NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
NuSTAR and XMM-Newton Observations of 1E1743.1-2843: Indications of a Neutron Star LMXB Nature of the Compact ObjectWe 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 approximately 1.8 keV emitted from a hot spot or an equatorial strip on an NS surface. This spectrum is thermally Comptonized by electrons with kTe approximately 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 Kaline 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(sub H) approximately 1.6 x 10(exp 23) cm(exp -2)).
Document ID
20170003071
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Lotti, Simone
(Istituto di Astrofisica e Planetologia Spaziale (INAF-IAPS) Rome, Italy)
Natalucci, Lorenzo
(Istituto di Astrofisica e Planetologia Spaziale (INAF-IAPS) Rome, Italy)
Mori, Kaya
(Columbia Univ. New York, NY, United States)
Baganoff, Frederick K.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Boggs, Steven E.
(California Univ. Berkeley, CA, United States)
Christensen, Finn E.
(Danish Space Research Inst. Lyngby, Denmark)
Craig, William W.
(California Univ. Berkeley, CA, United States)
Hailey, Charles J.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Harrison, Fiona A.
(California Inst. of Tech. Pasadena, CA, United States)
Hong, Jaesub
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Krivonos, Roman A.
(California Univ. Berkeley, CA, United States)
Rahoui, Farid
(Harvard Univ. Cambridge, MA, United States)
Stern, Daniel
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Tomsick, John A.
(California Univ. Berkeley, CA, United States)
Zhang, Shuo
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Zhang, William W.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
April 6, 2017
Publication Date
May 5, 2016
Publication Information
Publication: The Astrophysical Journal
Publisher: AAS/IOP publishing partnership
Volume: 822
Issue: 1
ISSN: 0004-637X
e-ISSN: 1538-4357
Subject Category
Astronomy
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN40844
Funding Number(s)
CONTRACT_GRANT: NNG08FD60C
CONTRACT_GRANT: ASI/INAF-I/037/12/0
CONTRACT_GRANT: RSF-14-22-00271
Distribution Limits
Public
Copyright
Other
Keywords
accretion
accretion disks – stars: neutron – X-rays: binaries – X-rays: individual

Available Downloads

There are no available downloads for this record.
No Preview Available