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arXiv 1411.1306astro-ph.HEastro-ph.CO
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中等质量黑洞候选者ESO 243-49 HLX-1的射电性质

On the radio properties of the intermediate-mass black hole candidate ESO 243-49 HLX-1

D. Cseh, N. A. Webb, O. Godet, D. Barret, S. Corbel, M. Coriat, H. Falcke, S. A. Farrell, E. Koerding, E. Lenc, J. M. Wrobel

摘要:

我们使用澳大利亚望远镜紧凑阵列(ATCA)和卡尔G。Jansky甚大阵列(VLA)我们报告了使用ATCA在硬X射线状态期间在HLX-1位置检测到无线电发射的情况。假设“基本面”的吸积黑洞是适用的,我们提供了一个独立的估计黑洞质量的$M_{\rm{BH}}\leq2.8^{+7.5}_{-2.1} \times 10^{6}$ M $_{\odot}$在90%的置信度。然而,我们认为,检测到的无线电发射很可能是多普勒增强,我们的质量估计是一个上限。我们讨论了其他可能的无线电发射的起源,如由于射电星云,恒星形成,或后来的耀斑与大尺度环境的相互作用。这些都被认为是不够的。VLA观测是在X射线爆发期间进行的。然而,没有发现新的射电耀斑,可能是由于稀疏的时间采样。最深的组合VLA数据表明存在可变射电源,我们简要讨论了之前检测到的耀斑的特性,并将其与微类星体和活动星系核进行比较。

英文摘要:

We present follow-up radio observations of ESO 243-49 HLX-1 from 2012 using the Australia Telescope Compact Array (ATCA) and the Karl G. Jansky Very Large Array (VLA). We report the detection of radio emission at the location of HLX-1 during its hard X-ray state using the ATCA. Assuming that the `Fundamental Plane' of accreting black holes is applicable, we provide an independent estimate of the black hole mass of $M_{\rm{BH}}\leq2.8^{+7.5}_{-2.1} \times 10^{6}$ M$_{\odot}$ at 90% confidence. However, we argue that the detected radio emission is likely to be Doppler-boosted and our mass estimate is an upper limit. We discuss other possible origins of the radio emission such as being due to a radio nebula, star formation, or later interaction of the flares with the large-scale environment. None of these were found adequate. The VLA observations were carried out during the X-ray outburst. However, no new radio flare was detected, possibly due to a sparse time sampling. The deepest, combined VLA data suggests a variable radio source and we briefly discuss the properties of the previously detected flares and compare them with microquasars and active galactic nuclei.

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