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

Pieter van Dokkum | Zendy; Richard S. Ellis | Zendy

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

Author(s) -

Pieter van Dokkum,

Richard S. Ellis

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/377680

Subject(s) - physics , astrophysics , redshift , galaxy , elliptical galaxy , fundamental plane (elliptical galaxies) , astronomy , balmer series , galaxy group , lenticular galaxy , spectral line , emission spectrum

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

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