论文标题
银河系中的武器岛 - 西根氏螺旋臂附近的岛屿
Interarm islands in the Milky Way -- the one near the Cygnus spiral arm
论文作者
论文摘要
这项研究扩展到银河系的结构。我们的主要目标是通过评估Cygnus Arm附近的Masers的分布来专注于珀尔修斯臂以外的第一个螺旋臂，通常称为Cygnus臂或外部Norma手臂。该方法是雇用以精确度测量三角距离的masers。 MASER数据来自已出版的文献，是通过现有网络（美国VLBA，日本Vera，欧洲VLBI和澳大利亚LBA）获得的。 Cygnus的新结果分为两组：位于最近拟合的全球模型螺旋臂附近的结果，以及聚集在珀尔修斯臂和Cygnus Arm之间的中间的武器岛中的螺旋臂。接下来，我们将这个岛与其他螺旋臂附近的其他类似的武器中的物体进行比较。因此，我们描绘了一个位于两个长螺旋臂（Cygnus和Perseus Arms）之间的一组武器岛（6 x 2 kpc）；这让人联想到较早在皇家和射手座臂之间发现的小型本地猎户座臂（4 x 2 kpc），以及旧环（2 x 0.5 kpc）早些时候在射手座和斯卡特姆臂之间发现的旧环（2 x 0.5 kpc）。根据观察数据（MASER，HII区域，HI GAS，Young Star，CO GAS）比较各种ARM模型。
This study extends to the structure of the Galaxy. Our main goal is to focus on the first spiral arm beyond the Perseus arm, often called the Cygnus arm or the Outer Norma arm, by appraising the distributions of the masers near the Cygnus arm. The method is to employ masers whose trigonometric distances were measured with accuracy. The maser data come from published literature, having been obtained via the existing networks (US VLBA, the Japanese VERA, the European VLBI, and the Australian LBA). The new results for Cygnus are split in two groups: those located near a recent CO fitted global model spiral arm, and those congregating within an interarm island located halfway between the Perseus arm and the Cygnus arm. Next, we compare this island with other similar interarm objects near other spiral arms. Thus we delineate an interarm island (6 x 2 kpc) located between the two long spiral arms (Cygnus and Perseus arms); this is reminiscent of the small Local Orion arm (4 x 2 kpc) found earlier between the Perseus and Sagittarius arms, and of the old Loop (2 x 0.5 kpc) found earlier between the Sagittarius and Scutum arms. Various arm models are compared, based on observational data (masers, HII regions, HI gas, young stars, CO gas).
