T
T. J. Turner
Researcher at University of Maryland, Baltimore County
Publications - 121
Citations - 7629
T. J. Turner is an academic researcher from University of Maryland, Baltimore County. The author has contributed to research in topics: Galaxy & Active galactic nucleus. The author has an hindex of 49, co-authored 121 publications receiving 7373 citations. Previous affiliations of T. J. Turner include Universities Space Research Association & Goddard Space Flight Center.
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Journal ArticleDOI
ASCA observations of Seyfert 1 galaxies: II. Relativistic Iron K-alpha emission
TL;DR: In this paper, the authors present evidence for widespread relativistic effects in the central regions of active galactic nuclei, including the presence of supermassive black holes in the centers of active galaxies.
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X-ray Spectral Variability and Rapid Variability of the Soft X-ray Spectrum Seyfert 1 Galaxies Ark 564 and Ton S180
Rick Edelson,Rick Edelson,T. J. Turner,T. J. Turner,Ken Pounds,Simon Vaughan,Simon Vaughan,Alex Markowitz,Herman L. Marshall,Paul Dobbie,R. S. Warwick +10 more
TL;DR: In this article, the authors studied the variability of the soft Seyfert spectrum for 35 days and 12 days with ASCA and RXTE, with no evidence of lags between any of the energy bands studied, and the fractional variability amplitude was almost independent of energy band.
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ASCA Observations of Seyfert 1 galaxies: III. The Evidence for Absorption & Emission due to Photoionized Gas
TL;DR: In this paper, a detailed analysis of the 0.6 - 10 keV spectra of 23 ASCA observations of 18 objects was carried out, and it was shown that the column densities of ionized material are typically in the range N{H,z} approx 10^{21}--10^{23} cm^{-2}, although highly ionized column density up to 10^{24} cm−2} cannot be excluded in some cases.
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The Ionized Gas and Nuclear Environment in NGC 3783. I. Time-Averaged 900 ks Chandra Grating Spectroscopy
Shai Kaspi,W. N. Brandt,Ian M. George,H. Netzer,D. M. Crenshaw,Jack R. Gabel,Fred Hamann,Mary Elizabeth Kaiser,A. Koratkar,S. B. Kraemer,Gerard A. Kriss,S. Mathur,R. F. Mushotzky,K. Nandra,Bradley M. Peterson,J. C. Shields,T. J. Turner,WeiKang Zheng +17 more
TL;DR: In this paper, the authors present results from a 900 ks exposure of NGC 3783 with the High-Energy Transmission Grating Spectrometer on board the Chandra X-ray Observatory.
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The Ionized Gas and Nuclear Environment in NGC 3783. IV. Variability and Modeling of the 900 ks CHANDRA Spectrum
H. Netzer,Shai Kaspi,Etienne Behar,W. N. Brandt,D. Chelouche,Ian M. George,D. M. Crenshaw,Jack R. Gabel,Fred Hamann,S. B. Kraemer,Gerard A. Kriss,K. Nandra,Bradley M. Peterson,J. C. Shields,T. J. Turner +14 more
TL;DR: A detailed spectral analysis of the data obtained from NGC 3783 during the period 2000-2001 using Chandra was presented in this article, which led to the following results: 1) The spectral variations are not related to the brightening or the fading of the continuum at short wavelengths in any simple way.