We have studied the kinematic properties of the candidates for hot subdwarfs (HSDs) selected by Geier et al. from theGaiaDR2 catalogue. We have used a total of 12 515 stars with relative trigonometric parallax errors less than 30%. The HSDs are shown to have different kinematics, depending on their positions on the celestial sphere. For example, the sample of low-latitude (|b| < 20°) HSDs rotates around the Galactic center with a linear velocity V0 = 221 ± 5 km s⁻¹. This suggests that they belong to the Galactic thin disk. At the same time, they lag behind the local standard of rest by ΔV_☉ ~ 16 km s⁻¹ due to the asymmetric drift. The high-latitude (|b| ≥ 20°) HSDs rotate with a considerably lower velocity, V_☉ = 168 ^± 6 km s⁻¹. Their lagging behind the local standard of rest is already ΔV_☉ ∼ 40 km s⁻¹. Based on the entire sample of 12 515 HSDs, we have found a positive rotation around the x axis significantly differing from zero with an angular velocity ω₁ = 1.36±0.24 km s⁻¹ kpc⁻¹. We have studied the samples of HSDs that are complete within r < 1.5 kpc. Based on them, we have traced the evolution of the parameters of the residual velocity ellipsoid as a function of both latitude |b| and coordinate |z|. The following vertical disk scale heights have been found: h = 180 ± 6 and 290 ± 10 pc from the low- and high-latitude HSDs, respectively. A new estimate of the local stellar density Σ_out = 53 ± 4 M☉ kpc⁻² has been obtained for z_out = 0.56 kpc from the high-latitude HSDs.

中文翻译：

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盖亚DR2目录中热亚矮的运动学

我们已经研究了由Geier等人选择的候选热亚矮（HSD）的运动学特性。来自GaiaDR2目录。我们总共使用了12 515颗相对误差小于30％的恒星。根据其在天球上的位置，HSD具有不同的运动学特性。例如，低纬度（| b | <20°）HSD的样本绕银河系中心以线速度V 0 = 221±5 km s ^-1旋转。这表明它们属于银河薄磁盘。与此同时，它们滞后由Δ本地标准其余后面V _☉〜16个公里S ^-1由于不对称漂移。高纬度（| b| ≥20°）的HSD具有相当低的速度，旋转V _☉ = 168 ^± 6公里S ^-1。他们休息的地方标准相对滞后已经Δ V _☉〜40公里S ^-1。基于对12周515的HSD整个样品，我们已经发现在围绕正旋转X轴显著不同于零与角速度ω ₁ = 1.36±0.24公里S ^-1 KPC ^-1。我们研究了在r <1.5 kpc内完成的HSD样本。基于它们，我们跟踪了残余速度椭球参数随纬度|纬度| | | | | b| 和协调 z |。已发现以下垂直磁盘刻度高度：分别从低纬度HSD和高纬度HSD得出h = 180±6和290±10 pc。本地恒星密度Σ的新估计_出= 53±4中号☉KPC ^-2已经获得Ž_出从高纬度的HSD = 0.56 KPC。