Surface photometry and structure of high redshift disk galaxies in the HDF-S NICMOS field

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作者：
Tamm, A. [1 ,2 ]
Tenjes, P. [1 ,2 ]
机构：
[1] Institute of Theoretical Physics, Tartu University, Tähe 4, Tartu, 51010, Estonia
[2] Tartu Observatory, Tõravere, Tartumaa, 61602, Estonia
来源：
Astronomy and Astrophysics | 1600年 / 449卷 / 01期
关键词：
Aims. We report on a photometric study of a sample of 22 disk galaxies in the Hubble Deep Field South NICMOS parallel field. The redshift range of the galaxies is z = 0.5-2.6. Methods. We use deep NICMOS J and H band and STIS open mode images; taken as part of the HDF-S project; to construct rest-frame B-profiles and (U - V) color profiles of the galaxies. Before fitting isophotes; images are deconvolved with PSF. Derived surface brightness profiles are approximated by Sérsic luminosity distribution. Results. Significantly large population of disks cannot be represented by an exponential disk; but this can be well done by Sérsic law; if n e(z)/re(0) = 1 - 0.26z. The rest frame (U - V) color shows a clear decrease at z 2; concordantly with the understanding of more intense star formation at earlier epochs. Color gradients Δ(U - V)/Δr are small and roughly constant at z 2; dominantly positive gradients appear; possibly indicating centrally concentrated star-formation. On the basis of (U - V) color and chemical evolution models; the disks observed at z ∼ 2.5 have formed between z = 3.5-7. Scale radii r e of the galaxies correlate with the scale surface brightnesses μe for the sample. None of the studied parameters shows clear dependence on absolute B luminosity for the galaxies. © ESO 2006;
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页码：67 / 78
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