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arXiv:0706.2890 (astro-ph)
[Submitted on 19 Jun 2007]

Title:Origin of Warm High-Velocity Dense Gas in ULIRGs

Authors:Keiichi Wada (National Astronomical Observatory of Japan)
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Abstract: Possible origins of the molecular absorption discovered in some ULIRGs are investigated, based on a 3-D hydrodynamic model of star-forming interstellar gas in a galactic central region. The blue-shifted, warm ($\sim 200-300$ K), dense ($>10^6$ cm$^{-3}$) molecular gas suggested by CO absorption in IRAS 08752+3915 could be caused by the innermost region of the inhomogeneous inter-stellar medium (ISM) around a supermassive black hole. The infrequent observations of the dense gas with absorption in ULIRGs and Seyfert 2 galaxies could simply suggest that the high-density regions occupy only a very small volume fraction of the obscuring material. This is naturally expected if the inhomogeneous structure of the ISM is caused by non-linear development of instabilities. The model predicts a turbulent velocity field in the obscuring material, therefore blue- and red-shifted gases should be observable with nearly the same probability for the large enough statistical samples.
Comments: 14 pages, 6 figures. Publications of Astronomical Society of Japan in press
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.2890 [astro-ph]
  (or arXiv:0706.2890v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.2890
Related DOI: https://doi.org/10.1093/pasj/59.4.711

Submission history

From: Keiichi Wada [view email]
[v1] Tue, 19 Jun 2007 23:14:21 UTC (1,126 KB)
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