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

DOI	Resolve DOI: https://doi.org/10.3847/0004-637X/821/1/53
Author	Search for: Vallée, Jacques P.¹
Name affiliation	National Research Council Canada. National Science Infrastructure
Format	Text
Type	Article
Journal title	The Astrophysical Journal
ISSN	1538-4357
Volume	821
Issue	1
Article number	53
Pages	1–12
Subject	Disc 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	2016-04-11
Publisher	IOP Publishing
Language	English
Peer reviewed	Yes
NPARC number	23000424
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Record identifier	4df1ca4a-a16a-436a-b97c-695fdeb43591
Record created	2016-07-15
Record modified	2016-07-15