A low density wave's spiral pattern speed, from the tracer separations (age gradient) across a spiral arm in the Milky Way

被引：7
作者：
Vallee, Jacques P. [1 ]
机构：
[1] Natl Res Council Canada, Herzberg Astron & Astrophys, 5071 West Saanich Rd, Columbia, BC V9E 2E7, Canada
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2021年 / 506卷 / 01期
关键词：
Galaxy: disc; Galaxy: structure; GAS-DYNAMICS; OFFSETS; MASERS; PITCH;
D O I：
10.1093/mnras/stab1679
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We observe the density wave's angular pattern speed ohm(p) to be near 12-17kms(-1)kpc(-1), by the separation between a typical optical Hii region (from the spiral arm's dust lane) and using a Hii-evolution time model T-Hii to yield its relative speed, and independently by the separation between a typical radio maser (from the spiral arm's dust lane) with a maser model. The assumption of a fixed circular rotational speed of the gas and stars with galactic radius is employed (neglecting spiral perturbation at mid-radii, nuclear bar influence at small radii, and tidal effects at large radii).
引用
收藏
页码：523 / 530
页数：8
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