Giant shells around normal elliptical galaxies

Details Giant shells around normal elliptical galaxies Giant shells around normal elliptical galaxies

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.285..643m&link_type=abstract

Nature, vol. 285, June 26, 1980, p. 643-645.

Astronomy and Astrophysics

Astronomy

146

Astronomical Photography, Elliptical Galaxies, Galactic Evolution, Intergalactic Media, Photointerpretation, Brightness, Schmidt Telescopes

Scientific paper

Photographic enhancement of deep IIIaJ and IIIaF plates taken with the UK Schmidt and Anglo-Australian telescopes reveals the existence of giant ellipsoidal shells within and around the envelopes of several normal elliptical galaxies. The dimensions of these features are vast; they occur at radii of up to 180 kpc (assuming H(0) = 50 km/s Mpc). It is reported that these features probably consist of stars and are either the result of a burst of star formation initiated by a powerful shock wave in an intergalactic medium, perhaps during the formation of the galaxies, or are old stars displaced from the nucleus by an explosive event.

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