منابع مشابه
Characterising the complex absorber in NGC 4151
We present a detailed analysis of the complex absorption apparent in the 2–6 keV X-ray spectrum of the bright nearby Seyfert galaxy NGC 4151. We first utilize the large bandpass and medium spectral resolution afforded by BeppoSAX data to construct a 1–100 keV spectral template, which assumes the absorption arises in both warm (i.e. partially photoionized) and cold gas present in the line of sig...
متن کاملBalmer emission - line profile variations in NGC 4593
We present results of a variability campaign of Balmer line profiles inNGC 4593. The continuumand the broad emission line intensities varied up to 50 per cent during the observing period. The rms profiles of the Balmer lines as well as the difference line profiles can be described by a limited number of strong components only: a central component and two to four outer components which are locat...
متن کاملThe recent history of the X - ray absorber in NGC 3516
We present two BeppoSAX observations of the bright Seyfert 1 galaxy NGC3516, performed four months apart (late 1996/early 1997). The earlier spectrum is considerably weaker and harder in the whole 0.1–50 keV energy range. In addition, the warm absorber oxygen features, which were already observed with ROSAT (Mathur et al. 1997) and ASCA (Kriss et al. 1996), are much less pronounced. The most st...
متن کاملASCA Observations of the Composite Warm Absorber in NGC 3516
We obtained X-ray spectra of the Seyfert 1 galaxy NGC 3516 in March 1995 using the Japanese X-ray satellite ASCA. Simultaneous far-UV observations were obtained with the Hopkins Ultraviolet Telescope on the Astro-2 shuttle mission. The ASCA spectrum shows a lightly absorbed power law of energy index 0.78. The low energy absorbing column is signiicantly less than previously seen. Prominent O vii...
متن کاملEnergy Dependent Time Lags in the Seyfert 1 Galaxy Ngc 4593
We investigate the energy-time lag dependence of the source NGC 4593 using XMM-Newton/EPIC-pn data. We found that the time lag dependency is linear in nature with respect to the logarithm of different energy bands. We also investigate the frequency dependent time lags and identify that at some frequency range (5 × 10−5 Hz – 2 × 10−4 Hz) the X-ray emission is highly coherent, mildly frequency de...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2013
ISSN: 1365-2966,0035-8711
DOI: 10.1093/mnras/stt1497