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NuSTAR and XMM-Newton observations of 1E1743.1-2843: indications of a neutron star LMXB nature of the compact object

Lotti, Simone and Natalucci, Lorenzo and Mori, Kaya and Baganoff, Frederick K. and Boggs, Steven E. and Christensen, Finn E. and Craig, William W. and Hailey, Charles J. and Harrison, Fiona A. and Hong, Jaesub and Krivonos, Roman A. and Rahoui, Farid and Stern, Daniel and Tomsick, John A. and Zhang, Shuo and Zhang, William W. (2016) NuSTAR and XMM-Newton observations of 1E1743.1-2843: indications of a neutron star LMXB nature of the compact object. Astrophysical Journal, 822 (1). Art. No. 57. ISSN 0004-637X. doi:10.3847/0004-637X/822/1/57.

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We report on the results of NuSTAR and XMM-Newton observations of the persistent X-ray source 1E1743.1-2843, located in the Galactic Center region. The source was observed between 2012 September and October by NuSTAR and XMM-Newton, providing almost simultaneous observations in the hard and soft X-ray bands. The high X-ray luminosity points to the presence of an accreting compact object. We analyze the possibilities of this accreting compact object being either a neutron star (NS) or a black hole, and conclude that the joint XMM-Newton and NuSTAR spectrum from 0.3 to 40 keV fits a blackbody spectrum with kT ~ 1.8 keV emitted from a hot spot or an equatorial strip on an NS surface. This spectrum is thermally Comptonized by electrons with kT_e ~ 4.6 keV. Accepting this NS hypothesis, we probe the low-mass X-ray binary (LMXB) or high-mass X-ray binary (HMXB) nature of the source. While the lack of Type-I bursts can be explained in the LMXB scenario, the absence of pulsations in the 2 mHz–49 Hz frequency range, the lack of eclipses and of an IR companion, and the lack of a K_ɑline from neutral or moderately ionized iron strongly disfavor interpreting this source as a HMXB. We therefore conclude that 1E1743.1-2843 is most likely an NS-LMXB located beyond the Galactic Center. There is weak statistical evidence for a soft X-ray excess which may indicate thermal emission from an accretion disk. However, the disk normalization remains unconstrained due to the high hydrogen column density (N_H ~ 1.6 x 10^(23)cm^(-2).

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Lotti, Simone0000-0002-3088-1561
Natalucci, Lorenzo0000-0002-6601-9543
Mori, Kaya0000-0002-9709-5389
Boggs, Steven E.0000-0001-9567-4224
Christensen, Finn E.0000-0001-5679-1946
Harrison, Fiona A.0000-0003-2992-8024
Krivonos, Roman A.0000-0003-2737-5673
Rahoui, Farid0000-0001-7655-4120
Stern, Daniel0000-0003-2686-9241
Tomsick, John A.0000-0001-5506-9855
Zhang, Shuo0000-0002-2967-790X
Zhang, William W.0000-0002-1426-9698
Additional Information:© 2016 The American Astronomical Society. Received 2015 October 16; accepted 2016 March 4; published 2016 May 5. This work was supported under NASA Contract No. NNG08FD60C, and 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. We thank the NuSTAR Operations, Software and Calibration teams for support with the execution and analysis of these observations. This 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 Italian authors acknowledge the Italian Space Agency (ASI) for financial support by ASI/INAF grant I/037/12/0. RK acknowledges support from Russian Science Foundation (grant 14-22-00271).
Funding AgencyGrant Number
Agenzia Spaziale Italiana (ASI)I/037/12/0
Istituto Nazionale di Astrofisica (INAF)UNSPECIFIED
Russian Science Foundation14-22-00271
Subject Keywords:accretion, accretion disks; stars: neutron; X-rays: binaries; X-rays: individual (1E1743.1-2843)
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2016-55
Issue or Number:1
Record Number:CaltechAUTHORS:20160318-104326136
Persistent URL:
Official Citation:Simone Lotti et al 2016 ApJ 822 57
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65481
Deposited By: Melissa Ray
Deposited On:18 Mar 2016 19:00
Last Modified:10 Nov 2021 23:46

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