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XTE J1550-564相对论喷流的演化和微类星体的环境

Evolution of relativistic jets from XTE J1550-564 and the environment of microquasars

Shuang Nan Zhang, JingFang Hao

摘要:

钱德拉X射线天文台在黑洞X射线瞬变XTE J1550-564中探测到两个相对论性X射线喷流。我们报告的伽马射线暴外部冲击模型的演化的两个喷流的全面分析。一个合理的假设是,在中心源外有一个空腔,喷流首先以恒定的速度运动,然后由于喷流与星际介质(ISM)之间的相互作用而减速。空洞的最佳拟合半径在东侧约为0.36 pc,在西侧约为0.46 pc,密度也显示出不对称性,在东侧约为0.015 cm $^{-3}$,在西侧约为0.21 cm $^{-3}$。在另一个微类星体H1743 -322中也发现了大尺度的低密度区。这些结果与先前的建议相一致,即与正常的银河系环境相比,微类星体的环境应该是相当空洞的。微类星体喷流的一般情况下,提出了将观测到的喷流分为三个主要类别,不同的喷流形态(和大小)对应于不同规模的真空环境周围。

英文摘要:

Two relativistic X-ray jets have been detected with the Chandra X-ray observatory in the black hole X-ray transient XTE J1550-564. We report a full analysis of the evolution of the two jets with a gamma-ray burst external shock model. A plausible scenario suggests a cavity outside the central source and the jets first travelled with constant velocity and then are slowed down by the interactions between the jets and the interstellar medium (ISM). The best fitted radius of the cavity is ~0.36 pc on the eastern side and ~0.46 pc on the western side, and the densities also show asymmetry, of ~0.015 cm$^{-3}$ on the east to ~0.21 cm$^{-3}$ on the west. Large scale low density region is also found in another microquasar system, H 1743-322. These results are consistent with previous suggestions that the environment of microquasars should be rather vacuous, compared to the normal Galactic environment. A generic scenario for microquasar jets is proposed, classifying the observed jets into three main categories, with different jet morphologies (and sizes) corresponding to different scales of vacuous environments surrounding them.

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