Dating the stellar population in massive early-type galaxies at $z\sim$1.5

Details Dating the stellar population in massive early-type galaxies at $z\sim$1.5 Dating the stellar population in massive early-type galaxies at $z\sim$1.5

2005-05-23

arxiv.org/abs/astro-ph/0505467v1

Mon.Not.Roy.Astron.Soc. 361 (2005) 897-906

Astronomy and Astrophysics

Astrophysics

11 pages, 6 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2005.09215.x

We present the analysis of 10 massive early-type galaxies at $z\sim1.5$. They have been identified by means of a near-IR low resolution spectroscopic follow-up of a complete sample of 36 bright (K' $<$ 18.5) Extremely Red Objects (EROs, R-K'$>$ 5) selected from the Munich Near-IR ClusterSurvey (MUNICS; Drory et al. 2001). The low resolution near-IR spectra constrain their redshift at $1.2 2$ for all the galaxies and $z_{f} \geq 4$ for the oldest ones. The comparison of the 4000\AA break and of the overall spectral shape of the average spectrum of the 10 galaxies at $z\sim1.5$ with those of their local counterpartsconfirms that field massive early-type galaxies formed the bulk of their stellar mass at $2

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