The Suzaku View of Highly Ionized Outflows in AGN. 1; Statistical Detection and Global Absorber Properties
By J. Gofford, J. Reeves, F. Tombesi, V. Braito, T. Turner, L. Miller, M. Cappi. 2012
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We present the results of a new spectroscopic study of Fe K-band absorption in Active Galactic Nuclei (AGN). Using data obtained from the Suzaku public archive we have performed a statistically driven blind search for Fexxv He and/or Fexxvi Ly absorption lines in a large sample of 51 type 1:0 1:9 AGN. Through extensive Monte Carlo simulations we nd that statistically signicant absorption is detected at E & 6:7 keV in 20/51 sources at the PMC > 95% level, which corresponds to 40% of the total sample. In all cases, individual absorption lines are detected independently and simultaneously amongst the two (or three) available XIS detectors which conrms the robustness of the line detections. The most frequently observed outow phenomenology consists of two discrete absorption troughs corresponding to Fexxv He and Fexxvi Ly at a common velocity shift. From xstar tting the mean column density and ionisation parameter for the Fe K absorption components are log(NH=cm 2 ) 23 and log(= erg cm s 1 ) 4:5, respectively. Measured outow velocities span a continuous range from < 1; 500 km s 1 up to 100; 000 km s 1 , with mean and median values of 0:1 c and 0:056 c, respectively. The results of this work are consistent with those recently obtained using XMM-Newton and independently provides strong evidence for the existence of very highly-ionised circumnuclear material in a signicant fraction of both radio-quiet and radio-loud AGN in the local universe.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/af4419f70e027424f64f9346ee59c31be9a2a4d8
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Citations in the corpus
- Powerful Outflows and Feedback from Active Galactic Nuclei (2015, background): “A similar search of the Suzaku data archive (Gofford et al. 2013) yielded a further group of UFO detections, finding significant absorption in the Fe K band in 20 (of 51) AGN with velocities up to ∼ 0.3c and a flatter distribution than the XMM-Newton sample, but a median value again v∼ 0.1c. Figure…”
- BAT AGN Spectroscopic Survey. V. X-Ray Properties of the Swift/BAT 70-month AGN Catalog (2017, background): “The analysis of high-quality Suzaku and XMMNewton spectra has additionally pointed out that some objects also show highly ionized outflows with velocities exceeding 10,000 km s−1, the so-called ultra-fast outflows (e.g., Tombesi et al. 2010a,b; Gofford et al. 2013).”