Luminous arcs from galactic bow shocks

Details Luminous arcs from galactic bow shocks Luminous arcs from galactic bow shocks

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.330...46b&link_type=abstract

Nature (ISSN 0028-0836), vol. 330, Nov. 5, 1987, p. 46-48. Research supported by the Alfred P. Sloan Foundation, Rockwell Intern

Astronomy and Astrophysics

Astronomy

5

Astronomical Models, Bow Waves, Elliptical Galaxies, Gas Dynamics, Shock Waves, Galactic Clusters, Galactic Structure, Star Formation, X Ray Spectroscopy

Scientific paper

Circular arcs in the cores of two high-redshift (z ≡ 0.3) clusters have been discovered. Giant elliptical galaxies are found near the centres of both arcs. The arcs have total luminosities of ≡1044erg s-1 and are unusually blue in colour. One explanation for the arcs is that they are regions of rapid star formation behind galaxy bow shocks, where our line of sight is tangent to the shock surface and approximately perpendicular to the galaxy velocity. Here the authors describe some of the conditions under which bow shocks can form and point out some observationally testable implications of this model.

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