Instabilities and star formation within ionization-shock fronts

Details Instabilities and star formation within ionization-shock fronts Instabilities and star formation within ionization-shock fronts

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..219g&link_type=abstract

Astrophysical Journal, Part 1, vol. 242, Nov. 15, 1980, p. 219-225.

Other

5

Gas Ionization, Shock Fronts, Star Formation, Gravitational Effects, H Ii Regions, Magnetohydrodynamic Stability, Photons, Rates (Per Time)

Scientific paper

The maximum growth rate of the fastest growing wavelength for the photon-driven slab (PDS) instability of ionization-shock (IS) fronts is compared with that for the gravitational instability of shock-compressed slabs. For the both instabilities the maximum growth rate changes in time due to the increasing column density of the slab. It is shown that the PDS instability can dominate the gravitational one until large column densities are attained with the IS front. The equivalent time span is extremely long in low-density H II regions with high velocity fronts, and it may also be significant in other regimes. It is suggested that the process of star formation in compressed IS slabs may be delayed or inhibited until the gravitational growth rates exceed those of the PDS instability.

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