[ 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