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Title: H I ABSORPTION TOWARD H II REGIONS AT SMALL GALACTIC LONGITUDES

We make a comprehensive study of H I absorption toward H II regions located within |l| < 10 Degree-Sign . 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.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4]
  1. School of Mathematics and Physics, Private Bag 37, University of Tasmania, Hobart 7001 (Australia)
  2. CSIRO Astronomy and Space Science, ATNF, P.O. Box 76, Epping, NSW 1710 (Australia)
  3. Department of Physics, West Virginia University, Morgantown, WV 26506 (United States)
  4. Institute for Astrophysical Research, Department of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, MA 02215 (United States)
Publication Date:
OSTI Identifier:
22133894
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 774; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; ABSORPTION SPECTRA; DISTANCE; GALAXIES; HYDROGEN; RADIOWAVE RADIATION; RECOMBINATION; SPATIAL DISTRIBUTION; VELOCITY