The Galactic Centre source G2 was unlikely born in any of the known massive binaries

The Galactic Centre source G2 was unlikely born in any of the known massive binaries
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银河中心源 G2 不太可能诞生于任何已知的大质量双星中

DOI:
10.1093/mnras/sty1330
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发表时间:
2018
影响因子:
4.8
通讯作者:
Habibi
Habibi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Calderón;Cuadra;Schartmann;Burkert;Eisenhauer;Habibi

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源G2已经完成了围绕Sgr A* 的近心点通道,Sgr A * 是我们银河系中心的超大质量黑洞。虽然它已经被监测了15年,但它的天体物理性质和起源仍然未知。在这项工作中,我们的目标是测试的假设G2是恒星风碰撞的结果。要做到这一点,我们研究的议案和最终的命运形成的气体团块的恒星风碰撞的结果,在大规模的双星。我们的方法是基于一个测试粒子模型,以描述这种团块的轨迹。该模型考虑了Sgr A* 的引力场、团块与星际介质的相互作用以及它们有限的寿命。我们的分析允许我们基于四个论点拒绝假设:(i)如果G2自形成以来遵循纯粹的开普勒轨道,它不可能在任何已知的大质量双星中产生,因为它们的运动并不一致,(ii)一般来说,气体团在足够接近Sgr A* 之前通过热传导在非常短的时间尺度上蒸发(),(iii)IRS 16SW,G2起源的最佳候选者,不能产生像G2那样大的团,(iv)从IRS 16SW喷射出的团描述的轨迹与观测到的G2运动明显不同。
The source G2 has already completed its pericentre passage around Sgr A*, the supermassive black hole in the centre of our Galaxy. Although it has been monitored for 15 yr, its astrophysical nature and origin still remain unknown. In this work, we aim to test the hypothesis of G2 being the result of a stellar wind collision. To do so, we study the motion and final fate of gas clumps formed as a result of collisions of stellar winds in massive binaries. Our approach is based on a test-particle model in order to describe the trajectories of such clumps. The model takes into account the gravitational field of Sgr A*, the interaction of the clumps with the interstellar medium as well as their finite lifetimes. Our analysis allows us to reject the hypothesis based on four arguments:(i) if G2 has followed a purely Keplerian orbit since its formation, it cannot have been produced in any of the known massive binaries since their motions are not consistent,(ii) in general, gas clumps are evaporated through thermal conduction on very short timescale () before getting close enough to Sgr A*, (iii) IRS 16SW, the best candidate for the origin of G2, cannot generate clumps as massive as G2, and (iv) clumps ejected from IRS 16SW describe trajectories significantly different to the observed motion of G2.
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