Clustering Segregation With UV Luminosity in Lyman-Break Galaxies at z~3 and Its Implications

Abstract

We report on the clustering properties of Lyman-break galaxies (LBGs) at z~3. The correlation length of flux-limited samples of LBGs depends on their rest-frame ultraviolet (UV) luminosity at lambda ~1700 Angstrom, with fainter galaxies being less strongly clustered in space. It decreases by a factor ~3 over the range of limiting magnitudes that we have probed, namely 25<R<27, suggesting that fainter samples include galaxies with smaller mass. We find that: 1) the clustering strength of LBGs follows, within the errors, the same scaling law with the volume density predicted for cold dark matter (CDM) halos; 2) the scaling law predicted for the galaxies using the halos mass spectrum and a number of models for the relationship that maps the halos' mass into the galaxies' UV luminosity depends only on how tightly mass and UV luminosity correlate, but is otherwise insensitive to the details of the models. These results provide additional evidence that the strong spatial clustering of LBGs is due to galaxy biasing, supporting biased galaxy formation and gravitational instability as the primary mechanism for the formation of structure. We also find that 1) a scale invariant relationship between mass and UV luminosity (e.g. a power law) is not supported, suggesting that the properties of star formation of galaxies change along the mass spectrum of the observed LBGs; 2) the scatter of the UV luminosity of LBGs of given mass must be relatively small for massive LBGs, suggesting that the mass is an important parameter in regulating the activity of star formation in these systems, and that the fraction of massive halos at z~3 that are not observed in UV-selected surveys is not large.

Corrected a few typos and added a reference. 36 pages, 8 figures, Latex, AAS macros, to appear on the Astrophysical Journal

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