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The evolution of ra...
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Paice, J. A.Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England.;Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India.
(författare)
The evolution of rapid optical/X-ray timing correlations in the initial hard state of MAXIJ1820+070
- Artikel/kapitelEngelska2021
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2021-05-27
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Oxford University Press (OUP),2021
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LIBRIS-ID:oai:DiVA.org:kth-299620
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299620URI
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https://doi.org/10.1093/mnras/stab1531DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-196983URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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QC 20220413
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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.
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Gandhi, P.Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England.
(författare)
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Shahbaz, T.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.
(författare)
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Veledina, AlexandraStockholms 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(Swepub:su)avele
(författare)
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Malzac, J.IRAP Univ Toulouse, CNES, UPS, CNRS, F-31400 Toulouse, France.
(författare)
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Buckley, D. A. H.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.
(författare)
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Charles, P. A.Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England.
(författare)
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Rajwade, K.Univ Manchester, Dept Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England.
(författare)
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Dhillon, V. S.Inst Astrofis Canarias IAC, E-38205 San Cristobal la Laguna, Tenerife, Spain.;Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England.
(författare)
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Littlefair, S. P.Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England.
(författare)
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Marsh, T. R.Univ Warwick, Dept Phys, Astron & Astrophys Grp, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England.
(författare)
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Uttley, P.Univ Amsterdam, Astron Inst Anton Pannekoek, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands.
(författare)
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Vincentelli, F. M.Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England.
(författare)
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Misra, R.Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India.
(författare)
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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)
Sammanhörande titlar
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Ingår i:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)505:3, s. 3452-34690035-87111365-2966
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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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