Detection of fundamental and first harmonic cyclotron line in X-ray pulsar Cep X-4
نویسندگان
چکیده
منابع مشابه
Luminosity-dependent changes of the cyclotron line energy and spectral hardness in Cep X-4
Context. X-ray spectra of accreting pulsars are generally observed to vary with their X-ray luminosity. In particular, the hardness of the X-ray continuum is found to depend on luminosity. In a few sources, the correlation between the energy of the cyclotron resonance scattering feature (CRSF) and the luminosity is clear. Different types (signs) of the correlation are believed to reflect differ...
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The high-mass X-ray binary and accreting X-ray pulsar IGR J16393−4643 was observed by NuSTAR 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+1.1 −1.3 keV. This allowed us to measure the magnetic field strength of the neutron star for the ...
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We report on the results of the longest uninterrupted observation of the Anomalous X-ray Pulsar 1RXSJ170849−400910 obtained with the BeppoSAX satellite in August 2001. The best fit phase-averaged spectrum was found to be an absorbed power law plus blackbody model, with photon index Γ ∼ 2.4 and a black body temperature of kTbb ∼ 0.4 keV. We confirm the presence of significant spectral variations...
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The long-term ( 1.5 yr) X-ray enhancement and the accompanying infrared enhancement light curves of the anomalous X-ray pulsar 1E 2259+586 following the major bursting epoch can be accounted for by the relaxation of a fallback disk that has been pushed back by a gamma-ray flare. The required burst energy estimated from the results of our model fits is low enough for such a burst to have remaine...
متن کاملOn the cyclotron line in Cepheus X-4
Context. Accreting X-ray pulsars provide us with laboratories for the study of extreme gravitational and magnetic fields, hence accurate descriptions of their observational properties contribute to our understanding of this group of objects. Aims. We aim to detect a cyclotron resonance scattering feature in the Be/X-ray binary Cep X-4 and to investigate pulse profile and spectral changes throug...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society: Letters
سال: 2015
ISSN: 1745-3925,1745-3933
DOI: 10.1093/mnrasl/slv093