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A rapid optical and...
A rapid optical and X-ray timing study of the neutron star X-ray binary SwiftJ1858.6-0814
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- Shahbaz, T. (författare)
- Inst Astrofis Canarias IAC, E-38205 Tenerife, Spain.;Univ La Laguna ULL, Dept Astrofis, E-38206 Tenerife, Spain.
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- Paice, J. A. (författare)
- Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England.;Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India.;Univ Manchester, Dept Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England.
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- Rajwade, K. M. (författare)
- Univ Manchester, Dept Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England.;Netherlands Inst Radio Astron, ASTRON, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands.,Univ Manchester, Dept Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England.;Univ Coll Cork, Dept Phys & Astron, Coll Rd, Cork T12 K8AF, Ireland.
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- Veledina, Alexandra (författare)
- Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),University of Turku, Finland,Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland.; NORDITA SU, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.;Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.
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- Gandhi, P. (författare)
- Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England.
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- Dhillon, V. S. (författare)
- Inst Astrofis Canarias IAC, E-38205 Tenerife, Spain.;Univ La Laguna ULL, Dept Astrofis, E-38206 Tenerife, Spain.;Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England.
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- Marsh, T. R. (författare)
- Univ Warwick, Dept Phys, Astron & Astrophys Grp, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England.
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- Littlefair, S. (författare)
- Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England.
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- Kennedy, M. R. (författare)
- Univ Manchester, Dept Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England.;Univ Coll Cork, Dept Phys & Astron, Coll Rd, Cork T12 K8AF, Ireland.
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- Breton, R. P. (författare)
- Univ Manchester, Dept Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England.
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- Clark, C. J. (författare)
- Univ Manchester, Dept Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England.;Albert Einstein Inst, Max Planck Inst Gravitat Phys, Callinstr 38, D-30167 Hannover, Germany.;Leibniz Univ Hannover, D-30167 Hannover, Germany.
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Inst Astrofis Canarias IAC, E-38205 Tenerife, Spain;Univ La Laguna ULL, Dept Astrofis, E-38206 Tenerife, Spain. Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England.;Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India.;Univ Manchester, Dept Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England. (creator_code:org_t)
- 2023-01-14
- 2023
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 520:1, s. 542-559
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- We present a rapid timing analysis of optical (HiPERCAM and ULTRACAM) and X-ray (NICER) observations of the X-ray transient SwiftJ1858.6-0814 during 2018 and 2019. The optical light curves show relatively slow, large amplitude (similar to 1mag in g(s)) 'blue' flares (i.e. stronger at shorter wavelengths) on time-scales of similar to minutes as well as fast, small amplitude (similar to 0.1mag in g(s)) 'red' flares (i.e. stronger at longer wavelengths) on time-scales of similar to seconds. The 'blue' and 'red' flares are consistent with X-ray reprocessing and optically thin synchrotron emission, respectively, similar to what is observed in other X-ray binaries. The simultaneous optical versus soft- and hard-band X-ray light curves show time- and energy-dependent correlations. The 2019 March 4 and parts of the June data show a nearly symmetric positive cross-correlations (CCFs) at positive lags consistent with simple X-ray disc reprocessing. The soft- and hard-band CCFs are similar and can be reproduced if disc reprocessing dominates in the optical and one component (disc or synchrotron Comptonization) dominates both the soft and hard X-rays. A part of the 2019 June data shows a very different CCFs. The observed positive correlation at negative lag in the soft band can be reproduced if the optical synchrotron emission is correlated with the hot flow X-ray emission. The observed timing properties are in qualitative agreement with the hybrid inner hot accretion flow model, where the relative role of the different X-ray and optical components that vary during the course of the outburst, as well as on shorter time-scales, govern the shape of the optical/X-ray CCFs.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- accretion
- accretion discs
- stars: neutron
- X-rays: binaries
- X-rays: individual: SwiftJ18586-0814
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Shahbaz, T.
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Paice, J. A.
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Rajwade, K. M.
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Veledina, Alexan ...
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Gandhi, P.
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Dhillon, V. S.
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Marsh, T. R.
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Littlefair, S.
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Kennedy, M. R.
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Breton, R. P.
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Clark, C. J.
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Kungliga Tekniska Högskolan
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Stockholms universitet