论文标题
Gaia Dr2巨人在银河尘 - ii。红色地图和模型的应用
Gaia DR2 giants in the Galactic dust -- II. Application of the reddening maps and models
论文作者
论文摘要
我们利用101 \，810 {\ it gaia} dr2巨人的完整样本，在纸质圆柱体中选中，在太阳周围，半径为700 pc，$ | z | = 1800 $ pc，使用{\ it iTaga gaia} dr2 parallaxes，$ g_ \ g_ \ nathrm {和{\ it Wise} $ W3 $光度法。我们解释了可观察到的模式的空间变化$ g_ \ mathrm {bp} -g_ \ mathrm {rp} $和$ g_ \ mathrm {rp} -w3 $，通过在GM20 3D尘埃分发模型中所描述的相应红点的空间变化。 GM20在本文中是由Gontcharov在2009年推出的模型的高级版本。GM20提出了两个相交的尘埃层，沿银河中部平面和古尔德带，并具有指数垂直和正弦的垂直和正弦纵向纵向变化，每层尘埃空间密度的尘埃。皮带层是一个椭圆形的，几乎在星系的中心和抗内膜之间，分别为600和146〜PC的半高轴和半尺寸轴。 $ g_ \ mathrm {bp} -g_ \ mathrm {rp} $和$ g_ \ mathrm {rp} -w3 $提供类似的解决方案，但分别分别是赤道层的高度$ 150 \ pm15 $和$ 180 \ pm15 $ 〜pc，并且$（g_ \ mathrm {bp} -g_ \ mathrm {rp}）_ 0 =（1.14 \ pm0.01）） - （0.022 \ pm0.010）\，| z | $， $（g_ \ mathrm {rp} -w3）_0 =（1.44 \ pm0.01） - （0.015 \ pm0.010）\，| z | $，其中$ z $在kpc中。我们将GM20与几个3D红色模型和地图进行比较，并在预测观察到的颜色模式的能力中进行了比较。 GM20和Gontcharov的3D地图似乎分别是模型和地图中最好的。但是，最可靠的模型和地图主要仅在其低变红的估计中不同意，包括整个灰尘层的变红。
We exploit a complete sample of 101\,810 {\it Gaia} DR2 giants, selected in Paper I in the space cylinder with a radius of 700 pc around the Sun and a height of $|Z|=1800$ pc, using the {\it Gaia} DR2 parallaxes, $G_\mathrm{BP}$ and $G_\mathrm{RP}$ photometry, and {\it WISE} $W3$ photometry. We explain the spatial variations of the modes of the observables $G_\mathrm{BP}-G_\mathrm{RP}$ and $G_\mathrm{RP}-W3$ by the spatial variations of the corresponding reddenings described in the GM20 3D dust distribution model. Presented in this paper, GM20 is an advanced version of the model introduced by Gontcharov in 2009. GM20 proposes two intersecting dust layers, along the Galactic mid-plane and in the Gould Belt, with exponential vertical and sinusoidal longitudinal variations of the dust spatial density in each layer. The Belt layer is an ellipse, oriented nearly between the centre and anticentre of the Galaxy, and with a semi-major and semi-minor axes of 600 and 146~pc, respectively. $G_\mathrm{BP}-G_\mathrm{RP}$ and $G_\mathrm{RP}-W3$ give similar solutions, but different equatorial layer scale heights of $150\pm15$ and $180\pm15$~pc, respectively, and $(G_\mathrm{BP}-G_\mathrm{RP})_0=(1.14\pm0.01)-(0.022\pm0.010)\,|Z|$, $(G_\mathrm{RP}-W3)_0=(1.44\pm0.01)-(0.015\pm0.010)\,|Z|$, where $Z$ is in kpc. We compare GM20 with several 3D reddening models and maps in their ability to predict the observed colour modes. GM20 and the 3D map by Gontcharov appear to be the best among the models and maps, respectively. However, the most reliable models and maps mainly disagree only in their estimates of low reddening, including the reddening across the whole dust layer.
