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NuSTAR and XMM-Newton observations of the ultraluminous X-ray source NGC 5643 X-1

Krivonos, Roman and Sazonov, Sergey (2016) NuSTAR and XMM-Newton observations of the ultraluminous X-ray source NGC 5643 X-1. Monthly Notices of the Royal Astronomical Society, 463 (1). pp. 756-762. ISSN 0035-8711. doi:10.1093/mnras/stw2058.

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We present a high-quality hard X-ray spectrum of the ultraluminous X-ray source (ULX) NGC 5643 X-1 measured with NuSTAR in 2014 May–June. We have obtained this spectrum by carefully separating the signals from the ULX and from the active nucleus of its host galaxyNGC 5643 located 0.8 arcmin away. Together with long XMM–Newton observations performed in 2009 July and 2014 August, the NuSTAR data confidently reveal a high-energy cutoff in the spectrum of NGC 5643 X-1 above ∼10 keV, which is a characteristic signature of ULXs. The NuSTAR and XMM–Newton data are consistent with the source having a constant luminosity ∼1.5 × 10^(40) erg s^(−1) (0.2–12 keV) in all but the latest observation (2014 August) when it brightened to ∼3 × 10^(40) erg s^(−1). This increase is associated with the dominant, hard spectral component (presumably collimated emission from the inner regions of a supercritical accretion disc), while an additional, soft component (with a temperature ∼0.3 keV if described by multicolour disc emission), possibly associated with a massive wind outflowing from the disc, is also evident in the spectrum but does not exhibit significant variability.

Item Type:Article
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URLURL TypeDescription Paper
Krivonos, Roman0000-0003-2737-5673
Additional Information:© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 August 12. Received 2016 July 19; in original form 2016 June 17. Published: 16 August 2016. This work has made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory and funded by the National Aeronautics and Space Administration, and re-observations obtained with XMM–Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA. The research has made use of the NuSTAR Data Analysis Software (nustardas) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). The work was supported by the Russian Science Foundation (grant 14-12-01315).
Subject Keywords:accretion, accretion discs – galaxies: individual: NGC 5643 – X-rays: binaries – X-rays: individual: NGC 5643 X-1
Issue or Number:1
Record Number:CaltechAUTHORS:20160829-141753109
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Official Citation:Roman Krivonos, Sergey Sazonov; NuSTAR and XMM–Newton observations of the ultraluminous X-ray source NGC 5643 X-1, Monthly Notices of the Royal Astronomical Society, Volume 463, Issue 1, 21 November 2016, Pages 756–762,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69992
Deposited By: Joy Painter
Deposited On:29 Aug 2016 21:34
Last Modified:11 Nov 2021 04:22

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