论文标题
黑洞瞬态最大J0637-430的2小时二进制周期
A 2-hr binary period for the black hole transient MAXI J0637-430
论文作者
论文摘要
我们重新审视了银河黑洞（BH）候选人最大J0637-430的X射线和光学研究的一系列已发表的结果，该结果于2019年爆发。结合了先前报道的峰值爆发亮度的值，峰值爆发的亮度值，最合适的放射线，最佳的内部和外部积分磁盘，观察角度，观察角度，峰值次数为二次启动。改善对系统参数的约束。我们估计A HeliePentric距离d =（8.7 +/- 2.3）kpc，一个投影的半乳侧距离r =（13.2 +/- 1.8）kpc和一个高度| z | =（3.1 +/- 0.8）KPC来自银河平面。它是距离银河中心最远的BH候选人目前已知的银河系候选人。我们推断出BH质量m_1 =（5.1 +/- 1.6）m_ {sun}，一个自旋参数A* <〜0.25，供体星质量m_2 =（0.25 +/- 0.07）m_ {sun}，eDdington +/-0 +/- 0.11 +/- 0.11和Biary Edightio lambda peak eDdington +/-0 +/- 0.11 +/- 0.11 +/- 0.11 +/- 0.11和Biary Perience P_} 2.2^{+0.8} _ { - 0.6} hr。这是到目前为止对任何银河BH X射线二进制的最短时间。如果供体恒星是主要序列矮人，则这样的时期对应于轨道缩小的进化阶段，该阶段是由重力辐射驱动的，并且该恒星恢复了与Roche Lobe的接触（时期间隙的低端）。最短时间（<〜3 hr）的三个银河BHS也是距银河平面最高距离（> 〜2 kpc）的三个银河BH。这可能是因为具有较高结合能的二进制能力可以在快速的出生踢中生存。
We revisit various sets of published results from X-ray and optical studies of the Galactic black hole (BH) candidate MAXI J0637-430, which went into outburst in 2019. Combining the previously reported values of peak outburst luminosity, best-fitting radii of inner and outer accretion disk, viewing angle, exponential decay timescale and peak-to-peak separation of the He II 4686 disk emission line, we improve the constraints on the system parameters. We estimate a heliocentric distance d = (8.7 +/- 2.3) kpc, a projected Galactocentric distance R = (13.2 +/- 1.8) kpc and a height |z| = (3.1 +/- 0.8) kpc from the Galactic plane. It is the currently known Milky Way BH candidate located farthest from the Galactic Centre. We infer a BH mass M_1 = (5.1 +/- 1.6) M_{sun}, a spin parameter a* <~ 0.25, a donor star mass M_2 = (0.25 +/- 0.07) M_{sun}, a peak Eddington ratio lambda = 0.17 +/- 0.11 and a binary period P_{orb} = 2.2^{+0.8}_{-0.6} hr. This is the shortest period measured or estimated so far for any Galactic BH X-ray binary. If the donor star is a main-sequence dwarf, such a period corresponds to the evolutionary stage where orbital shrinking is driven by gravitational radiation and the star has regained contact with its Roche lobe (low end of the period gap). The three Galactic BHs with the shortest period (<~3 hr) are also those with the highest vertical distance from the Galactic plane (>~2 kpc). This is probably because binaries with higher binding energies can survive faster natal kicks.
