[ Joint Center for Astrophysics]
Studies of AGN underway within the JCA

Most of the studies currently underway within the JCA are associated with X-ray & Gamma-ray observations, although complementary radio, infrared, optical and ultra-violet observations are often also used.

In particluar, many of the recent studies have focused on Seyfert Galaxies

and on the jets in Radio Galaxies & Blazars.

A number of the members of the JCA study various aspects of Active Galactic Nuclei. These include:

James Chiang - theoretical studies of X-ray & Gamma-ray reprocessing, and accretion disk winds.
Ian George - observational & interpretational studies of X-ray & Gamma-ray reprocessing, and photoionized gas.
Eric Perlman - observational & interpretational studies of blazars, the evolution of active galaxies, and the physics of jets
Jane Turner - observational & interpretational studies of X-ray & Gamma-ray reprocessing, and photoionized gas.

Recent Results

Some recent include (see also Full List of JCA publications)

The Ionized Gas and Nuclear Environment in NGC 3783. II. Averaged HST/STIS and FUSE Spectra: Gabel, J.R., Crenshaw, D.M., Kraemer, S., Brandt, W.N., George, I.M. Netzer, H. Hamann, F.W., Kaiser, M.E., Kaspi, S., Koratkar, A., Kriss, G.A., Mathur, S., Mushotzky, R.F., Nandra, K., Peterson, B.M., Shields, J.C., Turner, T.J., Zheng, W.,; 2002, ApJ, in press

The Kinematics and Physical Conditions of the Ionized Gas in Markarian 509. II. STIS Echelle Observations: Kraemer, S., Crenshaw, D.M., Yaqoob, T., McKernan, B., Gabel, J.R., George, I.M., Turner, T.J., Dunn, J.P.; 2002, ApJ, submitted
The Kinematics and Physical Conditions of the Ionized Gas in Markarian 509. I. Chandra High-Energy Grating Spectroscopy: Yaqoob, T., McKernan, B., Kraemer, S., Crenshaw, D.M., Gabel, J.R., George, I.M., Turner, T.J.; 2002, ApJ, submitted
Variable UV Absorption in the Seyfert 1 Galaxy NGC 3516: The Case for Associated UV and X-ray Absorption: Kraemer, S., Crenshaw, D.M., George, I.M. Netzer, H. Turner, T.J., Gabel, J.R.,; 2002, ApJ, 577, 98

The Ionized Gas and Nuclear Environment in NGC 3783. I. Time-averaged 900 ks Chandra Grating Spectroscopy: Kaspi, S., Brandt, W.N., George, I.M. Netzer, H. Crenshaw, D.M., Gabel, J.R., Hamann, F.W., Kaiser, M.E., Koratkar, A., Kraemer, S., Kriss, G.A., Mathur, S., Mushotzky, R.F., Nandra, K., Peterson, B.M., Shields, J.C., Turner, T.J., Zheng, W.,; 2002, ApJ, 574, 643

Narrow Components within the Fe Kalpha Profile of NGC 3516: Evidence for the Importance of General Relativistic Effects?: Turner, T.J., Mushotzky, R.F., Yaqoob, T., George, I.M. Snowden, S.L., Netzer, H. Kraemer, S., Nandra, K., Chelouche, D.,; 2002, ApJ, 574, L123

The Detection of Circumnuclear X-ray Emission from the Seyfert Galaxy NGC 3516: George, I.M. Turner, T.J., Netzer, H. Kraemer, S., Ruiz, J., Chelouche, D., Crenshaw, D.M., Yaqoob, T., Nandra, K., Mushotzky, R.F.,; 2002, ApJ, 571, 265

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Comments or questions to ian.george@umbc.edu