论文标题
重新确定了经典头虫的银河螺旋模式的参数
Redetermination of the Parameters of the Galactic Spiral Pattern from Classical Cepheids
论文作者
论文摘要
我们已经研究了一个银河经典头孢菌素的样本，并从Skowron等人那里获得了距离估计。 （2019年），在该期间基于周期性关系的关系确定。在本文中，Skowron等人。 （2019年）根据我们先前对我们获得的这些头孢菌素的运动学分析的结果，距离增加了10 \％。我们已经完善了两个螺旋臂的几何特性：Carina-Sagittarius和外部。假定太阳的银色中心距离为$ 8.1 \ pm0.1 $ 〜kpc。基于257个属于Carina-sagittarius臂段的头部段，年龄在80--120 Myr范围内，我们发现了螺旋模式$ i = -12.7 \ pm0.4^\ circ $的螺距角度，并且此手臂$ a_0 = 7.28 = 7.28 \ pM0.055 $ 〜kpc。基于352个来自外臂的头臂，年龄在120--300 MYR范围内，我们发现$ i = -12.0 \ pm0.5^\ circ $和$ a_0 = 13.03 \ pm0.06 $ 〜kpc。基于在80--300 MYR范围内的1618个头孢菌素的样本，我们在``位置角度 - 距离的位置''平面构建了一个小波图。从我们对此地图的分析中获得了以下估计值：$ i = -12.9 \ pm0.4^\ circ $和$ a_0 = 7.43 \ pm0.05 $ 〜kpc用于Carina-sagittarius臂和$ i = -12.5 \ pm0 .5^\ pm0 .5^\ Circ $和$ a_0 = 13.33.33.3333333333.33 $ 0.0.0.0.0.33 $ kpc kpc kpc.我们发现，太阳非常接近位于太阳和珀尔修斯臂之间的旋转半径，并估计螺旋模式的角度旋转速度$ω_p= 27 \ pm1 $ km s $ s $^{ - 1} $ kpc $^{ - 1} $。
We have studied a sample of Galactic classical Cepheids with their distance estimates taken from Skowron et al. (2019), where they were determined based on the period-luminosity relation. In this paper the Skowron et al. (2019) distances were increased by 10\%, according to the results of our kinematic analysis of these Cepheids obtained by us previously. We have refined the geometric characteristics of two spiral arms: the Carina-Sagittarius and Outer ones. The Galactocentric distance of the Sun was assumed to be $8.1\pm0.1$~kpc. Based on 257 Cepheids belonging to a Carina-Sagittarius arm segment with ages in the range 80--120 Myr, we have found the pitch angle of the spiral pattern $i=-12.7\pm0.4^\circ$ and the position of this arm $a_0=7.28\pm0.05$~kpc. Based on 352 Cepheids from the Outer arm with ages in the range 120--300 Myr, we have found $i=-12.0\pm0.5^\circ$ and $a_0=13.03\pm0.06$~kpc. Based on a sample of 1618 Cepheids with ages in the range 80--300 Myr, we have constructed a wavelet map in the ``position angle--logarithm of distance'' plane. The following estimates have been obtained from our analysis of this map: $i=-12.9\pm0.4^\circ$ and $a_0=7.43\pm0.05$~kpc for the Carina-Sagittarius arm and $i=-12.5\pm0 .5^\circ$ and $a_0=13.33\pm0.06$~kpc for the Outer arm. We have found that the Sun is very close to the corotation radius that is located between the Sun and the Perseus arm and estimates the angular rotation speed of the spiral pattern $Ω_p = 27\pm1$ km s$^{-1}$ kpc$^{-1}$.
