Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 512, Issue 3, Pages 4541-4555Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac773
Keywords
stars: evolution; stars: individual: H 1743-322; X-rays: binaries
Categories
Funding
- National Key R&D Program of China [2021YFA0718500]
- National Natural Science Foundation of China [U1838201, U1838202, U1938101, 12173103, U2038101, U1938103, 11733009]
- Guangdong Major Project of Basic and Applied Basic Research [2019B030302001]
- China National Space Administration (CNSA)
- Chinese Academy of Sciences (CAS)
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We studied the 2018 outburst of the black hole transient H 1743 - 322 and found that it remained in the low/hard state throughout the outburst. The quasi-periodic oscillation frequency and several parameters were positively correlated, and the initial rising phase was revealed.
We studied the 2018 outburst of the black hole transient H 1743 - 322 with a series of Insight-HXMT, NICER, and NuSTAR observations, covering the 1-120 keV band. With our broad-band X-ray spectral modelling, we confirm that the source remained in the low/hard state throughout the month-long outburst, although it became marginally softer at peak flux. We detected Type-C quasi-periodic oscillations (QPOs) and followed the evolution of their properties. The QPO frequency increased from similar to 0.1 to similar to 0.4 Hz during the rising phase of the outburst and decreased again in the decline. Continuum X-ray flux, power-law photon index, QPO frequency, and QPO root-mean-square amplitude were positively correlated. The QPO amplitude was slightly higher in the soft X-ray band (typical values of 12-16 per cent, compared with 8-10 per cent in the hard band). Our spectral-timing results shed light on the initial rising phase in the low/hard state, which has rarely been monitored with such high cadence, time resolution, and broad-band coverage. Combining spectral and timing properties, we find that 'failed' (hard state only) and 'successful' outbursts follow the same initial evolutionary track, although the former class of outburst never reaches the threshold for a transition to softer (thermally dominated) accretion regimes.
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