A YOUNG MASSIVE STELLAR POPULATION AROUND THE INTERMEDIATE-MASS BLACK HOLE ESO 243-49 HLX-1
A YOUNG MASSIVE STELLAR POPULATION AROUND THE INTERMEDIATE-MASS BLACK HOLE ESO 243-49 HLX-1
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DOI：
10.1088/2041-8205/747/1/l13
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发表时间：
2011-10
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通讯作者：
S. Farrell;M. Servillat;J. Pforr;T. Maccarone;C. Knigge;O. Godet;C. Maraston;N. Webb;D. Barret;A. Gosling;R. Belmont;K. W. U. O. Sydney;Australia;U. Leicester;Uk;H. C. F. Astrophysics;Usa;U. Portsmouth;U. Southampton;Irap;France;U. Oxford
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作者：
S. Farrell;M. Servillat;J. Pforr;T. Maccarone;C. Knigge;O. Godet;C. Maraston;N. Webb;D. Barret;A. Gosling;R. Belmont;K. W. U. O. Sydney;Australia;U. Leicester;Uk;H. C. F. Astrophysics;Usa;U. Portsmouth;U. Southampton;Irap;France;U. Oxford
我们介绍了哈勃太空望远镜和同步斯威夫特X射线望远镜观测的最强候选中等质量黑洞（IMBH）ESO 243-49 HLX-1。拟合从X射线到近红外波长的光谱能量分布表明，宽带光谱与简单的辐射盘模型不一致，但可以用一个辐射吸积盘加上一个106 M的恒星群组成的模型来描述。人口的年龄不能被唯一地限制，年轻和年老的恒星人口都允许。然而，旧的解决方案需要过多的磁盘再处理和一个非常小的磁盘，所以我们倾向于年轻的解决方案（1.13亿年）。此外，尘埃带的存在和对宿主星系的X射线观测缺乏任何核活动表明，一个富含气体的小型合并可能发生在不到2.2亿年前。这样的合并事件可以解释IMBH和年轻恒星群的存在。
We present Hubble Space Telescope and simultaneous Swift X-ray Telescope observations of the strongest candidate intermediate-mass black hole (IMBH) ESO 243-49 HLX-1. Fitting the spectral energy distribution from X-ray to near-infrared wavelengths showed that the broadband spectrum is not consistent with simple and irradiated disk models, but is well described by a model comprised of an irradiated accretion disk plus a ∼106 M☉ stellar population. The age of the population cannot be uniquely constrained, with both young and old stellar populations allowed. However, the old solution requires excessive disk reprocessing and an extremely small disk, so we favor the young solution (∼13 Myr). In addition, the presence of dust lanes and the lack of any nuclear activity from X-ray observations of the host galaxy suggest that a gas-rich minor merger may have taken place less than ∼200 Myr ago. Such a merger event would explain the presence of the IMBH and the young stellar population.