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

  • N. M. McClure-Griffiths (a1), John M. Dickey (a2), B. M. Gaensler (a3), A. J. Green (a4), R. F. Haynes (a5) and M. H. Wieringa (a6)...

Abstract

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.

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*

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

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References

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Caswell, J. L., & Haynes, R. F. 1987, A&A, 171, 261
Dickey, J. M., McClure-Griffiths, N., Gaensler, B., Green, A., Haynes, R., & Wieringa, M. 1999, in New Perspectives on the Interstellar Medium, ASP Conf. Ser. 168, ed. A. R. Taylor, T. L. Landecker & G. Joncas (San Francisco: ASP), p. 27
Fich, M., Blitz, L., & Stark, A. A. 1989, ApJ, 342, 272
Gibson, S. J., Taylor, A. R., Higgs, L. A., & Dewdney, P. E. 2000, ApJ, 540, 851
Kim, S., Dopita, M. A., Staveley-Smith, L., & Bessell, M. S. 1998, AJ, 118, 2797
McClure-Griffiths, N. M., Dickey, J. M., Gaensler, B. M., Green, A. J., Haynes, R. F., & Wieringa, M. H. 2000, AJ, 119, 2828
McClure-Griffiths, N. M., Green, A. J., Dickey, J. M., Gaensler, B. M., Haynes, R. F., & Wieringa, M. H. 2001, ApJ, 551, 394
Staveley-Smith, L., Sault, R. J., Hatzidimitriou, D., Kesteven, M. J., & McConnell, D. 1997, MNRAS, 289, 225
Taylor, A. R. 1999, in New Perspectives on the Interstellar Medium, ASP Conf. Ser. 168, ed. A. R. Taylor, T. L. Landecker & G. Joncas (San Francisco: ASP), p. 3

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

  • N. M. McClure-Griffiths (a1), John M. Dickey (a2), B. M. Gaensler (a3), A. J. Green (a4), R. F. Haynes (a5) and M. H. Wieringa (a6)...

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