naa a22 4500 51078996X CHVBK 20180411083316.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1134/S1063773713080057 doi (NATIONALLICENCE)springer-10.1134/S1063773713080057 Accumulation of mass in accelerating self-gravitating gas layers [Elektronische Daten] [K. Krasnobaev, R. Tagirova] The two-dimensional motions of a plane layer of self-gravitating gas accelerated by the pressure difference on both sides of the layer have been simulated numerically. The change in the shape of the layer surface has been found to depend significantly on the ratio of gravity and the pressure difference. In the region where the forces of gravitational attraction between the particles of the medium are greater than or of the order of the pressure difference on the layer sides, the structure of the condensations is such that the differences in inhomogeneity scales in the longitudinal and transverse directions with respect to the unperturbed motion decrease significantly compared to the Rayleigh-Taylor instability. Allowance for the self-gravity leads to a considerable increase in the maximum density in the layer. It is shown that the instability of the shell formed during the propagation of the ionization-shock front can be responsible for the emergence of an inhomogeneous structure of the HII region RCW 82, with the instability growth time being less than the estimated age of the HII region. Pleiades Publishing, Ltd., 2013 interstellar medium nationallicence two-dimensional unsteady motions nationallicence perfect gas nationallicence instability of self-gravitating media nationallicence Krasnobaev K. Department of Physics, Moscow State University, 119992, Moscow, Russia aut Tagirova R. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, 117997, Moscow, Russia aut Astronomy Letters Springer US; http://www.springer-ny.com 39/9(2013-09-01), 578-585 1063-7737 39:9<578 2013 39 11443 https://doi.org/10.1134/S1063773713080057 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063773713080057 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Krasnobaev K. Department of Physics, Moscow State University, 119992, Moscow, Russia aut NATIONALLICENCE 700 1- Tagirova R. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, 117997, Moscow, Russia aut NATIONALLICENCE 773 0- Astronomy Letters Springer US; http://www.springer-ny.com 39/9(2013-09-01), 578-585 1063-7737 39:9<578 2013 39 11443 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer