Discovery of a tidal disruption event candidate from the 2XMM catalog

被引：0

作者：

Lin, D. ^{[1
,2
,3
]}

Carrasco, E. R. ^{[4
]}

Grupe, D. ^{[5
]}

Webb, N. A. ^{[1
,2
]}

Barret, D. ^{[1
,2
]}

Farrell, S. A. ^{[6
]}

机构：

[1] CNRS, IRAP, 9 Ave Colonel Roche,BP 44346, F-31028 Toulouse 4, France

[2] Univ Toulouse, UPS OMP, IRAP, Toulouse, France

[3] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA

[4] Southern Operat Ctr, Gemini Observ AURA, Casilla 603, La Serena 603, Chile

[5] Penn State Univ, Dept Astron & Astrophys, Davey Lab, University Pk, PA 16802 USA

[6] Sydney Inst Astron SIfA, Sch Phys, Sydney, NSW 2006, Australia

来源：

TIDAL DISRUPTION EVENTS AND AGN OUTBURSTS | 2012年 / 39卷

关键词：

SUPERMASSIVE BLACK-HOLES; RAY; NEARBY; OUTBURST; STATES; GIANT; FLARE; STAR;

D O I：

10.1051/epjconf/20123902003

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Stars approaching a supermassive black hole (SMBH) can be tidally disrupted and subsequently accreted, providing a unique way to find and study inactive SMBHs. We report on our discovery of a new tidal disruption event candidate, 2XMMi J184725.1-631724, with unprecedented ultrasoft X-ray spectra near the flare peak. It lies toward the center of an inactive galaxy at z = 0.0353. It was detected serendipitously in two XMM-Newton observations separated by 211 days, with the flux increasing by a factor of similar to 9. The source was not detected in X-rays by ROSAT in 1992, indicating a long-term variability factor of > 64; neither by Swift in 2011, implying a flux decay factor of > 12 since the last XMM-Newton observation. The XMM-Newton X-ray spectra are dominated by a strong cool thermal disk (> 80%, tens of eV) with the luminosity appearing to follow the L proportional to T-4 relation, often seen in the thermal state of the BH X-ray binaries. Both XMM-Newton observations show large variability on timescales of hours. This can be explained as due to fast variations in the mass accretion rate, maybe caused by the shocks during the tidal disruption of the star.

引用

页数：5

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