The impact of nebular emission on the ages of z ≈ 6 galaxies

被引：0
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作者：
Schaerer, D. [1 ,2 ]
De Barros, S. [1 ]
机构：
[1] Geneva Observatory, University of Geneva, 51 Ch. des Maillettes, 1290 Versoix, Switzerland
[2] Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 Avenue E. Belin, 31400 Toulouse, France
来源：
Astronomy and Astrophysics | 1600年 / 502卷 / 02期
关键词：
Alms. We examine the influence of nebular continuous and line emission in high-redshift star forming galaxies on determinations of their age; formation redshift; and other properties from SED fits. Methods. We include nebular emission consistently with the stellar emission in our SED fitting tool and analyse differentially a sample of 10 z ≈ 6 galaxies in the GOODS-S field studied earlier elsewhere. Results. We find mat the apparent Balmer/4000 breaks observed in a number of z ≈ 6 galaxies detected at 3.6 μm with IRAC/Spitzer can be mimicked by the presence of strong restframe optical emission lines; implying in particular younger ages than previously thought. Applying these models to the small sample of z ≈ 6 galaxies; we find that this effect may lead to a typical downward revision of their stellar ages by a factor ∼3. In consequence their average formation redshift may be reduced drastically; and these objects may not have contributed to cosmic reionisation at z > 6. Extinction and stellar mass estimates may also be somewhat modified; but to a lesser extent. Conclusions. Careful SED fits including nebular emission and treating properly uncertainties and degeneracies are necessary for more accurate determinations of the physical parameters of high-z galaxies. ©ESO 2009;
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页码：423 / 426
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