Number Density of Bright Lyman-Break Galaxies at z~6 in the Subaru Deep Field

Abstract

We report on the bright Lyman-break galaxies (LBGs) selected in a 767 arcmin^2 area of the Subaru Deep Field. The selection is made in the i-zR vs zB-zR plane, where zB and zR are new bandpasses with a central wavelength of 8842A and 9841A, respectively. This set of bandpasses enables us to separate well z~6 LBGs from foreground galaxies and Galactic cool stars. We detect 12 LBG candidates down to zR=25.4, and calculate the normalization of the rest-frame far-ultraviolet (FUV: 1400A) luminosity function at MFUV = -21.6 to be ϕ(-21.6) = (2.6+/-0.7) x 10^{-5} mag^{-1} Mpc^{-3}. This must be the most reliable measurement ever obtained of the number density of bright z~6 LBGs, because it is more robust against both contamination and cosmic variance than previous values. The FUV luminosity density contributed from LBGs brighter than MFUV = -21.3 is (2.8+/-0.8) x 10^{24} ergs/s/Hz/Mpc^3, which is equivalent to a star formation rate density of (3.5+/-1.0) x 10^{-4} Msun/yr/Mpc^3. Combining our measurement with those at z<6 in the literature, we find that the FUV luminosity density of bright galaxies increases by an order of magnitude from z~6 to z~3 and then drops by 10^3 from z~3 to the present epoch, while the evolution of the total luminosity density is much milder. The evolutionary behavior of bright LBGs resembles that of luminous dusty star-forming galaxies and bright QSOs. The redshift of z~3 appears to be a remarkable era in the cosmic history when massive galaxies were being intensively formed.

12 pages, accepted for PASJ, a high resolution version is available at http://hikari.astron.s.u-tokyo.ac.jp/~shima/z6LBGs/

References in corpus (13)

• A Redshift Survey of the Submillimeter Galaxy Population
• On the evolution of star forming galaxies
• Subaru Deep Survey V. A Census of Lyman Break Galaxies at z=4 and 5 in the Subaru Deep Fields: Photometric Properties
• Old Galaxies in the Young Universe
• Galaxy Size Evolution at High Redshift and Surface Brightness Selection Effects: Constraints from the Hubble Ultra Deep Field
• The Discovery of Primeval Large-Scale Structures with Forming Clusters at Redshift 6
• The GALEX-VVDS Measurement of the Evolution of the 1500A Luminosity Function
• Evolved Galaxies at z > 1.5 from the Gemini Deep Deep Survey: The Formation Epoch of Massive Stellar Systems
• The Subaru Deep Field: The Optical Imaging Data
• A population of hot, dusty ultra-luminous galaxies at z~2
• The host galaxies of luminous quasars
• Candidates of z ~ 5.5--7 Galaxies in the HST Ultra Deep Field
• A Strong Lyman-alpha Emitter at z=6.33 in the Subaru Deep Field Selected as an i' Dropout

Cited by in corpus (59)

• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• UV Luminosity Functions at z~4, 5, and 6 from the HUDF and other Deep HST ACS Fields: Evolution and Star Formation History
• The Subaru/XMM-Newton Deep Survey (SXDS). IV. Evolution of Lya Emitters from z=3.1 to 5.7 in the 1 deg^2 Field: Luminosity Functions and AGN
• UV Continuum Slope and Dust Obscuration from z~6 to z~2: The Star Formation Rate Density at High Redshift
• A unified multi-wavelength model of galaxy formation
• Discovery of z~8 Galaxies in the HUDF from ultra-deep WFC3/IR Observations
• Galaxies at z~6: The UV Luminosity Function and Luminosity Density from 506 UDF, UDF-Ps, and GOODS i-dropouts
• Ly Alpha Emitters at z=5.7 in the Subaru Deep Field
• Large Area Survey for z=7 Galaxies in SDF and GOODS-N: Implications for Galaxy Formation and Cosmic Reionization
• z~7-10 Galaxies in the HUDF and GOODS fields, and their UV Luminosity Functions
• Cosmic evolution of submillimeter galaxies and their contribution to stellar mass assembly
• Great Optically Luminous Dropout Research Using Subaru HSC (GOLDRUSH). I. UV Luminosity Functions at $z\sim 4-7$ Derived with the Half-Million Dropouts on the 100 deg${}^2$ Sky
• Spectroscopic Observations of Lyman-Break Galaxies at Redshift ~ 4, 5 and 6 in the GOODS-South Field
• The luminosity function, halo masses and stellar masses of luminous Lyman-break galaxies at redshifts 5<z<6
• The Lyman alpha morphology of local starburst galaxies: release of calibrated images
• The Subaru COSMOS 20: Subaru Optical Imaging of the HST COSMOS Field with 20 Filters
• The Subaru high-z quasar survey: discovery of faint z~6 quasars
• LCDM predictions for galaxy protoclusters I: the relation between galaxies, protoclusters and quasars at z~6
• Deficiency of large equivalent width Lyman-alpha emission in luminous Lyman break galaxies at z~5-6?
• Clustering of Lyman Break Galaxies at z=4 and 5 in The Subaru Deep Field: Luminosity Dependence of The Correlation Function Slope
• The bright end of the z ~ 7 UV Luminosity Function from a wide and deep HAWK-I survey
• A New Constraint on Reionization from Evolution of the Ly$\alpha$ Luminosity Function at $z\sim 6-7$ Probed by a Deep Census of $z=7.0$ Ly$\alpha$ Emitter Candidates to 0.3 $L^{\ast }$
• SILVERRUSH. VI. A simulation of Ly$\alpha$ emitters in the reionization epoch and a comparison with Subaru Hyper Suprime-Cam survey early data
• Differential Evolution of the UV Luminosity Function of Lyman Break Galaxies from z~5 to 3
• A Large Number of z > 6 Galaxies around a QSO at z = 6.43: Evidence for a Protocluster?
• The evolution of Lyman-break galaxies in CDM
• Evidence for a fast evolution of the UV luminosity function beyond redshift 6 from a deep HAWK-I survey of the GOODS-S field
• The Stellar Populations of Lyman Break Galaxies at z~5
• Spectroscopy of z~6 i-dropout Galaxies: Frequency of Ly-alpha Emission and the Sizes of Ly-alpha Emitting Galaxies
• An exponential decline at the bright end of the z=6 galaxy luminosity function
• Keck Deep Fields. III. Luminosity-dependent Evolution of the Ultraviolet Luminosity and Star Formation Rate Densities at z~4, 3, and 2
• The Cross-Correlation of High-Redshift 21 cm and Galaxy Surveys
• Evidence for strong evolution of the cosmic star formation density at high redshift
• Spectroscopy of luminous z>7 galaxy candidates and sources of contamination in z>7 galaxy searches
• Bright Strongly Lensed Galaxies at Redshift z~ 6-7 behind the Clusters Abell 1703 and CL0024+161
• Serendipitous Discovery of an Overdensity of Lyman-Alpha Emitters at z~4.8 in the Cl1604 Supercluster Field
• The discovery of a significant sample of massive galaxies at redshifts 5 < z < 6 in the UKIDSS Ultra Deep Survey Early Data Release
• A Census of Star-Forming Galaxies at z = 1-3 in the Subaru Deep Field
• The UV colours and dust attenuation of Lyman-break galaxies
• Discovery of Lyman Break Galaxies at z~7 from the ZFOURGE Survey
• Clustering of i-dropout galaxies at z=6 in GOODS and the UDF
• Observing the first galaxies
• Lyman Break Galaxies at z~5: Rest-frame UV Spectra II
• Star Formation and AGN activity in Galaxies classified using the 1.6 μm Bump and PAH features at $z=0.4-2$
• Lyman Break Galaxies at z~1.8-2.8: GALEX/NUV Imaging of the Subaru Deep Field
• No Ly$\alpha$ emitters detected around a QSO at z=6.4: Suppressed by the QSO?
• UV Continuum Spectroscopy of a 6L* z=5.5 Starburst Galaxy
• Ly alpha emissters at z=6.5 in the SSA22 field: An area more neutral or void at the end of the reionization epoch
• The UDF05 Follow-up of the Hubble Ultra Deep Field. III. The Luminosity Function at z~6
• The very wide-field $gzK$ galaxy survey -- I. Details of the clustering properties of star-forming galaxies at $z\sim 2$
• Very high-energy constraints on the Infrared Extragalactic Background Light
• Observations of the High Redshift Universe
• Identifying Lyman Alpha Emitters powered by AGNs
• The very wide-field $gzK$ galaxy survey -- II. The relationship between star-forming galaxies at $z\sim 2$ and their host haloes based upon HOD modelling
• Possible evolution of the circum-galactic medium around QSOs with QSO age and cosmic time revealed by Ly$\alpha$ halos
• Astrophysics in 2005
• A search for Ly-alpha emitters around a concentrated-region of strong Ly-alpha absorbers at z=2.3
• New High-Redshift Galaxies at $z$ = 5.8 - 6.5 in the Subaru Deep Field
• A survey of NB921 dropouts in the Subaru Deep Field