Formation of a retrograde spiral arm induced by a Ram pressure

Details Formation of a retrograde spiral arm induced by a Ram pressure Formation of a retrograde spiral arm induced by a Ram pressure

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...426l..81t&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 426, no. 2, p. 81-83

Astronomy and Astrophysics

Astrophysics

18

Galactic Structure, Intergalactic Media, Spiral Galaxies, Astronomical Models, Digital Simulation, Equations Of Motion

Scientific paper

The response of a galactic disk to a ram pressure due to an intergalactic gas is studied; it is found that the ram pressure excites a spiral structure in the disk. Development of a prominent spiral structure is demonstrated by a simple numerical simulation of a gas disk subjected to a ram pressure. The spiral structure induced by a ram pressure is a wave phenomenon, and, in contrast to the normal spiral waves, it is single-armed and slowly rotates in a retrograde direction. The sense of the spiral is trailing with respect to the pattern rotation; thus the spiral is apparently leading with respect to the galatic rotation. The spiral pattern slowly winds up in a retrograde direction.

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