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H I Emission and Absorption in the Southern Galactic Plane Survey*

Published online by Cambridge University Press:  05 March 2013

N. M. McClure-Griffiths ,
John M. Dickey ,
B. M. Gaensler ,
A. J. Green ,
R. F. Haynes  and
M. H. Wieringa
N. M. McClure-Griffiths
Affiliation:
Department of Astronomy, University of Minnesota, 116 Church St SE, Minneapolis, MN 55455, USA; naomi@astro.umn.edu
John M. Dickey
Affiliation:
Department of Astronomy, University of Minnesota, 116 Church St SE, Minneapolis, MN 55455, USA; john@astro.umn.edu
B. M. Gaensler
Affiliation:
Center for Space Research, Massachusetts Institute of Technology, 70 Vassar St, Cambridge, MA 02139, USA; bmg@space.mit.edu
A. J. Green
Affiliation:
Astrophysics Department, School of Physics, Sydney University, NSW 2006, Australia; agreen@physics.usyd.edu.au
R. F. Haynes
Affiliation:
Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 2121, Australia; Raymond.Haynes@atnf.csiro.au
M. H. Wieringa
Affiliation:
Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 2121, Australia; Mark.Wieringa@atnf.csiro.au
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Abstract

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We present preliminary results from the Southern Galactic Plane Survey (SGPS) Test Region and Parkes data. As part of the pilot project for the Southern Galactic Plane Survey, observations of a Test Region (325·5° ≤l ≤ 333·5°; −0·5° ≤ b ≤ 3·5°) were completed in December 1998. Single-dish observations of the full survey region (253° ≤ l ≤ 358 ° |b| ≤ 1°) with the Parkes Radio Telescope were completed in March 2000. We present a sample of SGPS H I data, with particular attention to the smallest-and largest-scale structures seen in absorption and emission, respectively. On the large scale, we detect many prominent H I shells. On the small scale, we note extremely compact, cold clouds seen in H I self-absorption. We explore how these two classes of objects probe opposite ends of the H I spatial power spectrum.

Keywords

GalaxyISM: bubbles, clouds,structure
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 18 , Issue 1 , 2001 , pp. 84 - 90
Copyright
Copyright © Astronomical Society of Australia 2001

Footnotes

*

Given as an oral presentation at ASA2K, Hobart, Tasmania, Australia, July 2000

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