SIMBAD references

2007ApJ...660...47D - Astrophys. J., 660, 47-61 (2007/May-1)

Spectroscopy of z ∼ 6 i-dropout galaxies: frequency of Lyα emission and the sizes of Lyα-emitting galaxies.

DOW-HYGELUND C.C., HOLDEN B.P., BOUWENS R.J., ILLINGWORTH G.D., VAN DER WEL A., FRANX M., VAN DOKKUM P.G., FORD H., ROSATI P., MAGEE D. and ZIRM A.

Abstract (from CDS):

We report on deep spectroscopy, using LRIS on Keck I and FORS2 on the VLT, of a sample of 22 candidate z∼6 Lyman break galaxies (LBGs) selected by the i775-z850>1.3 dropout criterion. Redshifts could be measured for eight objects. These redshifts are all in the range z=5.5-6.1, confirming the efficiency of the i775-z850 color selection technique. Six of the confirmed galaxies show Lyα emission. Assuming that the 14 objects without redshifts are z∼6 LBGs that lack detectable Lyα emission lines, we infer that the fraction of Lyα-emitting LBGs with Lyα equivalent widths greater than 20 Å among z∼6 LBGs is ~30%, similar to that found at z∼3. Every Lyα-emitting object in our sample is compact, with half-light radii rhl≤0.14". Furthermore, all the Lyα-emitting objects in our sample are more compact than average relative to the observed size-magnitude relation of a large i-dropout sample (332 candidate z∼6 objects). We can reject the hypothesis that the Lyα-emitting population is a subset of the rest of the z∼6 LBG population at >97% confidence. We speculate that the small sizes of the Lyα-emitting LBGs are due to these objects being less massive than other LBGs at z∼6.

Abstract Copyright:

Journal keyword(s): Cosmology: Early Universe - Galaxies: Evolution - Galaxies: Formation - Galaxies: High-Redshift - Galaxies: Starburst

Nomenclature: Fig.10, Tables 1, 3: [DHB2007] BD NN N=14 among (Nos 00-66). Fig.10, Tables 2, 4: [DHB2007] UDF PFs1 iN (Nos i0, i1, i9), [DHB2007] UDF PFs iN N=5 among (Nos i0-i9), [DHB2007] GOODS i6 0 N=1.

Simbad objects: 28

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