Towards an informed quest for accretion disc winds in quasars: the intriguing case of Ton 28
Date Issued
2019
Author(s)
Abstract
We report on the detection of a blueshifted Fe K absorption feature in two
consecutive XMM-Newton observations of the luminous blue quasar Ton 28, at the
4$\sigma$ cumulative significance. The rest energy of 9.2 keV implies the
presence of an accretion disc wind with bulk outflow velocity of $\sim$0.28$c$,
while the kinetic power is most likely a few per cent of the quasar luminosity.
Remarkably, Ton 28 had been specifically selected as an optimal target to
reveal an ultra-fast X-ray wind based on its total luminosity ($L_{\rm bol} >
10^{46}$ erg s$^{-1}$) and [OIII] $\lambda$5007\AA\ equivalent width (EW < 6
\AA), suggestive of high accretion rate and low inclination, respectively.
Other peculiar optical/UV emission-line properties include narrow H$\beta$,
strong FeII and blueshifted CIV. These are key parameters in the Eigenvector 1
formalism, and are frequently found in active galaxies with ongoing accretion
disc winds, hinting at a common physical explanation. Provided that the
effectiveness of our selection method is confirmed with similar sources, this
result could represent the first step towards the characterization of
black-hole winds through multiwavelength indicators in the absence of
high-quality X-ray spectra.
Volume
482
Issue
1
Start page
L134
Issn Identifier
1745-3925
Ads BibCode
2019MNRAS.482L.134N
Rights
open.access
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