Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98...65n&link_type=abstract
Astronomy and Astrophysics, vol. 98, no. 1, May 1981, p. 65-70.
Astronomy and Astrophysics
Astrophysics
10
Ablation, Galactic Clusters, Gas Dynamics, Intergalactic Media, Astronomical Models, Compressible Flow, Elastic Waves, Interstellar Gas, Spheres
Scientific paper
Two-dimensional, time dependent gas dynamic calculations are presented on the transonic motion of galaxies through a cluster medium. Lea and De Young's (1976) calculations are extended to include violent behavior in the center. On time scales of 10 to the 8th yr, galaxies in clusters can already lose a significant fraction of their gaseous content (up to 50% has been found in the calculations). This dynamic ablation occurs through rarefaction rather than shock heating. Explosions in spherical galaxies become effective as mechanisms for gas removal only if the galaxy moves with respect to its surroundings. Speculations are made on stripping of spiral galaxies (moving head-on in a cluster); the Gunn and Gott (1972) stripping formula is put to doubt. A method is suggested to obtain information on the state of motion of field galaxies.
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