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Discovery of a Cyclotron Resonance Scattering Feature in the X-ray Spectrum of XTE J1946+274 | | W.A. Heindl
; W. Coburn
; D.E. Gruber
; R.E. Rothschild
; I. Kreykenbohm
; J. Wilms
; R. Staubert
; | | Date: |
20 Dec 2001 | | Journal: | ApJL, 563:L35-L39, 2001 December 10 | | Subject: | astro-ph | | Affiliation: | UC, San Diego) and I. Kreykenbohm, J. Wilms, R. Staubert (IAA Tuebingen | | Abstract: | Observations of the transient accreting pulsar XTE J1946+274 made with the Rossi X-ray Timing Explorer during the course of the 1998 September-November outburst, reveal a cyclotron resonance scattering feature (or "cyclotron line") in the hard X-ray spectrum near 35 keV. We determine a centroid energy of 36.2 +0.5/-0.7 keV, which implies a magnetic field strength of 3.1(1+z)x10^12 G, where z is the gravitational redshift of the scattering region. The optical depth, Tau = 0.33 +0.07/-0.06, and width, sigma = 3.37 +0.92/-0.75 keV, are typical of known cyclotron lines in other pulsars. This discovery makes XTE J1946+274 one of thirteen pulsars with securely detected cyclotron lines resulting in direct magnetic field measurements. | | Source: | arXiv, astro-ph/0112468 | | Services: | Forum | Review | PDF | Favorites | |
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