Issue |
A&A
Volume 691, November 2024
|
|
---|---|---|
Article Number | A268 | |
Number of page(s) | 8 | |
Section | Astrophysical processes | |
DOI | https://doi.org/10.1051/0004-6361/202450657 | |
Published online | 19 November 2024 |
NICER and Swift/XRT monitoring of the 2023 outburst of Swift J1727.7–1613
1
Jülich Supercomputing Centre, Forschungszentrum Jülich, Wilhelm-Johnen-Straße, 52428 Jülich, Germany
2
Institute of Astronomy, National Tsing Hua University, No. 101 Sect. 2 Kuang-Fu Road, 30013 Hsinchu, Taiwan
⋆ Corresponding authors; h.stiele@fz-juelich.de; akong@gapp.nthu.edu.tw
Received:
8
May
2024
Accepted:
30
September
2024
Aims. The X-ray transient Swift J1727.7–1613 was first detected on August 24 2023 by Swift/BAT and INTEGRAL. We investigated data from the Neutron star Interior Composition Explorer (NICER) and the Neil GehrelsSwift Observatory taken between August and October 2023.
Methods. We studied diagnostic diagrams, energy spectra, and short term variability. The observations cover the initial rise of the outburst in the hard state and the transition to the soft state. We focused on the evolution of quasi-periodic oscillations (QPOs) using power-density spectra and on the evolution of the spectral parameters.
Results. The overall evolution of Swift J1727.7–1613 is consistent with this source being a low-mass black hole X-ray binary. Based on the Lense-Thirring precession interpretation of type-C QPOs, we obtained outer radii for the hot inner flow and found that the overall evolution of these radii agrees well with the evolution of the inner disc radii obtained from fits to the energy spectra. This result holds on all timescales tested in this study and supports the Lense-Thirring precession interpretation of type-C QPOs.
Key words: accretion, accretion disks / black hole physics / binaries: general / X-rays: individuals: Swift J1727.7–1613
© ESO 2018
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.