820−303, obtained with the Imaging X-ray Polarimetry Explorer (IXPE) at 99.999% confidence level (CL). Simultaneous polarimetric measurements were also performed in the radio with the Australia Telescope Compact Array. The IXPE observations of 4U 1820−303 were coordinated with Swift X-ray Telescope, Neutron Star Interior Composition Explorer, and Nuclear Spectroscopic Telescope Array aiming to obtain an accurate X-ray spectral model covering a broad energy interval. The source shows a significant polarization above 4 keV, with a polarization degree of 2.0% ± 0.5% and a polarization angle of −55° ± 7° in the 4–7 keV energy range, and a polarization degree of 10% ± 2% and a polarization angle of −67° ± 7° in the 7–8 keV energy bin. This polarization also shows a clear energy trend with polarization degree increasing with energy and a hint for a position-angle change of ≃90° at 96% CL around 4 keV. The spectro-polarimetric fit indicates that the accretion disk is polarized orthogonally to the hard spectral component, which is presumably produced in the boundary/spreading layer. We do not detect linear polarization from the radio counterpart, with a 3σ upper limit of 50% at 7.25 GHz.

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Section: Introductionmentioning

confidence: 99%

First Detection of X-Ray Polarization from the Accreting Neutron Star 4U 1820−303

Marco

Monaca

Poutanen

et al. 2023

ApJL

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“…Apart from pulsars, we have also detected some well-known X-ray binaries -in Terzan 5, EXO 1745-248, which was in outburst at the time of the observations (Tetarenko et al 2016b ), here catalogued as Ter5-ATCA3; in NGC 6624, 4U 1820-30, here catalogued as N6624-ATCA1 (see Russell et al 2021 andPanurach et al 2021 ); and in Terzan 6, GRS 1747-312, here catalogued as Ter6-ATCA1 (see Panurach et al 2021 ). We have previously published two Xray binaries disco v ered as part of this ATCA surv e y: in 47 Tuc, the candidate black hole X9 (Miller-Jones et al 2015 ), here catalogued as 47Tuc-ATCA1; and in NGC 6652, the candidate transitional MSP NGC 6652B (Heinke, Edmonds & Grindlay 2001 ;Paduano et al 2021 ), here catalogued as N6652-ATCA3.…”

Section: Known Sourcesmentioning

confidence: 86%

The MAVERIC survey: a catalogue of radio sources in southern globular clusters from the Australia Telescope Compact Array

Tudor

Miller-Jones

Strader

et al. 2022

Monthly Notices of the Royal Astronomical Society

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Radio continuum observations offer a new window on compact objects in globular clusters compared to typical X-ray or optical studies. As part of the MAVERIC survey, we have used the Australia Telescope Compact Array to carry out a deep (median central noise level ≈4 μJy) radio continuum survey of 26 southern globular clusters at central frequencies of 5.5 and 9.0 GHz. This paper presents a catalogue of 1285 radio continuum sources in the fields of these 26 clusters. Considering the surface density of background sources, we find significant evidence for a population of radio sources in seven of the 26 clusters, and also identify at least 11 previously known compact objects (6 pulsars and 5 X-ray binaries). While the overall density of radio continuum sources with 7.25-GHz flux densities ≳ 20 μJy in typical globular clusters is relatively low, the survey has already led to the discovery of several exciting compact binaries, including a candidate ultracompact black hole X-ray binary in 47 Tuc. Many of the unclassified radio sources near the centres of the clusters are likely to be true cluster sources, and multi-wavelength follow-up will be necessary to classify these objects and better understand the demographics of accreting compact binaries in globular clusters.

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“…Aquila X-1 and 1RXS J180408.9-342058 (Miller-Jones et al 2010;Gusinskaia et al 2017, respectively). Instead, 4U 1820 -30 shows some reduction in radio flux density and change in spectral index consistent with a quenching of the compact jet and possible launch of transient ejecta (Migliari et al 2004;Russell et al 2021).…”

Section: Introductionmentioning

confidence: 93%

Long term radio monitoring of the neutron star X-ray binary Swift J1858.6-0814

Rhodes,

Fender,

Motta

et al. 2022

Preprint

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We present the results of our long term radio monitoring campaign at 1.3GHz (MeerKAT) and 15.5 GHz (Arcminute Microkelvin Imager -Large Array, AMI-LA) for the outburst of the recently discovered neutron star X-ray binary Swift J1858.6−0814. Throughout the outburst, we observe radio emission consistent with a quasi-persistent, self-absorbed jet. In addition, we see two flares at MJD 58427 and 58530. The second flare allows us to place constraints on the magnetic field and minimum energy of the jet at 0.2 G and 5×10 37 erg, respectively. We use the multi-frequency radio data in conjunction with data from Swift-BAT to place Swift J1858.6-0814 on the radio/X-ray correlation. We find that the quasi-simultaneous radio and BAT data makes Swift J1858.6-0814 appears to bridge the gap in the radio/X-ray plane between atoll and Z sources. Furthermore, AMI-LA observations made whilst Swift J1858.6-0814 was in the soft state have allowed us to show that the radio emission during the soft state is quenched by at least a factor of four.

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The evolving radio jet from the neutron star X-ray binary 4U 1820−30

Cited by 13 publications

References 46 publications

First Detection of X-Ray Polarization from the Accreting Neutron Star 4U 1820−303

First Detection of X-Ray Polarization from the Accreting Neutron Star 4U 1820−303

The MAVERIC survey: a catalogue of radio sources in southern globular clusters from the Australia Telescope Compact Array

Long term radio monitoring of the neutron star X-ray binary Swift J1858.6-0814

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