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arXiv 2003.02360astro-ph.HE
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黑洞瞬态MAXI J1820 +070的质量比

The binary mass ratio in the black hole transient MAXI J1820+070

M. A. P. Torres, J. Casares, F. Jiménez-Ibarra, A. Álvarez-Hernández, T. Muñoz-Darias, M. Armas Padilla, P. G. Jonker, M. Heida

摘要:

我们提出了中等分辨率光谱的光学对应的黑洞X射线瞬态MAXI J1820+070(=ASASSN-18 ey)获得的OSIRIS光谱仪上的10.4米大加那利望远镜。这些观测是在源接近静止状态和2019年8月重新开始活动之前进行的。我们利用这些数据和K型矮模板采取相同的仪器配置来测量投影的施主星的旋转速度。我们发现$v_{rot} \sin i = 84 \pm 5$公里的$^{-1}$($1\!-\!σ$),这意味着一个捐助者黑洞质量比$q = {M_2}/{M_1} = 0.072 \pm 0.012$的情况下,潮汐锁定和罗氏瓣填充捐助者的明星。导出的恒星组分的动力学质量为$M_1 = (5.95 \pm 0.22)\sin ^{-3}i$ $M_\odot$和$M_2 = (0.43 \pm 0.08) \sin^{-3}i$ $M_\odot$。$q$的使用,结合吸积盘的大小在当时的光学光谱的估计,使我们能够修改我们以前的轨道倾角限制$66^{\circ} < i < 81^{\circ}$。这些值导致$5.73 <M_1(M_\odot) < 8.34$和$0.28 < M_2(M_\odot) < 0.77$质量的95%置信水平限值。采用射电喷流的$63 \pm 3^{\circ}$方位角作为双星倾角,得到$M_1 = 8.48^{+0.79}_{-0.72} M_\odot$和$M_2 = 0.61^{+0.13}_{-0.12} M_\odot$($1\!-\!σ$)。

英文摘要:

We present intermediate resolution spectroscopy of the optical counterpart to the black hole X-ray transient MAXI J1820+070 (=ASASSN-18ey) obtained with the OSIRIS spectrograph on the 10.4-m Gran Telescopio Canarias. The observations were performed with the source close to the quiescent state and before the onset of renewed activity in August 2019. We make use of these data and K-type dwarf templates taken with the same instrumental configuration to measure the projected rotational velocity of the donor star. We find $v_{rot} \sin i = 84 \pm 5$ km s$^{-1}$ ($1\!-\!σ$), which implies a donor to black-hole mass ratio $q = {M_2}/{M_1} = 0.072 \pm 0.012$ for the case of a tidally locked and Roche-lobe filling donor star. The derived dynamical masses for the stellar components are $M_1 = (5.95 \pm 0.22)\sin ^{-3}i$ $M_\odot$ and $M_2 = (0.43 \pm 0.08) \sin^{-3}i$ $M_\odot$. The use of $q$, combined with estimates of the accretion disk size at the time of the optical spectroscopy, allows us to revise our previous orbital inclination constraints to $66^{\circ} < i < 81^{\circ}$. These values lead to 95% confidence level limits on the masses of $5.73 <M_1(M_\odot) < 8.34$ and $0.28 < M_2(M_\odot) < 0.77$. Adopting instead the $63 \pm 3^{\circ}$ orientation angle of the radio jet as the binary inclination leads to $M_1 = 8.48^{+0.79}_{-0.72} M_\odot$ and $M_2 = 0.61^{+0.13}_{-0.12} M_\odot$ ($1\!-\!σ$).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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