Gas in the Universe
Atomic and molecular hydrogen constitute the bulk of neutral gas mass in the Universe, thus their role in the star formation process is self-evident. In the Early Universe galaxies whose entire mass is dominated by gas have now been identified, leading to speculations that such objects are viewed in the early stages of forming their eventual stellar populations. I will briefly review the methods of measuring the distribution of HI and H2 gas in the Universe, their short comings, and the role of molecular gas and dust in thee volution and the search for galaxies in the early stages of their formation. Finally I discuss the possibility of H2 as the dominant component of dark matter in galactic disks.
KeywordsH2 HI gas galaxy formation galaxy evolution star formation
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- Israel F. P. 1999, in it H2 in Space, F. Combes, G. Pineau des Forets (eds), Cambridge University Press, Astrophysics Series, p. 48Google Scholar
- Knapp G. R., 1990, in: The Interstellar medium in Galaxies, H.A. ThronsonJr., J.M. Shull (eds.), Kluwer Academic Publishers, p. 3Google Scholar
- Kulkarni S. R., & Heiles C, 1998, in: Galactic and Extragalactic Radio Astronomy, (2nd edition), G. L. Verschuur, K. I. Kellerman and E. Bouton (eds.), Springer-Verlag, p. 95–153.Google Scholar
- Mao R. Q., Henkel C., Schulz A., Zielinsky M., Mauersberger R., Storzer H., Wilson T. L., & Gensheimer P. 2000, 358, 433Google Scholar
- Norman C. A., & Braun R., 1996, in: Cold Gas at High Redshijt, M. N. Bremer et al. (eds.), Kluwer Academic Publishers, p. 3Google Scholar
- Scoville N Z., Yun M. S., & Bryant P. M., 1996 in CO: Twenty-Five Years of Millimeter Wave Spectroscopy, IAU Symposium 170, W.B. Latter, S.J.E. Radford, P. R. Jewell, J.G. Mangum, & J. Bally (eds). Kluwer Academic Publishers, p. 305Google Scholar
- Thaddeus P., 1996 in CO: Twenty-Five Years of Millimeter-Wave Spectroscopy, lAUSymposium 170, W. B. Latter, S. J. E. Radford, P. R. Jewell, J.G. Mangum, & J. Bally (eds). Kluwer Academic Publishers, p. 3.Google Scholar
- Turner B. E., 1988, in: Galactic and Extragalactic Radio Astronomy, (2nd edition), G. L. Verschuur, K. I. Kellerman and E. Bouton (eds.), Springer-Verlag, p. 154–199.Google Scholar
- Valentijn E. A., & van der Werf P. P. 1999, in The Universe as Seen by ISO, P. Cox & M. E Kessler. (eds) ESA-SP427, p. 821Google Scholar
- White S. D. M. 1996, in Science with Large Millimeter Arrays, P. A. Shaver (ed.) (Berlin: Springer), p. 33Google Scholar