H I absorption toward H II regions at small Galactic longitudes

C. Jones, J. M. Dickey, J. R. Dawson, N. M. McClure-Griffiths, L. D. Anderson, T. M. Bania

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We make a comprehensive study of H I absorption toward H II regions located within |l| < 10°. Structures in the extreme inner Galaxy are traced using the longitude-velocity space distribution of this absorption. We find significant H I absorption associated with the Near and Far 3 kpc Arms, the Connecting Arm, Bania's Clump 1, and the H I Tilted Disk. We also constrain the line-of-sight distances to H II regions, by using H I absorption spectra together with the H II region velocities measured by radio recombination lines.

Original languageEnglish
Article number117
Pages (from-to)1-18
Number of pages18
JournalAstrophysical Journal
Issue number2
Publication statusPublished - 10 Sept 2013
Externally publishedYes

Bibliographical note

Copyright 2013 The American Astronomical Society. First published in the Astrophysical Journal, 774(2), 117, 2013. The original publication is available at https://doi.org/10.1088/0004-637X/774/2/117, published by IOP Publishing. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


  • Galaxy: structure
  • Hii regions


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