A disrupted bulgeless satellite galaxy as counterpart of the ultraluminous X-ray source ESO 243-49 HLX-1
A disrupted bulgeless satellite galaxy as counterpart of the ultraluminous X-ray source ESO 243-49 HLX-1
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DOI：
10.1051/0004-6361/201322435
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发表时间：
2013-09
影响因子：
6.5
通讯作者：
M. Mapelli;F. Annibali;L. Zampieri;R. Soria
中科院分区：
文献类型：
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作者：
M. Mapelli;F. Annibali;L. Zampieri;R. Soria
点状X射线源HLX-1靠近S 0星系ESO 243-49，是最强的中等质量黑洞候选者之一，但其对应物的性质仍然令人困惑。通过N体/光滑粒子流体动力学模拟，我们调查的假设，HLX-1对应的是一个无凸起的卫星星系，它经历了一个较小的合并与S 0星系的核。我们推导出合成表面亮度轮廓HLX-1在六个哈勃空间望远镜（HST）的过滤器，从远紫外（FUV）到红外波长的模拟对应物，我们将它们与观测到的配置文件进行比较。我们的模型相匹配的排放与HLX-1对应的所有考虑的过滤器，包括蓝色的，即使不需要的贡献照射光盘。模拟还可以解释扩展的FUV发射，其中有一些来自F140 LP HST滤波器的分析的提示。这种匹配是不可能通过假设一个凸出的卫星，或一个年轻的星星集群，或一个辐射盘组件来实现的。
The point-like X-ray source HLX-1, close to the S0 galaxy ESO 243-49, is one the strongest intermediate-mass black hole candidates, but the nature of its counterpart is still puzzling. By means of N-body/smoothed particle hydrodynamics simulations, we investigate the hypothesis that the HLX-1 counterpart is the nucleus of a bulgeless satellite galaxy, which undergoes a minor merger with the S0 galaxy. We derive synthetic surface brightness profiles for the simulated counterpart of HLX-1 in six Hubble Space Telescope (HST) filters, ranging from far ultraviolet (FUV) to infrared wavelengths, and we compare them with the observed profiles. Our model matches the emission associated with the HLX-1 counterpart in all considered filters, including the bluer ones, even without requiring the contribution of an irradiated disc. The simulation can also account for an extended FUV emission, of which there are some hints from the analysis of the F140LP HST filter. This matching is impossible to achieve by assuming either a bulgy satellite, or a young star cluster, or an irradiated disc component.