8 papers
New Chandra/HST-STIS results on Seyfert I AGN: Photoionized Outflows
B. McKernan, T. Yaqoob
We present soft X-ray results from observations with the Chandra HETGS of the Seyfert I AGN NGC 4593 and Mrk 509. We discuss the photoionized outflows associated with Seyfert I AGN…
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…
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…
What Kind of Obscured AGN Make the Cosmic X-ray Background?
T. Yaqoob
While it is understood that the origin of the Cosmic X-ray Background (CXRB) can be explained in terms of a combination of obscured and unobscured AGN, the identity of these obscur…
Short-timescale Variability in the Broadband Emission of the Blazars Mkn421 and Mkn501
M. J. Carson, B. McKernan, T. Yaqoob +1
We analyse ASCA x-ray data and Whipple γ-ray data from the blazars Mkn421 and Mkn501 for short-timescale variability. We find no evidence for statistically significant (>3σ) variab…