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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28415
Title: Broadband short term variability of the quasar PDS 456
Authors: Matzeu, G. A.
Reeves, J. N.
Nardini, E.
Braito, V. 
Costa, M. T.
Tombesi, Francesco 
Gofford, J.
Issue Date: 2016
Journal: ASTRONOMISCHE NACHRICHTEN 
Number: 337
Issue: 4-5
First Page: 495
Abstract: We present a detailed analysis of a recent $500$ ks net exposure \textit{Suzaku} observation, carried out in 2013, of the nearby ($z=0.184$) luminous (L$_{\rm bol}\sim10^{47}$ erg s$^{-1}$) quasar PDS 456 in which the X-ray flux was unusually low. The short term X-ray spectral variability has been interpreted in terms of variable absorption and/or intrinsic continuum changes. In the former scenario, the spectral variability is due to variable covering factors of two regions of partially covering absorbers. We find that these absorbers are characterised by an outflow velocity comparable to that of the highly ionised wind, i.e. $\sim0.25$ c, at the $99.9\%$ $(3.26\sigma)$ confidence level. This suggests that the partially absorbing clouds may be the denser clumpy part of the inhomogeneous wind. Following an obscuration event we obtained a direct estimate of the size of the X-ray emitting region, to be not larger than $20~R_{\rm g}$ in PDS 456.
URI: http://hdl.handle.net/20.500.12386/28415
URL: http://arxiv.org/abs/1604.05891v1
https://onlinelibrary.wiley.com/doi/abs/10.1002/asna.201612336
ISSN: 0004-6337
DOI: 10.1002/asna.201612336
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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