Computer Science
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.577..287j&link_type=abstract
In: Proceedings of the dusty and molecular universe: a prelude to Herschel and ALMA, 27-29 October 2004, Paris, France. Ed. by A
Computer Science
Molecular Clouds, Galaxies: Kinematics And Dynamics
Scientific paper
We study the dynamical effects of a molecular cloud complex with a typical mass of ~107Msolar and a size ~ a few 100 pc, on the vertical distribution of the stars and the atomic hydrogen gas (HI) in a galactic disk. The extended mass distribution in a complex, with an average mass density six times larger than the Oort limit, is shown to dominate the gravitational field around itself. This results in a reduction of the vertical scaleheights of stars and HI gas to less than 1/3 of their initial values. Surprisingly, the complex influences the vertical disk distribution upto a large radial distance of ~500 pc from its centre. The net result of many such complexes in a disk is that: first, the galactic disk potential is distinctly non-uniform on scales of the inter-complex separation of about 1 kpc; and second, the scaleheights of stars and HI show local corrugations.
Jog Chanda J.
Narayan Chaitra A.
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