Physics & Astronomy Colloquium
3:30 PM, Friday, April 18, 2008
Room 155, Chem-Phys Building
Dr. (Tracey) Jane Turner
NASA/Goddard Space Flight Center
Joint Center for Astrophysics, University of Maryland, Baltimore County
"X-ray Spectroscopy of
Local AGN: What is Really Coming from the Inner Disk?''
New XMM-Newton and Chandra X-ray observations have revealed the presence
of gas zones of much higher ionization-state and column density than
previously known, existing very close to the central black hole.
Consideration of this gas shows it must make a substantial contribution to
the observed X-ray spectral shape and variability; once this is accounted
for our view of the contribution from the inner accretion disk must be
modified significantly. I give a personal perspective on the shifting AGN
paradigm.
Refreshments will be served in CP 179 at 3:15 PM
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