Morphologies of Two Massive Old Galaxies at z ~ 2.5

Details Morphologies of Two Massive Old Galaxies at z ~ 2.5 Morphologies of Two Massive Old Galaxies at z ~ 2.5

2007-10-02

arxiv.org/abs/0710.0426v2

Astronomy and Astrophysics

Astrophysics

Accepted by ApJ; 8 pages, 8 figures, emulateapj format; replaced Fig. 6 with correct version

Scientific paper

10.1086/523789

We present the results of NICMOS imaging of two massive galaxies photometrically selected to have old stellar populations at z ~ 2.5. Both galaxies are dominated by apparent disks of old stars, although one of them also has a small bulge comprising about 1/3 of the light at rest-frame 4800 A. The presence of massive disks of old stars at high redshift means that at least some massive galaxies in the early universe have formed directly from the dissipative collapse of a large mass of gas. The stars formed in disks like these may have made significant contributions to the stellar populations of massive spheroids at the present epoch.

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