黑洞X射线双星GRS 1915+105中准周期振荡滞后与射电喷流之间存在关联的有力证据
Compelling evidence of a link between the lags of the quasi-periodic oscillations and the radio jet in the black-hole X-ray binary GRS 1915+105
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中文总结 AI 辅助
该研究通过NICER和AMI-LA观测发现，GRS 1915+105中C型QPO的硬滞后与强射电活动相关，表明相对论性喷流导致硬相位滞后，支持QPO滞后追踪冕几何与吸积-喷流耦合。
中文摘要 AI 辅助
GRS 1915+105是研究最深入的黑洞X射线双星之一，以其极端的变率和丰富的现象学而闻名。此前利用Rossi X射线计时探测器对该源的研究报道了C型准周期振荡（QPO）相位滞后的转变：当QPO频率高于约2赫兹时，相位滞后为软滞后（低能光子滞后于高能光子）；当QPO频率降至约2赫兹以下时，相位滞后变为硬滞后。QPO的硬滞后与强射电发射时期相重合。我们分析了NICER在2018年至2020年间对GRS 1915+105的观测数据，该期间源的通量持续下降，并对探测到的C型QPO进行了详细的谱-时变研究。我们发现频率范围约为1.3-3.9赫兹的C型QPO，其表现出软滞后，且与RXTE观测相反，在频率低于2赫兹时没有显示出硬相位滞后的证据。准同时的AMI-LA射电观测显示，在此期间射电流量持续偏低（≲5毫央斯基）。这些结果似乎表明，GRS 1915+105中的硬QPO滞后与强射电活动的存在有关，暗示相对论性喷流是硬相位滞后的成因，支持了QPO相位滞后追踪冕几何结构变化以及吸积-喷流耦合过程的场景。
英文摘要
GRS 1915+105 is one of the most studied black-hole X-ray binaries, known for its extreme variability and rich phenomenology. Previous studies of this source with the Rossi X-ray Timing Explorer reported a transition of the phase-lags of type-C quasi-periodic oscillations (QPOs) from soft, where low-energy photons lag the high-energy ones, when the QPO frequency is higher than ${\sim} 2 ~{\rm Hz}$, to hard when the QPO frequency decreases below ${\sim} 2 ~{\rm Hz}$. The hard-lags of the QPO coincide with episodes of strong radio emission. We analyse NICER observations of GRS 1915+105 obtained between 2018 and 2020, during a period in which the source flux decreased steadily, and perform a detailed spectral-timing study of the detected type-C QPOs. We find a type-C QPO with frequencies in the range of ${\sim} 1.3$-$3.9 ~{\rm Hz}$, which displays soft lags and, contrary to the RXTE observations, shows no evidence of hard phase lags at frequencies below $2~{\rm Hz}$. Quasi-simultaneous AMI-LA radio observations show consistently low radio flux (${\lesssim} 5 ~{\rm mJy}$) during this period. These results appear to show that the hard QPO lags in GRS 1915+105 are linked to the presence of strong radio activity, suggesting that the relativistic jet is responsible for the hard phase lags, supporting a scenario in which QPO phase lags trace changes in coronal geometry and accretion-ejection coupling in GRS 1915+105.
发表机构
- Instituto Argentino de Radioastronomía (CCT La Plata, CONICET（阿根廷射电天文研究所）
- CICPBA（拉普拉塔国立大学天文与地球物理学院）
- UNLP)（格罗宁根大学卡普坦天文研究所）
- Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata（意大利国家天体物理研究所布雷拉天文台）
- Kapteyn Astronomical Institute, University of Groningen（中国科学院高能物理研究所粒子天体物理重点实验室）
- Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Brera（牛津大学物理系天体物理学）
- Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences
- Astrophysics, Department of Physics, University of Oxford
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