منابع مشابه
The X - Ray Photoionized Wind in Cen X - 3 / V 779 Cen
We analyze the ASCA spectrum of the Cen X-3 X-ray binary system in eclipse using atomic models appropriate to recombination-dominated level population kinetics in an overionized plasma. In order to estimate the wind characteristics, we first fit the eclipse spectrum to a single-zone photoionized plasma model. We then fit spectra from a range of orbital phases using global models of photoionized...
متن کاملThe X - Ray Halo of Cen X - 3
Using two Chandra observations we have determined the dust distribution and distance to the eclipsing high mass X-ray binary (HMXB) Cen X-3 using the energy-resolved dust-scattered X-ray halo. By comparing the observed X-ray halos in 200 eV bands from 2–5 keV to the halo profiles predicted by the Weingartner & Draine interstellar grain model, we find that the vast majority (≈70%) of the dust al...
متن کاملThe Variable Quiescence of Cen X - 4
Cen X-4 is one of the best studied low-mass neutron star transients in quiescence. Thanks to XMM-Newton large throughput, Cen X-4 was observed at the highest signal to noise ever. This allowed us to disclose rapid (> 100 s), large (45 ± 7 rms in the 10 −4 − 1 Hz range) intensity variability, especially at low energies. In order to highlight the cause of this variability, we divided the data int...
متن کاملBeppoSAX detection of a Cyclotron Feature in the spectrum of Cen X-3
The High Mass X-ray Binary Pulsar Centaurus X-3 was observed by the BeppoSAX satellite during 1997 February 17, while the system was in a high-luminosity (Lx = 4.3 · 1037 erg s−1) post-egress state. In this Letter we report the detection of an absorption-like feature, centered at ∼28 keV, in the broad band phase averaged spectrum. Interpreting the feature as due to cyclotron resonant scattering...
متن کاملBeppoSAX observation of Cen X-4 in quiescence
We report on a 61 ks BeppoSAX observation of the soft X–ray transient Cen X-4 during quiescence which allowed to study the source X–ray spectrum from ∼ 0.3 keV to ∼ 8 keV. A two-component spectral model was required, consisting of a black body with temperature of ∼ 0.1 keV and a power law with photon index ∼ 2. These values are compatible with earlier ASCA results indicating that Cen X-4 may be...
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ژورنال
عنوان ژورنال: Nature Physical Science
سال: 1972
ISSN: 0300-8746,2058-1106
DOI: 10.1038/physci237104a0