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| Paper: |
A Study of the X-ray Outflow of APM 08279+5255 |
| Volume: |
460, AGN Winds in Charleston |
| Page: |
39 |
| Authors: |
Saez, C.; Chartas, G. |
| Abstract: |
We present results from multi-epoch spectral analysis of Chandra, XMM-Newton, and Suzaku observations of the z =
3.91 gravitationally-lensed broad absorption line (BAL) quasar APM
08279+5255. These results are obtained from spectral fits to all the
long exposure (∼100 ks) observations using a new quasar-outflow
photoionization model of a near-relativistic outflow. In every
observation, we confirm the presence of two strong features, one at
rest-frame energies between 1–4 keV, and the other between
7–18 keV. We interpret the low-energy (1–4 keV rest-frame)
absorption as arising from a low-ionization absorber with log NH ∼ 23 (CGS units) and the high-energy absorption
(7–18 keV rest-frame) as due to lines arising from highly ionized
(2.75 < log ℰ < 4.0; where ℰ is the ionization
parameter) iron in a near-relativistic outflowing wind. We find that
the velocities in the outflow could get up to 0.7c. Our results also
suggest that changes in the SED could be related to changes in the
terminal velocities of the outflow. We also present results obtained
from CLOUDY simulations; the main objective of these simulations
is to better constrain the physical properties of the outflowing
X-ray absorbing gas. |
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