Abstract
An extended XMM-Newton observation of the luminous narrow line Seyfert galaxy PG 1211+143 in 2014 has revealed a more complex high velocity wind, with components distinguished in velocity, ionization level, and column density. Here we report soft x-ray emission and absorption features from the ionized outflow, finding counterparts of both high velocity components, v ~ 0.129c and v ~ 0.066c, recently identified in the highly ionized Fe K absorption spectrum. The lower ionization of the co-moving soft x-ray absorbers imply a distribution of higher density clouds embedded in the main outflow, while much higher column densities for the same flow component in the hard x-ray spectra suggest differing sight lines to the continuum x-ray source.
Highlights
The narrow-line Seyfert galaxy PG1211+143 is widely associated with ultra-fast, highly ionized outflows (UFOs), since the first detection in a non-BAL AGN of strongly blue-shifted absorption lines of highly ionized gas, corresponding to a sub-relativistic outflow velocity of 0.15±0.01c (Pounds et al 2003, Pounds and Page 2006)
It is noteworthy that the great majority of UFO detections are based on blue-shifted absorption lines being identified with resonance transitions in Fe XXV and XXVI ions
The present paper reports a corresponding analysis of the 2014 soft x-ray spectrum of PG1211+143 using data from the Reflection Grating Spectrometer (RGS)
Summary
The narrow-line Seyfert galaxy PG1211+143 is widely associated with ultra-fast, highly ionized outflows (UFOs), since the first detection in a non-BAL (broad absorption line) AGN (active galactic nucleus) of strongly blue-shifted absorption lines of highly ionized gas, corresponding to a sub-relativistic outflow velocity of 0.15±0.01c (Pounds et al 2003, Pounds and Page 2006). Archival data from XMMNewton and Suzaku have since shown similar UFOs are relatively common in nearby, luminous AGN (Tombesi et al 2010, 2011; Gofford et al 2013) The frequency of these detections confirms a substantial covering factor - and significant mass and momentum in such winds,with the potential to disrupt star formation in the host galaxy. Pounds et al 2016 (hereafter Paper 1) present an analysis of the hard x-ray spectrum, based on data from the pn camera (Strueder 2001), revealing new spectral structure in Fe K absorption lines, and dual velocities (v∼0.066c and v∼0.129c) in the highly ionized wind. All quoted velocities are corrected for the relativistic Doppler effect
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