| タイトル | A Compton-thick Wind in the High Luminosity Quasar, PDS 456 |
| 本文（外部サイト） | http://hdl.handle.net/2060/20090012438 |
| 著者（英） | Braito, V.; Reeves, J. N.; Miller, L.; Fabian, A. C.; Kaspi, S.; Mushotzky, R.; Behar, E.; Ward, M.; Turner, T. J.; O'Brien, P. T. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2009-01-01 |
| 言語 | eng |
| 内容記述 | PDS 456 is a nearby (z=0.184), luminous (L(sub bol) approximately equal to 10(exp 47) ergs(exp -1) type I quasar. A deep 190 ks Suzaku observation in February 2007 revealed the complex, broad band X-ray spectrum of PDS 456. The Suzaku spectrum exhibits highly statistically significant absorption features near 9 keV in the quasar rest-frame. We show that the most plausible origin of the absorption is from blue-shifted resonance (1s-2p) transitions of hydrogen-like iron (at 6.97 keV in the rest frame). This indicates that a highly ionized outflow may be present moving at near relativistic velocities (0.26-0.31c). A possible hard X-ray excess is detected above 15 keV with HXD (at 99.8% confidence), which may arise from high column density gas (N(sub H) greater than 10(exp 24)cm(exp -2) partially covering the X-ray emission, or through strong Compton reflection. Here we propose that the iron K-shell absorption in PDS 456 is associated with a thick, possibly clumpy outflow, covering about 20% of 4(pi) steradian solid angle. The outflow is likely launched from the inner accretion disk, within 15-100 gravitational radii of the black hole. The kinetic power of the outflow may be similar to the bolometric luminosity of PDS 456. Such a powerful wind could have a significant effect on the co-evolution of the host galaxy and its supermassive black hole, through feedback. |
| NASA分類 | Astrophysics |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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