Spectral-Timing Analysis of the Nearby QSO PG1211+143
Abstract
I will present the results of a broad-band spectral-timing analysis of PG1211+143; the archetypal source for ultra-fast outflows in AGN. Through the detection of highly-ionized blueshifted absorption lines from Fe K, an ultra-fast outflow is revealed with velocities exceeding 0.1c. A deep 630ks XMM-Newton plus contemporaneous NuSTAR observation has revealed additional complex, multiple-velocity structure in both the soft and hard X-ray bands. The broad-band spectral properties are explored in detail, testing relativistic reflection models and showing that the imprints of physically-realistic wind absorption models are strongly required to match the data in both the soft X-ray and Fe K spectral regions, providing further demonstration of the power of combining the high throughput and resolution of long-look XMM-Newton observations with the unprecedented spectral coverage of NuSTAR. Additionally, I will present complementary timing analysis - in particular, frequency-/energy-dependent X-ray time delays, with well-correlated variations across the XMM-Newton bandpass, with the first detection of a low-frequency hard lag in this source, consistent with the propagating fluctuations model. However, the low-frequency lag behaviour becomes more complex on an inter-orbit basis, suggestive of additional modes of variability. We also detect a high-frequency soft lag peaking at -0.8ks which I discuss in terms of small-scale reverberation.
- Publication:
-
The X-ray Universe 2017
- Pub Date:
- October 2017
- Bibcode:
- 2017xru..conf..129L