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dc.contributor.authorGusinskaia, N.V.
dc.contributor.authorHessels, J.W.T.
dc.contributor.authorDegenaar, N.
dc.contributor.authorDeller, A.T.
dc.contributor.authorMiller-Jones, James
dc.contributor.authorArchibald, A.M.
dc.contributor.authorHeinke, C.O.
dc.contributor.authorMoldón, J.
dc.contributor.authorPatruno, A.
dc.contributor.authorTomsick, J.A.
dc.contributor.authorWijnands, R.
dc.date.accessioned2020-07-22T13:31:46Z
dc.date.available2020-07-22T13:31:46Z
dc.date.issued2020
dc.identifier.citationGusinskaia, N.V. and Hessels, J.W.T. and Degenaar, N. and Deller, A.T. and Miller-Jones, J.C.A. and Archibald, A.M. and Heinke, C.O. et al. 2020. Quasi-simultaneous radio and X-ray observations of Aql X-1: Probing low luminosities. Monthly Notices of the Royal Astronomical Society. 492 (2): pp. 2858-2871.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/80104
dc.identifier.doi10.1093/mnras/stz3420
dc.description.abstract

© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society Aql X-1 is one of the best-studied neutron star low-mass X-ray binaries. It was previously targeted using quasi-simultaneous radio and X-ray observations during at least seven different accretion outbursts. Such observations allow us to probe the interplay between accretion inflow (X-ray) and jet outflow (radio). Thus far, these combined observations have only covered one order of magnitude in radio and X-ray luminosity range; this means that any potential radio-X-ray luminosity correlation, LR ∝ LXβ, is not well constrained (β ≈ 0.4-0.9, based on various studies) or understood. Here we present quasi-simultaneous Very Large Array and Swift-XRT observations of Aql X-1's 2016 outburst, with which we probe one order of magnitude fainter in radio and X-ray luminosity compared to previous studies (6 × 1034 erg s−1 < LX <3 × 1035 erg s−1, i.e. the intermediate to low-luminosity regime between outburst peak and quiescence). The resulting radio non-detections indicate that Aql X-1's radio emission decays more rapidly at low X-ray luminosities than previously assumed - at least during the 2016 outburst. Assuming similar behaviour between outbursts, and combining all available data in the hard X-ray state, this can be modelled as a steep β =1.17+−003021 power-law index or as a sharp radio cut-off at LX ≲ 5 × 1035 erg s−1 (given our deep radio upper limits at X-ray luminosities below this value). We discuss these results in the context of other similar studies.

dc.languageEnglish
dc.publisherOXFORD UNIV PRESS
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/FT140101082
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectAstronomy & Astrophysics
dc.subjectstars: neutron
dc.subjectX-rays: binaries
dc.subjectNEUTRON-STAR
dc.subjectBLACK-HOLES
dc.subjectHARD STATE
dc.subjectACCRETION
dc.subjectBINARY
dc.subjectPULSATIONS
dc.subjectPOWER
dc.subjectJETS
dc.subjectEMISSION
dc.subjectFLOWS
dc.titleQuasi-simultaneous radio and X-ray observations of Aql X-1: Probing low luminosities
dc.typeJournal Article
dcterms.source.volume492
dcterms.source.number2
dcterms.source.startPage2858
dcterms.source.endPage2871
dcterms.source.issn0035-8711
dcterms.source.titleMonthly Notices of the Royal Astronomical Society
dc.date.updated2020-07-22T13:31:45Z
curtin.note

Copyright © 2020 The American Astronomical Society. All rights reserved.

curtin.departmentSchool of Elec Eng, Comp and Math Sci (EECMS)
curtin.accessStatusOpen access
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidMiller-Jones, James [0000-0003-3124-2814]
curtin.contributor.researcheridMiller-Jones, James [B-2411-2013]
dcterms.source.eissn1365-2966
curtin.contributor.scopusauthoridMiller-Jones, James [10044231400]


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