A substructure inside spiral arms and a mirror image across the galactic meridian

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.3847/0004-637X/821/1/53
AuthorSearch for: 1 
Name affiliation
  1. National Research Council Canada. National Science Infrastructure
FormatText
TypeArticle
Journal titleThe Astrophysical Journal
ISSN1538-4357
Volume821
Issue1
Article number53
Pages1–12
SubjectDisc galaxy; Galaxy formation; Galaxy: fundamental parameters; Galaxy structure; ISM kinematics and dynamics
Abstract
Though the galactic density wave theory is over 50 years old and is well known in science, it has been difficult to say whether it fits our own Milky Way disk. Here we show a substructure inside the spiral arms. This substructure is reversing with respect to the Galactic Meridian (longitude zero), and crosscuts of the arms at negative longitudes appear as mirror images of crosscuts of the arms at positive longitudes. Four lanes are delineated: a mid-arm (extended ¹²CO gas at the mid-arm, H i atoms), an in-between offset by about 100 pc (synchrotron, radio recombination lines), an in-between offset by about 200 pc (masers, colder dust), and an inner edge (hotter dust seen in mid-IR and near-IR).
Publication date
PublisherIOP Publishing
LanguageEnglish
Peer reviewedYes
NPARC number23000424
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Record created2016-07-15
Record modified2016-07-15
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