The Soft X-ray View of Ultra Fast Outflows
Date Issued
2017
Author(s)
Reeves, J.
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Matzeu, G.
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Lobban, A.
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Costa, M.
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Pounds, K.
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Behar, E.
Abstract
The recent large XMM-Newton programmes on the nearby quasars PDS 456 and PG 1211+143 have revealed prototype ultra fast outflows in the iron K band through highly blue shifted absorption lines. The wind velocities are in excess of 0.1c and are likely to make a significant contribution to the host galaxy feedback. Here we present evidence for the signature of the fast wind in the soft X-ray band from these luminous quasars, focusing on the spectroscopy with the RGS. In PDS 456, the RGS spectra reveal the presence of soft X-ray broad absorption line profiles, which suggests that PDS 456 is an X-ray equivalent to the BAL quasars, with outflow velocities reaching 0.2c. In PG 1211, the soft X-ray RGS spectra show a complex of several highly blue shifted absorption lines over a wide range of ionisation and reveal outflowing components with velocities between 0.06-0.17c. For both quasars, the soft X-ray absorption is highly variable, even on timescales of days and is most prominent when the quasar flux is low. Overall the results imply the presence of a soft X-ray component of the ultra fast outflows, which we attribute to a clumpy or inhomogeneous phase of the disk wind.
Coverage
The X-ray Universe 2017
Start page
188
Conferenece
The X-ray Universe 2017
Conferenece place
Rome, Italy
Conferenece date
6-9 June, 2017
Ads BibCode
2017xru..conf..188R
Rights
open.access
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