4.7 Article

Physical origin of the non-physical spin evolution of MAXI J1820+070

期刊

出版社

OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab945

关键词

accretion, accretion discs; black hole physics; stars: individual (MAXI J1820+070); X-rays: binaries

资金

  1. China National Space Administration (CNSA)
  2. Chinese Academy of Sciences (CAS)
  3. National Key Research and Development Program of China [2016YFA0400800, 2016YFA0400803]
  4. National Natural Science Foundation of China [U2038102, U1838115, U1838201, 11673023, U1938104, U1838111, 11473027, U1838202, 11733009, U1838104, U1938101]

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The Insight-HXMT observations of the black hole X-ray binary MAXI J1820+070 during its 2018 outburst show an evolution of the inferred spin and other parameters during its high soft state, possibly related to the evolution of the inner disc or deceleration of a jet-like corona. The spin of MAXI J1820+070 is constrained to be a(*) = 0.2(-0.3)(+0.2), indicating that the strong jet activity is mainly driven by the accretion disc rather than by the black hole spin.
We report on the Insight-HXMT observations of the new black hole X-ray binary MAXI J1820+070 during its 2018 outburst. Detailed spectral analysis via the continuum fitting method shows an evolution of the inferred spin during its high soft sate. Moreover, the hardness ratio, the non-thermal luminosity and the reflection fraction also undergo an evolution, exactly coincident to the period when the inferred spin transition takes place. The unphysical evolution of the spin is attributed to the evolution of the inner disc, which is caused by the collapse of a hot corona due to condensation mechanism or may be related to the deceleration of a jet-like corona. The studies of the inner disc radius and the relation between the disc luminosity and the inner disc radius suggest that, only at a particular epoch, did the inner edge of the disc reach the innermost stable circular orbit and the spin measurement is reliable. We then constrain the spin of MAXI J1820 + 070 to be a(*) = 0.2(-0.3)(+0.2). Such a slowly spinning black hole possessing a strong jet suggests that its jet activity is driven mainly by the accretion disc rather than by the black hole spin.

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