期刊
ASTROPHYSICAL JOURNAL
卷 925, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ac3f34
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资金
- US National Science Foundation [1616177]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1616177] Funding Source: National Science Foundation
This study demonstrates that the Perseus Arm is not a continuous structure of molecular gas. The velocity perturbations near the Perseus arm can significantly impact the interpretation of the longitude-velocity diagram for more than half of the Milky Way disk. The distances to CO clouds consistent with the Perseus arm extend over 3 kpc, with potential evidence for a closer, high pitch angle structure between 1 and 1.5 kpc away.
In this work, we demonstrate that the Perseus Arm is not a continuous structure of molecular gas in the second quadrant. We first show that the observed, distanced-resolved velocity structure of the Galaxy in the outer disk is capable of creating illusory spiral arms, as was first proposed by Burton. Second, we measure the distances to a collection of CO clouds at velocities consistent with the Perseus arm with 135 degrees < l < 160 degrees. We find these distances using 3D dust maps from Green et al. We determine that these molecular clouds do not preferentially lie at the distance of a purported Perseus arm but rather extend over 3 kpc in distance, with some evidence for a closer, high pitch angle structure between 1 and 1.5 kpc away. Finally, we demonstrate that velocity perturbations of the amplitude found near the Perseus arm can wreak havoc on our interpretation of the longitude-velocity diagram for more than half of the Milky Way disk.
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