Modelling the Soft X-ray Excess in E1615+061
نویسندگان
چکیده
منابع مشابه
Origin of the Soft Excess in X-ray Pulsars
The spectra of many X-ray pulsars show, in addition to a power law, a low-energy component that has often been modeled as a blackbody with kTBB ∼ 0.1 keV. However the physical origin of this soft excess has remained a mystery. We examine a sample of well-studied, bright X-ray pulsars, which have been observed using ROSAT, ASCA, Ginga, RXTE, BeppoSAX, Chandra, and XMM-Newton. In particular, we c...
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Aims. We study an anomaly in the X-ray flux (or luminosity) ratio between the Ovii λλ21.6-22.1 triplet and the Oviii Lyα line seen in classical T Tauri stars (CTTS). This ratio is unusually high when compared with ratios for mainsequence and non-accreting T Tauri stars (Telleschi et al. 2007). We compare these samples to identify the source of the excess. A sample of recently discovered X-ray s...
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The detection of excess of soft X-ray or Extreme Ultraviolet (EUV) radiation, above the thermal contribution from the hot intracluster medium (ICM), has been a controversial subject ever since the initial discovery of this phenomenon. We use a large–scale hydrodynamical simulation of a concordance ΛCDM model, to investigate the possible thermal origin for such an excess in a set of 20 simulated...
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The X-ray spectra of many active galactic nuclei (AGN) exhibit a ‘soft excess’ below 1 keV, whose physical origin remains unclear. Diverse models have been suggested to account for it, including ionised reflection of X-rays from the inner part of the accretion disc, ionised winds/absorbers, and Comptonisation. The ionised reflection model suggests a natural link between the prominence of the so...
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XMM-Newton observations of seven QSOs are presented and the EPIC spectra analysed. Five of the AGN show evidence for Fe Kα emission, with three being slightly better fitted by lines of finite width; at the 99 per cent level they are consistent with being intrinsically narrow, though. The broad-band spectra can be well modelled by a combination of different temperature blackbodies with a power-l...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1994
ISSN: 0074-1809
DOI: 10.1017/s0074180900175229