Premium
Two‐component outer ring and the observed galactic spiral structure
Author(s) -
Mel'nik A.M.,
Rautiainen P.
Publication year - 2013
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.201311920
Subject(s) - physics , spiral galaxy , spiral (railway) , component (thermodynamics) , ring (chemistry) , galaxy , astrophysics , geometry , mathematics , chemistry , mathematical analysis , organic chemistry , thermodynamics
We show that a model of the Galaxy with a two‐component outer ring of class R 1 R 2 can explain many large‐scale morphological features of the galactic spiral structure. The Carina‐Sagittarius arm may consist of two ascending segments of outer R 1 and R 2 rings, which almost touch each other near the Carina region. The Perseus and Crux arms can be partially identified with the descending segments of the R 2 ring. A model of a two‐component outer ring can also explain the existence of some tangential directions. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)