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The Effect of Changes in the ASCA Calibration on the Fe-Kalpha Lines in Active Galaxies
T. Yaqoob, U. Padmanabhan, T. Dotani +1
The ASCA calibration has evolved considerably since launch and indeed, is still evolving. There have been concerns in the literature that changes in the ASCA calibration have resul…
The Detection of Circumnuclear X-ray Emission from the Seyfert Galaxy NGC 3516
I. M. George, T. J. Turner, H. Netzer +7
We present the first high-resolution, X-ray image of the circumnuclear regions of the Seyfert 1 galaxy NGC 3516, using the Chandra X-ray Observatory (CXO). All three of the CXO obs…
The Spectral Energy Distribution of the Seyfert galaxy Ton S180
T. J. Turner, P. Romano, S. B. Kraemer +14
We present spectral results from a multi-satellite, broad-band campaign on the Narrow-line Seyfert 1 galaxy Ton S180 performed at the end of 1999. We discuss the spectral-energy di…
Chandra Grating Observations of Seyfert 1 Galaxies
T. Yaqoob, I. M. George, T. J. Turner
We present new results from a Chandra HETG observation of NGC 5548 and give a comparison of absorption and emission features found in other Seyfert 1 galaxies using Chandra grating…
Subtleties in Measuring Iron K Lines in AGN
T. Yaqoob, U. Padmanabhan, T. Dotani +3
Chandra and XMM observations are showing that the Fe-K emission lines in type 1 AGN are composite, in general consisting of a narrow and a broad component. We review the latest Cha…
Quasi-Periodic Oscillation in Seyfert galaxies: Significance levels. The Case of Mrk 766
S. Benlloch, J. Wilms, R. Edelson +2
We discuss methods to compute significance levels for the existence of quasi-periodic oscillations (QPOs) in Active Galactic Nuclei (AGN) which take the red-noise character of the…
The X-ray Emission from the Nucleus of the Dwarf Elliptical Galaxy NGC 3226
I. M. George, R. F. Mushotzky, T. Yaqoob +6
We present the first high resolution X-ray image of the dwarf elliptical galaxy NGC 3226. The data were obtained during an observation of the nearby Seyfert Galaxy NGC 3227 using t…