Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasj...59..711w&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.59, No.4, pp.711-716
Astronomy and Astrophysics
Astronomy
1
Galaxies: Seyfert, Galaxies: Starburst, Ism: Kinematics And Dynamics
Scientific paper
Possible origins of molecular absorption discovered in some ultraluminous infrared galaxies (ULIRGs) are investigated, based on a 3-D hydrodynamic model of star-forming interstellar gas in a galactic central region. The blueshifted, warm (˜200-300 K), dense ($>106 cm-3) molecular gas suggested by the CO absorption in IRAS 08572+3915 could be caused by the innermost region of the inhomogeneous interstellar medium (ISM) around a supermassive black hole. The infrequent observations of dense gas with absorption in ULIRGs and type-2 Seyfert 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 a nonlinear development of instabilities. Since the model predicts a turbulent velocity field in the obscuring material, blue- and red-shifted gases should be observable with nearly the same probability for sufficiently large statistical samples.
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