An XMM-Newton view of the 'bare' nucleus of Fairall 9

被引：30

作者：

Emmanoulopoulos, D. ^{[1
]}

Papadakis, I. E. ^{[2
,3
,4
]}

McHardy, I. M. ^{[1
]}

Nicastro, F. ^{[4
,5
]}

Bianchi, S. ^{[4
,6
,7
]}

Arevalo, P. ^{[8
]}

机构：

[1] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

[2] Univ Crete, Dept Phys, Iraklion 71003, Greece

[3] Univ Crete, Inst Theoret & Computat Phys, Iraklion 71003, Greece

[4] Fdn Res & Technol, IESL, Iraklion 71110, Greece

[5] Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, Italy

[6] Univ Roma Tre, Dipartimento Fis, I-00146 Rome, Italy

[7] Osserv Astron Brera, INAF, I-23807 Merate, Italy

[8] Univ Andres Bello, Dept Ciencias Fis, Santiago, Chile

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2011年 / 415卷 / 02期

基金：

英国科学技术设施理事会;

关键词：

black hole physics; galaxies: individual: Fairall 9; galaxies: nuclei; galaxies: Seyfert; X-rays: galaxies; ACTIVE GALACTIC NUCLEI; BLACK-HOLE SPIN; X-RAY-SPECTRUM; SEYFERT-GALAXIES; IRON LINE; CHANDRA OBSERVATIONS; ENERGY EXTRACTION; ALPHA PROFILE; EMISSION-LINE; TON S180;

D O I：

10.1111/j.1365-2966.2011.18834.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the spectral results from a 130-ks observation, obtained from the X-ray Multi-Mirror Mission-Newton (XMM-Newton) observatory, of the type I Seyfert galaxy Fairall 9. An X-ray hardness ratio analysis of the light curves reveals a 'softer-when-brighter' behaviour which is typical of radio-quiet type I Seyfert galaxies. Moreover, we analyse the high spectral resolution data of the reflection grating spectrometer and we do not find any significant evidence supporting the presence of warm absorber in the low X-ray energy part of the source's spectrum. This means that the central nucleus of Fairall 9 is 'clean' and thus its X-ray spectral properties probe directly the physical conditions of the central engine. The overall X-ray spectrum in the 0.5-10 keV energy range, derived from the EPIC data, can be modelled by a relativistically blurred disc reflection model. This spectral model yields for Fairall 9 an intermediate black hole best-fitting spin parameter of alpha = 0.39(-0.30)(+0.48).

引用

页码：1895 / 1906

页数：12

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