منابع مشابه
The X-ray emission from broad absorption line quasars
Pointed ASCA observations as well as archival ROSAT data are used for a study of the X-ray emission of the three BAL Quasars LBQS 2212-1759, PG 1411+442, and PG 0043+039. All three objects are found to be X-ray quiet, possibly due to substantial intrinsic absorption with NH > 1023 cm−2 but might have intrinsically a more typical spectral energy distribution. This picture is supported by explici...
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The Galactic supernova remnant W49B has one of the most impressive X-ray emission line spectra obtained with the Advanced Satellite for Cosmology and Astronomy (ASCA). We use both plasma line diagnostics and broadband model fits to show that the Si and S emission lines require multiple spectral components. The spectral data do not necessarily require individual elements to be spatially stratifi...
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We present model X-ray spectra of accreting black holes with advection-dominated accretion flows, paying attention to thermal emission lines from the hot plasma. We show that the Advanced X-ray Astrophysical Facility (AXAF) might be able to observe lines from X-ray binaries such as V404 Cyg in quiescence, the Galactic center black hole Sagittarius A, and the nuclei of nearby galaxies such as M8...
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We show that fast moving isolated fragments of a supernova ejecta composed of heavy elements should be sources of Kα X-ray line emission of the SN nuclear-processed products. Supersonic motion of the knots in the intercloud medium will result in a bow-shock/knot-shock structure creation. Fast nonthermal particles accelerated by Fermi mechanism in the MHD collisionless shocks diffuse through a c...
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Recent observations of X–ray afterglows reveal the presence of a redshifted Kα iron line in emission in four bursts. In GRB 991216, the line was detected by the low energy grating of Chandra, which showed the line to be broad, with a full width of ∼15,000 km s. These observations indicate the presence of a > 1 M⊙ of iron rich material in the close vicinity of the burst, most likely a supernova ...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1979
ISSN: 0004-637X,1538-4357
DOI: 10.1086/183110