Proper Motions and Velocity Asymmetries in the RW Aur Jet
Proper Motions and Velocity Asymmetries in the RW Aur Jet
复制标题
RW Aur Jet 中的固有运动和速度不对称
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
C. Dougados
中科院分区：
文献类型：
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作者：
L. López;S. Cabrit;C. Dougados
我们提出了 RW Aur 射流在光学禁线中的自适应光学光谱成像观测，角分辨率为 0.4 英寸。与两年后获取的 HST 数据进行比较表明，蓝移和红移波瓣中的自行运动与其径向速度具有相同的比率，这直接证明了该射流中的速度不对称性是真实存在的，而不是发射率效应。推断的喷射流与视线的倾角为 i = 46±3°。内部结间距似乎可以通过至少两种模式的时间变化来解释：一种是在 ≤3-10 年的时间尺度上不规则和不对称（可能是随机的），另一种是在 ≃20 年的时间尺度上更规则。我们还报告了红移波瓣中相关速度和激发梯度的间接证据，可能与该系统中的蓝/红速度和亮度不对称有关。
We present adaptive optics spectro-imaging observations of the RW Aur jet in optical forbidden lines, at an angular resolution of 0.4″. Comparison with HST data taken 2 yr later shows that proper motions in the blueshifted and redshifted lobes are in the same ratio as their radial velocities, a direct proof that the velocity asymmetry in this jet is real and not an emissivity effect. The inferred jet inclination to the line of sight is i = 46±3°. The inner knot spacing appears best explained by time variability with at least two modes: one irregular and asymmetric (possibly random) on timescales of ≤3–10 yr, and another more regular with ≃20 yr period. We also report indirect evidence for correlated velocity and excitation gradients in the redshifted lobe, possibly related to the blue/red velocity and brightness asymmetry in this system.