Intergalactic shells at large redshift

Details Intergalactic shells at large redshift Intergalactic shells at large redshift

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249...26s&link_type=abstract

Astrophysical Journal, Part 1, vol. 249, Oct. 1, 1981, p. 26-34.

Astronomy and Astrophysics

Astronomy

22

Background Radiation, Cosmic Rays, Galactic Evolution, Intergalactic Media, Red Shift, Abundance, Compton Effect, Lyman Alpha Radiation, Ultraviolet Astronomy

Scientific paper

The intergalactic shells produced by galactic explosions at large redshift, whose interiors cool by inverse Compton scattering off the cosmic background radiation, have a characteristic angular size of about 1 arcmin at peak brightness. At z values lower than 2, the shells typically have a radius of 0.5 Mpc, a velocity of about 50 km/sec, a metal abundance of about 0.0001 of cosmic values, and strong radiation in H I(Lyman-alpha), He II 304 A, and the IR fine-structure lines of C II and Si II. The predicted extragalactic background emission from many shells, strongly peaked toward the UV, sets an upper limit to the number of exploding sources at z values of about 10. Shell absorption lines of H I, C II, Si II, and Fe II, which may be seen at more recent epochs in quasar spectra, may probe otherwise invisible explosions in the early universe.

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