SIMBAD references

2004ApJ...612..108S - Astrophys. J., 612, 108-121 (2004/September-1)

Evidence for solar metallicities in massive star-forming galaxies at z ≳ 2.


Abstract (from CDS):

We present results of near-IR spectroscopic measurements of seven star-forming galaxies at 2.1<z<2.5. Drawn from a large spectroscopic survey of galaxies photometrically preselected by their UnGR colors to lie at z∼2, these galaxies were chosen for their bright rest-frame optical luminosities (Ks≤20.0). Most strikingly, the majority of the sample of seven galaxies exhibit [N II]/Hα nebular emission-line ratios indicative of at least solar H II region metallicities, at a look-back time of 10.5 Gyr. The broadband colors of the Ks-bright sample indicate that most have been forming stars for more than a gigayear at z∼2 and have already formed stellar masses in excess of 1011M. The descendants of these galaxies in the local universe are most likely metal-rich and massive spiral and elliptical galaxies, while plausible progenitors for them can be found among the population of z∼3 Lyman break galaxies. While the Ks-bright z∼2 galaxies appear to be highly evolved systems, their large Hα luminosities and uncorrected Hα star formation rates of 24-60 M/yr indicate that active star formation is still ongoing. The luminous UV-selected objects presented here comprise more than half of the high-redshift (z>1.5) tails of current K-band-selected samples such as the K20 and Gemini Deep Deep surveys.

Abstract Copyright:

Journal keyword(s): Galaxies: Abundances - Galaxies: Evolution - Galaxies: High-Redshift

Nomenclature: Table 1: [ESS2003] Q1623-AANNN N=8 added.

Simbad objects: 2

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