Comparison of Massive Galaxies at Early Times vs. Today

Comparison of Massive Galaxies at Early Times vs. Today

Massive galaxies today are substantially larger and more bulgy than massive galaxies 10 billion years ago. The left column illustrates the difference in size by comparing a face-on view of the massive present-day elliptical galaxy (NGC 4472) to the Hubble NICMOS image of a face-on ultra-compact galaxy from 10 billion years ago. The right column highlights the disky nature of massive young galaxies by contrasting an edge-on view of a modern bulge-dominated spiral (NGC 4594, the Sombrero Galaxy) with the an edge-on view of a massive disky galaxy from 10 billion years ago. Credit: T. Weinzirl, S. Jogee (U. Texas)/STScI/NASA/SDSS

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