A New X-Ray Flare from the Galactic Nucleus Detected with XMM-Newton

被引：0

作者：

Goldwurm, A. ^{[1
]}

Brion, E. ^{[2
]}

Goldoni, P. ^{[1
]}

Ferrando, P. ^{[1
]}

Daigne, F. ^{[1
]}

Decourchelle, A. ^{[1
]}

Warwick, R. S. ^{[3
]}

Predehl, P. ^{[4
]}

机构：

[1] CEA Saclay, Serv Astrophys, DAPNIA DSM CEA, F-91191 Gif Sur Yvette, France

[2] Ctr Etud Nucl Bordeaux Gradignan, F-33175 Gradignan, France

[3] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

[4] Max Planck Inst Extraterr Phys, D-85741 Garching, Germany

来源：

ASTRONOMISCHE NACHRICHTEN | 2003年 / 324卷

关键词：

Accretion; accretion disks; Black hole physics; Galaxy: center; X-rays: general;

D O I：

10.1002/asna.200385041

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The compact radio source Sgr A*, believed to be the counterpart of the massive black hole at the Galactic nucleus, was observed to undergo rapid and intense flaring activity in X-rays with Chandra in October 2000. We report here the detection with XMM-Newton EPIC cameras of the early phase of a similar X-ray flare from this source, which occurred on 2001 September 4. The source 2-10 keV luminosity increased by a factor approximate to 20 to reach a level of 4 10(34) erg s(-1) in a time interval of about 900 s, just before the end of the observation. The data indicate that the source spectrum was hard during the flare and can be described by simple power law of slope approximate to 0.7. This XMM-Newton observation confirms the results obtained by Chandra, suggests that, in Sgr A*, rapid and intense X-ray flaring is not a rare event and therefore sets some constraints on the emission mechanism models proposed for this source.

引用

页码：377 / 382

页数：6

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