Evolution of MAXI J1631–479 during the January 2019 outburst observed by INTEGRAL/IBIS
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Fecha
2020-01
Profesor/a Guía
Facultad/escuela
Idioma
en
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Oxford University Press
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Licencia CC
Licencia CC
Resumen
We report on a recent bright outburst from the new X-ray binary transient MAXI J1631–
479, observed in January 2019. In particular, we present the 30–200 keV analysis of spectral
transitions observed with INTEGRAL/IBIS during its Galactic plane monitoring program. In
the MAXI and BAT monitoring period, we observed two different spectral transitions between
the high/soft and low/hard states. The INTEGRAL spectrum from data taken soon before the
second transition is best described by a Comptonized thermal component with a temperature of
kTe ∼ 30 keV and a high-luminosity value of L2−200 keV ∼ 3 × 1038 erg−1 (assuming a distance
of 8 kpc). During the second transition, the source shows a hard, power-law spectrum. The lack
of high energy cut-off indicates that the hard X-ray spectrum from MAXI J1631–479 is due to
a non-thermal emission. Inverse Compton scattering of soft X-ray photons from a non-thermal
or hybrid thermal/non-thermal electron distribution can explain the observed X-ray spectrum
although a contribution to the hard X-ray emission from a jet cannot be determined at this
stage. The outburst evolution in the hardness-intensity diagram, the spectral characteristics,
and the rise and decay times of the outburst are suggesting that this system is a black hole
candidate
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Indexación: Scopus
Palabras clave
radiation mechanisms: non-thermal – stars: black holes – stars: individual: MAXI J1631–479 – stars: neutron – X-rays: binaries.
Citación
Monthly Notices of the Royal Astronomical Society Open AccessIssue 3, Pages 3657 - 36611 March 2020