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Jet quenching in the neutron star low-mass X-ray binary 1RXS J180408.9−342058

Jet quenching in the neutron star low-mass X-ray binary 1RXS J180408.9−342058
Jet quenching in the neutron star low-mass X-ray binary 1RXS J180408.9−342058
We present quasi-simultaneous radio (VLA) and X-ray (Swift) observations of the neutron star low-mass X-ray binary (NS-LMXB) 1RXS J180408.9−342058 (J1804) during its 2015 outburst. We found that the radio jet of J1804 was bright (232 ± 4 μJy at 10 GHz) during the initial hard X-ray state, before being quenched by more than an order of magnitude during the soft X-ray state (19 ± 4 μJy). The source then was undetected in radio (< 13 μJy) as it faded to quiescence. In NS-LMXBs, possible jet quenching has been observed in only three sources and the J1804 jet quenching we show here is the deepest and clearest example to date. Radio observations when the source was fading towards quiescence (LX = 1034 − 35 erg s−1) show that J1804 must follow a steep track in the radio/X-ray luminosity plane with β > 0.7 (where LR∝LβX). Few other sources have been studied in this faint regime, but a steep track is inconsistent with the suggested behaviour for the recently identified class of transitional millisecond pulsars. J1804 also shows fainter radio emission at LX < 1035 erg s−1 than what is typically observed for accreting millisecond pulsars. This suggests that J1804 is likely not an accreting X-ray or transitional millisecond pulsar.
0035-8711
Gusinskaia, N.V.
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Deller, A.T.
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Hessels, J.W.T.
fcc8a364-fa85-4137-863a-eecda7665dda
Degenaar, N.
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Miller-Jones, J.C.A.
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Wijnands, R.
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Parikh, A.S.
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Russell, T.D.
a3056d2c-1f5d-4dac-8903-aa77e4af2e9e
Altamirano, D.
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Gusinskaia, N.V.
93c92e0c-f8c6-4c9d-92c5-aee00fe6eb8c
Deller, A.T.
d9eab233-8cf7-4f14-a590-e02da059b13d
Hessels, J.W.T.
fcc8a364-fa85-4137-863a-eecda7665dda
Degenaar, N.
54149051-d74e-4e43-a7cd-501ec4023511
Miller-Jones, J.C.A.
3f659cec-bbb3-447c-b94e-4f170af560a6
Wijnands, R.
382893ee-0e03-45e3-9321-db8b9fc74914
Parikh, A.S.
827ba362-a0c9-4838-8bc4-01a1f7bf0500
Russell, T.D.
a3056d2c-1f5d-4dac-8903-aa77e4af2e9e
Altamirano, D.
d5ccdb09-0b71-4303-9538-05b467be075b

Gusinskaia, N.V., Deller, A.T., Hessels, J.W.T., Degenaar, N., Miller-Jones, J.C.A., Wijnands, R., Parikh, A.S., Russell, T.D. and Altamirano, D. (2017) Jet quenching in the neutron star low-mass X-ray binary 1RXS J180408.9−342058. Monthly Notices of the Royal Astronomical Society. (doi:10.1093/mnras/stx1235).

Record type: Article

Abstract

We present quasi-simultaneous radio (VLA) and X-ray (Swift) observations of the neutron star low-mass X-ray binary (NS-LMXB) 1RXS J180408.9−342058 (J1804) during its 2015 outburst. We found that the radio jet of J1804 was bright (232 ± 4 μJy at 10 GHz) during the initial hard X-ray state, before being quenched by more than an order of magnitude during the soft X-ray state (19 ± 4 μJy). The source then was undetected in radio (< 13 μJy) as it faded to quiescence. In NS-LMXBs, possible jet quenching has been observed in only three sources and the J1804 jet quenching we show here is the deepest and clearest example to date. Radio observations when the source was fading towards quiescence (LX = 1034 − 35 erg s−1) show that J1804 must follow a steep track in the radio/X-ray luminosity plane with β > 0.7 (where LR∝LβX). Few other sources have been studied in this faint regime, but a steep track is inconsistent with the suggested behaviour for the recently identified class of transitional millisecond pulsars. J1804 also shows fainter radio emission at LX < 1035 erg s−1 than what is typically observed for accreting millisecond pulsars. This suggests that J1804 is likely not an accreting X-ray or transitional millisecond pulsar.

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Jet quenching in the neutron star low-mass X-ray binary - Accepted Manuscript
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Accepted/In Press date: 17 May 2017
e-pub ahead of print date: 19 May 2017
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 411624
URI: http://eprints.soton.ac.uk/id/eprint/411624
ISSN: 0035-8711
PURE UUID: 20c30a23-c165-4cc4-9136-1621661dd812
ORCID for D. Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 21 Jun 2017 16:31
Last modified: 22 Nov 2021 03:06

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Contributors

Author: N.V. Gusinskaia
Author: A.T. Deller
Author: J.W.T. Hessels
Author: N. Degenaar
Author: J.C.A. Miller-Jones
Author: R. Wijnands
Author: A.S. Parikh
Author: T.D. Russell
Author: D. Altamirano ORCID iD

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