Back to Volume
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.
Back to Volume