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The evolution of ra...
The evolution of rapid optical/X-ray timing correlations in the initial hard state of MAXIJ1820+070
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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.
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- Gandhi, P. (författare)
- Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England.
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- Shahbaz, T. (författare)
- Inst Astrofis Canarias IAC, E-38205 San Cristobal la Laguna, Tenerife, Spain.;Univ La Laguna ULL, Dept Astrofis, E-38206 San Cristobal la Laguna, Tenerife, Spain.
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- Veledina, Alexandra (författare)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland.;Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.,Nordiska institutet för teoretisk fysik (Nordita),University of Turku, Finland
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- Malzac, J. (författare)
- IRAP Univ Toulouse, CNES, UPS, CNRS, F-31400 Toulouse, France.
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- Buckley, D. A. H. (författare)
- South African Astron Observ, Observ Rd, ZA-7925 Cape Town, South Africa.;Univ Cape Town, Dept Astron, Private Bag X3, ZA-7701 Rondebosch, South Africa.
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- Charles, P. A. (författare)
- Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England.
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- Rajwade, K. (författare)
- Univ Manchester, Dept Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England.
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- Dhillon, V. S. (författare)
- Inst Astrofis Canarias IAC, E-38205 San Cristobal la Laguna, Tenerife, Spain.;Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England.
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- Littlefair, S. P. (författare)
- 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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- Uttley, P. (författare)
- Univ Amsterdam, Astron Inst Anton Pannekoek, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands.
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- Vincentelli, F. M. (författare)
- Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England.
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- Misra, R. (författare)
- Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India.
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Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England;Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India. Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England. (creator_code:org_t)
- 2021-05-27
- 2021
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 505:3, s. 3452-3469
- Relaterad länk:
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https://arxiv.org/pd...
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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 report on a multiepoch campaign of rapid optical/X-ray timing observations of the superbright 2018 outburst of MAXIJ1820+070, a black hole low-mass X-ray binary system. The observations spanned 80 d in the initial hard state and were taken with NTT/ULTRACAM and GTC/HiPERCAM in the optical (u(s)g(s)r(s)i(s)z(s) filters at time resolutions of 8-300Hz) and with ISS/NICER in X-rays. We find (i) a growing anticorrelation between the optical and X-ray light curves, (ii) a steady, positive correlation at an optical lag of similar to 0.2s (with a longer lag at longer wavelengths) present in all epochs, and (iii) a curious positive correlation at negative optical lags in the last, X-ray softest epoch, with longer wavelengths showing a greater correlation and a more negative lag. To explain these, we postulate the possible existence of two synchrotron-emitting components - a compact jet and a hot flow. In our model, the significance of the jet decreases over the outburst, while the hot flow remains static (thus, relatively, increasing in significance). We also discuss a previously discovered quasi-periodic oscillation and note how it creates coherent optical time lags, stronger at longer wavelengths, during at least two epochs.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- accretion
- accretion discs
- X-rays: binaries
- X-rays: individual: MAXIJ1820+070
- black holes
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Paice, J. A.
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Gandhi, P.
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Shahbaz, T.
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Veledina, Alexan ...
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Malzac, J.
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Buckley, D. A. H ...
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visa fler...
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Charles, P. A.
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Rajwade, K.
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Dhillon, V. S.
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Littlefair, S. P ...
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Marsh, T. R.
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Uttley, P.
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Vincentelli, F. ...
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Misra, R.
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