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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2022

Investigating the nature and properties of MAXI J1810−222 with radio and X-ray observations

T.D. Russell
  • Fonction : Auteur
M. del Santo
  • Fonction : Auteur
A. Marino
  • Fonction : Auteur
A. Segreto
  • Fonction : Auteur
S.E. Motta
  • Fonction : Auteur
A. Bahramian
  • Fonction : Auteur
A. d'Aì
  • Fonction : Auteur
T. Di Salvo
  • Fonction : Auteur
J.C.A. Miller-Jones
  • Fonction : Auteur
C. Pinto
  • Fonction : Auteur
F. Pintore
  • Fonction : Auteur
A. Tzioumis
  • Fonction : Auteur

Résumé

We present results from radio and X-ray observations of the X-ray transient MAXI J1810−222. The nature of the accretor in this source has not been identified. In this paper, we show results from a quasi-simultaneous radio and X-ray monitoring campaign taken with the Australia Telescope Compact Array, the Neil Gehrels Swift Observatory X-ray Telescope (XRT), and the Swift Burst Alert Telescope. We also analyse the X-ray temporal behaviour using observations from the Neutron star Interior Composition Explorer. Results show a seemingly peculiar X-ray spectral evolution of MAXI J1810−222 during this outburst, where the source was initially only detected in the soft X-ray band for the early part of the outburst. Then, ∼200 d after MAXI J1810−222 was first detected the hard X-ray emission increased and the source transitioned to a long-lived (∼1.5 yr) bright, harder X-ray state. After this hard state, MAXI J1810−222 returned back to a softer state, before fading and transitioning again to a harder state and then appearing to follow a more typical outburst decay. From the X-ray spectral and timing properties, and the source’s radio behaviour, we argue that the results from this study are most consistent with MAXI J1810−222 being a relatively distant (≳6 kpc) black hole X-ray binary. A sufficiently large distance to source can simply explain the seemingly odd outburst evolution that was observed, where only the brightest portion of the outburst was detectable by the all-sky XRTs.
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Dates et versions

hal-03677050 , version 1 (23-03-2023)

Identifiants

Citer

T.D. Russell, M. del Santo, A. Marino, A. Segreto, S.E. Motta, et al.. Investigating the nature and properties of MAXI J1810−222 with radio and X-ray observations. Monthly Notices of the Royal Astronomical Society, 2022, 513 (4), pp.6196-6209. ⟨10.1093/mnras/stac1332⟩. ⟨hal-03677050⟩
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