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Extremely Red Galaxies: Old or Dusty ?

Andrea Cimatti, Paola Andreani, Huub Röttgering, Remo Tilanus

astro-pharXiv:astro-ph/9810004

Abstract

The nature of the extremely red galaxies is poorly known, the critical issue being whether they are old ellipticals at z>1.5 or distant star-forming galaxies strongly reddened by dust extinction. Here we review the little we know about them, and we present recent and preliminary results from our ongoing submillimeter -- millimeter observations.

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