XMM-Newton observations of the ultraluminous nuclear X-ray source in M33

被引：36

作者：

Foschini, L

Rodriguez, J

Fuchs, Y

Ho, LC

Dadina, M

Di Cocco, G

Courvoisier, TJL

Malaguti, G

机构：

[1] CNR, Ist Astrofis Spaziale & Fis Cosm, Sez Bologna, I-40129 Bologna, Italy

[2] CEA Saclay, DSM, DAPNIA, SAp,CNRS,FRE 2591, F-91191 Gif Sur Yvette, France

[3] INTEGRAL Sci Data Ctr, CH-1290 Versoix, Switzerland

[4] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA

[5] Observ Geneva, CH-1290 Sauverny, Switzerland

来源：

ASTRONOMY & ASTROPHYSICS | 2004年 / 416卷 / 02期

关键词：

X-rays : binaries; X-rays : galaxies; galaxies : individual : M33; galaxies : nuclei;

D O I：

10.1051/0004-6361:20034303

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present observations with XMM-Newton of M 33 X-8, the ultraluminous X-ray source (L0.5-10 (kev) approximate to 2 x 10(39) erg/s) closest to the centre of the galaxy. The best-fit model is similar to the typical model of Galactic black holes in very high state. Comparison with previous observations indicates that the source is still in a very high state after about 20 years of observations. No state transition has been observed even during the present set of XMM-Newton observations. We estimate the lower limit of the mass of the black hole >6 M-., but with proper parameters taking into account different effects, the best estimate becomes 12 M-.. Our analysis favours the hypothesis that M 33 X-8 is a stellar mass black hole candidate, in agreement with the findings of other authors. In addition, we propose a different model where the high luminosity of the source is likely to be due to orientation effects of the accretion disc and anisotropies in the Comptonized emission.

引用

页码：529 / 536

页数：8

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