Journal
ASTROPHYSICAL JOURNAL
Volume 925, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ac3f34
Keywords
-
Categories
Funding
- US National Science Foundation [1616177]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1616177] Funding Source: National Science Foundation
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available