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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2023

An ultrafast outflow in the black hole candidate MAXI J1810-222?

M del Santo
  • Fonction : Auteur
C Pinto
  • Fonction : Auteur
A Marino
  • Fonction : Auteur
A d'Aì
  • Fonction : Auteur
F Pintore
  • Fonction : Auteur
S.E Motta
  • Fonction : Auteur
T.D Russell
  • Fonction : Auteur
A Segreto
  • Fonction : Auteur
A Sanna
  • Fonction : Auteur

Résumé

The transient X-ray source MAXI J1810-222 was discovered in 2018 and has been active ever since. A long combined radio and X-ray monitoring campaign was performed with ATCA and Swift respectively. It has been proposed that MAXI J1810-222 is a relatively distant black hole X-ray binary, albeit showing a very peculiar outburst behaviour. Here, we report on the spectral study of this source making use of a large sample of NICER observations performed between 2019 February and 2020 September. We detected a strong spectral absorption feature at $\sim$1 keV, which we have characterised with a physical photoionisation model. Via a deep scan of the parameters space, we obtained evidence for a spectral-state dependent outflow, with mildly relativistic speeds. In particular, the soft and intermediate states point to a hot plasma outflowing at 0.05-0.15 $c$. This speeds rule-out thermal winds and, hence, they suggest that such outflows could be radiation pressure or (most likely) magnetically-driven winds. Our results are crucial to test current theoretical models of wind formation in X-ray binaries.
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Dates et versions

hal-04105009 , version 1 (21-04-2024)

Identifiants

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M del Santo, C Pinto, A Marino, A d'Aì, P.-O Petrucci, et al.. An ultrafast outflow in the black hole candidate MAXI J1810-222?. Monthly Notices of the Royal Astronomical Society, 2023, 523 (1), pp.L15-L20. ⟨10.1093/mnrasl/slad048⟩. ⟨hal-04105009⟩
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