Broadband short term X-ray variability of the quasar PDS 456

被引：4

作者：

Matzeu, G. A. ^{[1
]}

Reeves, J. N. ^{[1
,2
]}

Nardini, E. ^{[1
]}

Braito, V. ^{[3
]}

Costa, M. T. ^{[1
]}

Tombesi, F. ^{[4
,5
,6
]}

Gofford, J. ^{[1
]}

机构：

[1] Keele Univ, Sch Phys & Geog Sci, Astrophys Grp, Keele ST5 5BG, Staffs, England

[2] Univ Maryland Baltimore Cty, Ctr Space Sci & Technol, 1000 Hilltop Circle, Baltimore, MD 21250 USA

[3] Osserv Astron Brera, INAF, Via Bianchi 46, I-23807 Merate, LC, Italy

[4] NASA, Goddard Space Flight Ctr, Xray Astrophys Lab, Greenbelt, MD 20771 USA

[5] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[6] Univ Maryland, CRESST, College Pk, MD 20742 USA

来源：

ASTRONOMISCHE NACHRICHTEN | 2016年 / 337卷 / 4-5期

基金：

英国科学技术设施理事会;

关键词：

Black hole physics; galaxies: active; galaxies: nuclei; quasars: individual (PDS 456); X-rays: galaxies; ULTRA-FAST OUTFLOWS; LUMINOUS QUASAR; BLACK-HOLES; GALAXIES; DISCOVERY; ABSORBER; FEEDBACK; SAMPLE; SUZAKU; VIEW;

D O I：

10.1002/asna.201612336

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a detailed analysis of a recent 500 ks net exposure Suzaku observation, carried out in 2013, of the nearby (z = 0.184) luminous (L-bol similar to 10(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. similar to 0.25c, 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-g in PDS 456. (C) 2016 WILEY-VCH Verlag GmbH&Co. KGaA, Weinheim

引用

页码：495 / 499

页数：5

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