On the Assembly History of Early-Type Galaxies in the Hubble Deep Field North

Details On the Assembly History of Early-Type Galaxies in the Hubble Deep Field North On the Assembly History of Early-Type Galaxies in the Hubble Deep Field North

2003-06-23

arxiv.org/abs/astro-ph/0306474v1

Astrophys.J.592:L53,2003

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the Astrophysical Journal Letters

Scientific paper

10.1086/377680

We present deep Keck spectroscopy for a sample of I<22.5 field early-type galaxies selected morphologically in the redshift range 0.56=0.88. However, we find enhanced H delta absorption of equivalent width 4.0 Angstrom in the mean spectrum of the ten galaxies, indicating the presence of young stars. We infer that the galaxies have composite stellar populations, consisting of a low mass young component in addition to a dominating old component. As the bulk of the stellar mass must have formed at z >~ 2 our results argue against formation scenarios involving major mergers of gas-rich disk systems at 1

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