منابع مشابه
Spectral - timing evidence for a Very High State in the Narrow Line Seyfert 1 Ark 564
We use a 100 ks long XMM-Newton observation of the Narrow-Line Seyfert 1 galaxy Ark 564 and combine it with the month-long monitoring of the same source produced by ASCA, to calculate the phase lags and coherence between different energy bands, over frequencies ∼ 10 to 10 Hz. This is the widest frequency range for which these spectral-timing properties have been calculated accurately for any AG...
متن کاملEvidence for an ionised disc in the narrow - line Seyfert 1 galaxy Ark 564
We present simultaneous ASCA and RXTE observations of Ark 564, the brightest known ‘narrow-line’ Seyfert 1 in the 2–10 keV band. The measured X-ray spectrum is dominated by a steep (Γ ≈ 2.7) power-law continuum extending to at least 20 keV, with imprinted Fe K-line and -edge features and an additional ‘soft excess’ below ∼ 1.5 keV. The energy of the iron K-edge indicates the presence of highly ...
متن کاملOn the Nature of X - ray Variability in Ark 564
We use data from a recent long ASCA observation of the Narrow Line Seyfert 1 galaxy Ark 564 to investigate in detail its timing properties. We show that a thorough analysis of the time series, employing techniques not generally applied to AGN light curves, can provide useful information to characterize the engines of these powerful sources. We searched for signs of non–stationarity in the data,...
متن کاملThe Narrow-line Region of Seyfert Galaxies: Narrow-line Seyfert 1s versus Broad-line Seyfert 1s
It is known that the spectral energy distribution (SED) of the nuclear radiation of narrow-line Seyfert 1 galaxies (NLS1s) has different shapes with respect to that of ordinary broad-line Seyfert 1 galaxies (BLS1s), particularly in wavelengths of X-ray. This may cause some differences in the ionization degree and the temperature of gas in narrow-line regions (NLRs) between NLS1s and BLS1s. This...
متن کاملThe Resolved Narrow Line Region in NGC41511
We present slitless spectra of the Narrow Line Region (NLR) in NGC 4151 from the Space Telescope Imaging Spectrograph (STIS) on HST, and investigate the kinematics and physical conditions of the emission line clouds in this region. Using medium resolution (∼ 0.5 Å) slitless spectra at two roll angles and narrow band undispersed images, we have mapped the NLR velocity field from 1.2 kpc to withi...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2003
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20030893