2006ApJ...648L...5O -
Astrophys. J., 648, L5-L8 (2006/September-1)
Clustering of i775Dropout galaxies at z ∼ 6 in GOODS and the UDF.
OVERZIER R.A., BOUWENS R.J., ILLINGWORTH G.D. and FRANX M.
Abstract (from CDS):
We measured the angular clustering at z∼6 from a large sample of i775 dropout galaxies (293 with z850≤27.5 from GOODS and 95 with z850≤29.0 from the UDF). Our largest and most complete subsample (having L≳0.5L*z=6) shows the presence of clustering at 94% significance. For this sample we derive a (comoving) correlation length of r0=4.5+2.1–3.2h–172Mpc and bias b=4.1+1.5–2.6, using an accurate model for the redshift distribution. No clustering could be detected in the much deeper but significantly smaller UDF, yielding b<4.4 (1 σ). We compare our findings to Lyman break galaxies at z∼3-5 at a fixed luminosity. Our best estimate of the bias parameter implies that i775 dropouts are hosted by dark matter halos having masses of ∼1011 M☉, similar to that of V606 dropouts at z∼5. We evaluate a recent claim that at z≳5 star formation might have occurred more efficiently compared to that at z=3-4. This may provide an explanation for the very mild evolution observed in the UV luminosity density between z=6 and 3. Although our results are consistent with such a scenario, the errors are too large to find conclusive evidence for this.
Abstract Copyright:
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Journal keyword(s):
Cosmology: Observations - Cosmology: Early Universe - Cosmology: Large-Scale Structure of Universe
Simbad objects:
3
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