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Record 1 of 1361
NuSTAR Discovery of a Cyclotron Line in the Accreting X-Ray Pulsar IGR J16393-4643
External Online Source: doi:10.3847/0004-637X/823/2/146
Author and Affiliation:
Bodaghee, Arash(Georgia Coll. and State Univ., Milledgeville, GA, United States)
Tomsick, John A.(California Univ., Berkeley, CA, United States)
Fornasini, Francesca M.(California Univ., Berkeley, CA, United States)
Krivonos, Roman(Academy of Sciences (USSR), Moscow, Russian Federation)
Stern, Daniel(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, United States)
Mori, Kaya(Columbia Univ., New York, NY, United States)
Rahoui, Farid(European Southern Observatory, Munich, Germany)
Boggs, Steven E.(California Univ., Berkeley, CA, United States)
Christensen, Finn E.(Technical Univ. of Denmark, Lyngby, Denmark)
Craig, William W.(California Univ., Berkeley, CA, United States) Show more authors
Abstract: The high-mass X-ray binary and accreting X-ray pulsar IGR J16393-4643 was observed by the Nuclear Spectroscope Telescope Array in the 3-79 keV energy band for a net exposure time of 50 ks. We present the results of this observation which enabled the discovery of a cyclotron resonant scattering feature with a centroid energy of -29.3(sup +1.1)(sub -1.3) keV. This allowed us to measure the magnetic field strength of the neutron star for the first time: B = (2.5 +/- 0.1) x 10(exp 12) G. The known pulsation period is now observed at 904.0+/- 0.1 s. Since 2006, the neutron star has undergone a long-term spin-up trend at a rate of P= -2 x 10(exp -8) s s(exp -1) (-0.6 s per year, or a frequency derivative of v = 3 x 10(exp -14) Hz s(exp -1)). In the power density spectrum, a break appears at the pulse frequency which separates the zero slope at low frequency from the steeper slope at high frequency. This addition of angular momentum to the neutron star could be due to the accretion of a quasi-spherical wind, or it could be caused by the transient appearance of a prograde accretion disk that is nearly in corotation with the neutron star whose magnetospheric radius is around 2 x 10(exp 8) cm.
Publication Date: Jun 01, 2016
Document ID:
20170003096
(Acquired Apr 13, 2017)
Subject Category: ASTROPHYSICS; ASTRONOMY
Report/Patent Number: GSFC-E-DAA-TN40858
Document Type: Journal Article
Publication Information: The Astrophysical Journal; p. 146; (ISSN 0004-637X; e-ISSN 1538-4357); Volume 823; No. 2
Publisher Information: AAS/IOP Publishing Partnership
Contract/Grant/Task Num: RSF G 14-22-00271
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Russian Basic Science Foundation; Russian Federation
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 7p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ACCRETION DISKS; ANGULAR MOMENTUM; CYCLOTRON RESONANCE; CYCLOTRONS; ENERGY BANDS; MAGNETIC FLUX; MAGNETOSPHERES; NEUTRON STARS; PULSARS; RESONANCE SCATTERING; SPECTROMETERS; TELESCOPES; X RAY BINARIES; CENTROIDS; COROTATION; EXPOSURE; FREQUENCIES; POWER SPECTRA; SCATTERING; SLOPES
Other Descriptors: ACCRETION; ACCRETION DISKS €“ GAMMA-RAY BURST: GENERAL €“ STARS: NEUTRON €“ X-RAYS: BIN
Availability Source: Other Sources
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