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Title: Galactic Neutral Hydrogen Emission Profile Structure

Abstract

Analysis of Galactic neutral hydrogen emission profiles that have been corrected for sidelobe radiation confirm the existence of three distinct component line width regimes identified by Verschuur and Magnani in 1994. In addition, a fourth becomes recognizable in the data in directions of low total column density. The line width regimes are around 50 km s{sup -1} (component 1a), 31 km s{sup -1} (component 1b), 13 km s{sup -1} (component 2), and 5.2 km s{sup -1} for the narrow lines arising from cool H i (component 3). In this paper, the new data are presented and compared with previously published results. The possible origin of the distinct line width regimes is briefly examined, and it is concluded that a new interpretation is needed, one that involves a plasma phenomenon known as the critical ionization velocity, which will be fully discussed in a subsequent paper. (c) (c) 1999. The American Astronomical Society.

Authors:
;
Publication Date:
OSTI Identifier:
20215990
Resource Type:
Journal Article
Journal Name:
Astronomical Journal
Additional Journal Information:
Journal Volume: 118; Journal Issue: 3; Other Information: PBD: Sep 1999; Journal ID: ISSN 0004-6256
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; MILKY WAY; INTERSTELLAR SPACE; COSMIC GASES; HYDROGEN; EMISSION SPECTRA; LINE WIDTHS; EXPERIMENTAL DATA

Citation Formats

Verschuur, Gerrit L., and Peratt, Anthony L. Galactic Neutral Hydrogen Emission Profile Structure. United States: N. p., 1999. Web. doi:10.1086/300998.
Verschuur, Gerrit L., & Peratt, Anthony L. Galactic Neutral Hydrogen Emission Profile Structure. United States. doi:10.1086/300998.
Verschuur, Gerrit L., and Peratt, Anthony L. Wed . "Galactic Neutral Hydrogen Emission Profile Structure". United States. doi:10.1086/300998.
@article{osti_20215990,
title = {Galactic Neutral Hydrogen Emission Profile Structure},
author = {Verschuur, Gerrit L. and Peratt, Anthony L.},
abstractNote = {Analysis of Galactic neutral hydrogen emission profiles that have been corrected for sidelobe radiation confirm the existence of three distinct component line width regimes identified by Verschuur and Magnani in 1994. In addition, a fourth becomes recognizable in the data in directions of low total column density. The line width regimes are around 50 km s{sup -1} (component 1a), 31 km s{sup -1} (component 1b), 13 km s{sup -1} (component 2), and 5.2 km s{sup -1} for the narrow lines arising from cool H i (component 3). In this paper, the new data are presented and compared with previously published results. The possible origin of the distinct line width regimes is briefly examined, and it is concluded that a new interpretation is needed, one that involves a plasma phenomenon known as the critical ionization velocity, which will be fully discussed in a subsequent paper. (c) (c) 1999. The American Astronomical Society.},
doi = {10.1086/300998},
journal = {Astronomical Journal},
issn = {0004-6256},
number = 3,
volume = 118,
place = {United States},
year = {1999},
month = {9}
}