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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. (author)

The evolution of rapid optical/X-ray timing correlations in the initial hard state of MAXIJ1820+070

  • Article/chapterEnglish2021

Publisher, publication year, extent ...

  • 2021-05-27
  • Oxford University Press (OUP),2021
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-299620
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299620URI
  • https://doi.org/10.1093/mnras/stab1531DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-196983URI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • QC 20220413
  • 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.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Gandhi, P.Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England. (author)
  • 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. (author)
  • 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 (author)
  • Malzac, J.IRAP Univ Toulouse, CNES, UPS, CNRS, F-31400 Toulouse, France. (author)
  • 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. (author)
  • Charles, P. A.Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England. (author)
  • Rajwade, K.Univ Manchester, Dept Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England. (author)
  • 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. (author)
  • Littlefair, S. P.Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England. (author)
  • Marsh, T. R.Univ Warwick, Dept Phys, Astron & Astrophys Grp, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England. (author)
  • Uttley, P.Univ Amsterdam, Astron Inst Anton Pannekoek, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands. (author)
  • Vincentelli, F. M.Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England. (author)
  • Misra, R.Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India. (author)
  • 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)

Related titles

  • In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)505:3, s. 3452-34690035-87111365-2966

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