Remnants of massive metal-poor stars: Viable engines for ultra-luminous X-ray sources

被引：21
|
作者：
Mapelli, M. [1 ]
Ripamonti, E. [1 ]
Zampieri, L. [2 ]
Colpi, M. [1 ]
机构：
[1] Univ Milano Bicocca, Phys Dept G Occhialini, I-20126 Milan, Italy
[2] INAF Osservatorio Astron Padova, I-35122 Padua, Italy
来源：
ASTRONOMISCHE NACHRICHTEN | 2011年 / 332卷 / 04期
关键词：
black hole physics; galaxies: starburst; X-rays: binaries; X-rays: galaxies; FORMATION RATE INDICATOR; BLACK-HOLE FORMATION; FORMING GALAXIES; LOW METALLICITY; STELLAR YIELDS; DWARF GALAXIES; SBS; 0335-052; ENVIRONMENT; POPULATION; EMISSION;
D O I：
10.1002/asna.201011511
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Massive metal-poor stars might end their life by directly collapsing into massive (approximate to 25-80M(circle dot)) black holes (BHs). We derive the number of massive BHs (N-BH) that are expected to form per galaxy via this mechanism. We select a sample of 66 galaxies with X-ray coverage, measurements of the star formation rate (SFR) and of the metallicity. We find that N-BH correlates with the number of observed ultra-luminous X-ray sources (ULXs) per galaxy (N-ULX) in this sample. We discuss the dependence of N-ULX and of N-BH on the SFR and on the metallicity. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
引用
收藏
页码：414 / 417
页数：4
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