论文标题
建模来自黑洞X射线二进制Maxi J1348 $ - $ 630的减速喷气机的运动学
Modeling the kinematics of the decelerating jets from the black hole X-ray binary MAXI J1348$-$630
论文作者
论文摘要
黑洞低质量X射线二进制文件（BH LMXB）可以以离散喷射的形式发射强大的外流。观察这些射出的整个轨迹使我们能够精确地对其运动进行建模，这对于测量其物理特性至关重要。特别是，观察最终减速阶段通常采样不佳，这是获得对喷气式能量的可靠估计的基本。在其2019/2020爆发期间，BH LMXB Maxi J1348 $ - $ 630推出了一条单面发射喷气式飞机，由于与星际介质（ISM）的相互作用，在强大减速后在大尺度上检测到了单面发射喷气式飞机。我们通过动态外部冲击模型成功地建模了喷气运动，这使我们能够约束Jet初始Lorentz因子$γ_0= 1.85^{+0.15} _ { - 0.12} $，倾斜角$θ= 29.3 _ _ { - 3.2} 21.5 _ { - 3.0}^{+1.8} $（mjd $ - $ 58500 $）。在对喷射开口角和外部ISM密度的简单假设下，我们发现该喷气机具有较大的初始动能$ e_0 = 4.6^{+20.0} _ { - 3.4} \ times 10^{46} $ ERG，远远大于从JET的SynChrotron Synchrotron Synchrotrons sissions sissions sysission synchrotron sysission symiss sysission for lmxbs compom for。这意味着离散的喷射只散发出其总能量的一小部分，而是转移到环境中。喷射功率估计值大于同时可用的吸积功率，我们提供了几种减轻这种差异的选择。我们推断，Maxi J1348 $ - 630可能嵌入了ISM腔中，内部密度$ n = 0.0010^{+0.0005} _ { - 0.0003} $ CM $ $ $^{ - 3} $和RADIUS $ r _ {\ rm C} = 0.61 = 0.61^= 0.61^{+0.11} $ 0.11}对于其他BH LMXB的建议，系统的先前活动。
Black hole low mass X-ray binaries (BH LMXBs) can launch powerful outflows in the form of discrete ejecta. Observing the entire trajectory of these ejecta allows us to model their motion with great accuracy, and this is essential for measuring their physical properties. In particular, observing the final deceleration phase, often poorly sampled, is fundamental to obtain a reliable estimate of the jet's energy. During its 2019/2020 outburst, the BH LMXB MAXI J1348$-$630 launched a single-sided radio-emitting jet that was detected at large scales after a strong deceleration due to the interaction with the interstellar medium (ISM). We successfully modelled the jet motion with a dynamical external shock model, which allowed us to constrain the jet initial Lorentz factor $Γ_0 = 1.85^{+0.15}_{-0.12}$, inclination angle $θ= 29.3_{-3.2}^{+2.7}$ deg and ejection date $t_{\rm ej} = 21.5_{-3.0}^{+1.8}$ (MJD $-$ $58500$). Under simple assumptions on the jet opening angle and on the external ISM density, we find that the jet has a large initial kinetic energy $E_0 = 4.6^{+20.0}_{-3.4} \times 10^{46}$ erg, far greater than what commonly measured for LMXBs from the jet's synchrotron emission. This implies that discrete ejecta radiate away only a small fraction of their total energy, which is instead transferred to the environment. The jet power estimate is larger than the simultaneous available accretion power, and we present several options to mitigate this discrepancy. We infer that MAXI J1348$-$630 is likely embedded in an ISM cavity with internal density $n = 0.0010^{+0.0005}_{-0.0003}$ cm$^{-3}$ and radius $R_{\rm c} = 0.61^{+0.11}_{-0.09}$ pc, which could have been produced by the system's previous activity, as proposed for other BH LMXBs.
