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

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1093/mnras/stab1679
AuthorSearch for: 1ORCID identifier: https://orcid.org/0000-0002-4833-4160
Affiliation
  1. National Research Council of Canada. Herzberg Astronomy and Astrophysics
FunderSearch for: NRC
FormatText, Article
Subjectgalaxy: disc; galaxy: structure
Abstract
We observe the density wave's angular pattern speed Ωp to be near 12–17 km s⁻¹ kpc⁻¹, by the separation between a typical optical H II region (from the spiral arm's dust lane) and using a H II-evolution time model TH II 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).
Publication date
PublisherOxford Academic
In
  • Monthly Notices of the Royal Astronomical Society 506, no. 1 (11 June 2021): 523–530.
LanguageEnglish
Peer reviewedYes
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Record identifiere193d700-5418-4d25-b51d-07d1833cf4bf
Record created2024-03-01
Record modified2024-03-01
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