5 papers
Chandra High-Resolution X-ray Spectroscopy of the Fe K Line in the Seyfert 1 Galaxy NGC 3783
T. Yaqoob, J. N. Reeves, A. Markowitz +2
We report on the results of detailed X-ray spectroscopy of the Fe K region in the Seyfert 1 galaxy NGC 3783 from five ~170 ks observations with the Chandra high energy gratings. Mo…
The Cores of the Fe K Lines in Seyfert I Galaxies Observed by the Chandra High Energy Grating
Tahir Yaqoob, Urmila Padmanabhan
We report on the results of 18 observations of the core, or peak, of the Fe K emission line at keV in 15 Seyfert I galaxies using the {\it Chandra} High Energy Grating (…
Fe XXV and Fe XXVI Diagnostics of the Black Hole and Accretion Disk in Active Galaxies: Chandra Time-Resolved Spectroscopy of NGC 7314
T. Yaqoob, I. M. George, T. R. Kallman +3
We report the detection of Fe XXV and Fe XXVI emission lines from a Chandra HETGS observation of the Seyfert~1 galaxy NGC 7314, made simultaneously with RXTE. The lines are re…
Chandra Grating Observations of AGN
T. Yaqoob, U. Padmanabhan
The highest spectral resolution data for the Fe-K lines in type I AGN, as observed with the Chandra High Energy Grating (HEG), reveal a variety of line shapes. However, the energie…
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…