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Kinematic distance assignments with HI absorption

Citation

Jones, C and Dickey, JM, Kinematic distance assignments with HI absorption, Astrophysical Journal, 753, (1) Article 62. ISSN 0004-637X (2012) [Refereed Article]


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Copyright Statement

Copyright 2012 The American Astronomical Society

DOI: doi:10.1088/0004-637X/753/1/62

Abstract

Using HI absorption spectra from the International Galactic Plane Survey, a new method is implemented to resolve the kinematic distance ambiguity for 75 HII regions with known systemic velocities from radio recombination lines. A further 40 kinematic distance determinations are made for HII region candidates without known systemic velocities through an investigation of the presence of HI absorption around the terminal velocity. New kinematic distance determinations can be used to further constrain spiral arm parameters and the location and extent of other structures in the Milky Way disk. HI absorption toward continuum sources beyond the solar circle is also investigated. Follow-up studies of HI at higher resolution than the 1' to 2' of existing Galactic Plane Surveys will provide kinematic distances to many more HII regions on the far side of the Galactic center. On the basis of the velocity channel summation technique developed in this paper, a much larger sample of HII regions will be analyzed in a future paper to remove the near-far distance ambiguity.

Item Details

Item Type:Refereed Article
Keywords:Galaxy: structure HII regions
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Jones, C (Mrs Courtney Brown)
Author:Dickey, JM (Professor John Dickey)
ID Code:79933
Year Published:2012
Web of Science® Times Cited:17
Deposited By:Mathematics and Physics
Deposited On:2012-10-15
Last Modified:2013-07-02
Downloads:0

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