منابع مشابه
The complex soft X - ray spectrum of NGC 4151
We present a detailed analysis of the complex soft X-ray spectrum of NGC 4151 measured by the RGS instruments aboard XMM-Newton. The XMM-Newton RGS spectra demonstrate that the soft X-ray emission is extremely rich in X-ray emission lines and radiative recombination continua (RRC), with no clear evidence for any underlying continuum emission. Line emission, and the associated RRC, are clearly d...
متن کاملIron K features in the hard X - ray XMM - Newton spectrum of NGC 4151
Recent XMM-Newton observations have measured the hard (2.5-12 keV) X-ray spectrum of the well-known Seyfert galaxy NGC 4151 with a signal-to-noise unprecedented for this source. We find that a spectral model, developed to fit previous Bep-poSAX and ASCA observations of NGC 4151, provides an excellent description of the XMM-Newton EPIC data. The results support the view that it is the level of t...
متن کاملRelativistic iron K X-ray reverberation in NGC 4151
Recent X-ray observations have enabled the study of reverberation delays in active galactic nuclei (AGN) for the first time. All the detections so far are in sources with a strong soft excess, and the measured delay is between the hard (1–3 keV) direct continuum and the soft excess (0.5–1 keV), interpreted as the reflection continuum smeared by relativistic effects. There is however an inherent...
متن کاملOrigin of the “ Disk - Line ” Feature in the X - Ray Energy Spectrum of a Seyfert Galaxy , NGC 4151
We have studied the origin of the broad and skewed feature at 4.5–7.5 keV in the energy spectra of NGC 4151 using the ASCA and RXTE data. The feature consists of a narrow peak at 6.4 keV and a broad wing extended between 4.5–7.5 keV. An analysis of the long-term variations revealed that the feature became variable only on a time scale longer than 1.5× 10 s. Through a comparison with the continu...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1986
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/218.4.685