4.7 Article

THE LBT BOOTES FIELD SURVEY. I. THE REST-FRAME ULTRAVIOLET AND NEAR-INFRARED LUMINOSITY FUNCTIONS AND CLUSTERING OF BRIGHT LYMAN BREAK GALAXIES AT Z ∼ 3

Journal

ASTROPHYSICAL JOURNAL
Volume 774, Issue 1, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/0004-637X/774/1/28

Keywords

galaxies: evolution; galaxies: formation; galaxies: high-redshift

Funding

  1. Packard Fellowship for Science and Engineering
  2. NSF [AST 08-06861, AST 11-07682]
  3. Direct For Mathematical & Physical Scien
  4. Division Of Astronomical Sciences [1107682, 806861] Funding Source: National Science Foundation
  5. Science and Technology Facilities Council [ST/K003119/1] Funding Source: researchfish
  6. STFC [ST/K003119/1] Funding Source: UKRI

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We present a deep LBT/LBC U-spec-band imaging survey (9 deg(2)) covering the NOAO Bootes field. A total of 14,485 Lyman break galaxies (LBGs) at z similar to 3 are selected, which are used to measure the rest-frame UV luminosity function (LF). The large sample size and survey area reduce the LF uncertainties due to Poisson statistics and cosmic variance by >= 3 compared to previous studies. At the bright end, the LF shows excess power compared to the best-fit Schechter function, which can be attributed to the contribution of z similar to 3 quasars. We compute the rest-frame near-infrared LF and stellar mass function (SMF) of z similar to 3 LBGs based on the R-band and [4.5 mu m]-band flux relation. We investigate the evolution of the UV LFs and SMFs between z similar to 7 and z similar to 3, which supports a rising star formation history in the LBGs. We study the spatial correlation function of two bright LBG samples and estimate their average host halo mass. We find a tight relation between the host halo mass and the galaxy star formation rate (SFR), which follows the trend predicted by the baryonic accretion rate onto the halo, suggesting that the star formation in LBGs is fueled by baryonic accretion through the cosmic web. By comparing the SFRs with the total baryonic accretion rates, we find that cosmic star formation efficiency is about 5%-20% and it does not evolve significantly with redshift, halo mass, or galaxy luminosity.

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