SIMBAD references

2025MNRAS.536..509K - Mon. Not. R. Astron. Soc., 536, 509-517 (2025/January-1)

Monitoring observations of SMC X-1's excursions (MOOSE) III. X-ray spectroscopy of a warped, precessing accretion disc.

KARAM R., DAGE K.C., TETARENKO B.E., BRUMBACK M.C., HAGGARD D., BAHRAMIAN A., HU C.-P., NEILSEN J., ALTAMIRANO D., ATHUKORALALAGE W., CHARLES P.A., CLARKSON W.I., HICKOX R.C. and KENNEA J.

Abstract (from CDS):

The MOOSE (Monitoring Observations of SMC X-1's Excursions) program uses the Neutron Star Interior Composition Explorer Mission (NICER) to monitor the high-mass X-ray binary SMC X-1 during its superorbital period excursions. Here, we perform X-ray spectral analyses of 26 NICER observations of SMC X-1, taken at the tail-end of the excursion between 2021-04-01 and 2022-01-05. We use a single spectral model to fit spectra observed in high, intermediate, and low states, using a combination of a partial covering fraction model, a blackbody disc, and a power-law component. We find that the partial covering fraction varies significantly with the superorbital state during superorbital excursion. Our findings suggest that the low/high state in SMC X-1 is caused by a very high obscuration of the accretion disc.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): accretion, accretion discs - pulsars: individual: SMC X-1 - X-rays: binaries

Simbad objects: 2

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