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Title: A SUBSTRUCTURE INSIDE SPIRAL ARMS, AND A MIRROR IMAGE ACROSS THE GALACTIC MERIDIAN

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 {sup 12}CO 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)
Authors:
 [1]
  1. National Research Council Canada, Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, B.C., V9E 2E7 (Canada)
Publication Date:
OSTI Identifier:
22518482
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 821; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ARMS; ATOMS; CARBON 12; CARBON MONOXIDE; COSMIC GASES; DENSITY; HYDROGEN; IMAGES; MASERS; MILKY WAY; MIRRORS; RECOMBINATION; STAR CLUSTERS