The bright end of the galaxy luminosity function at $z\simeq 7$ from the VISTA VIDEO survey

Abstract

We have conducted a search for $z\simeq 7$ Lyman break galaxies over 8.2 square degrees of near-infrared imaging from the VISTA Deep Extragalactic Observations (VIDEO) survey in the XMM-Newton - Large Scale Structure (XMM-LSS) and the Extended Chandra Deep Field South (ECDF-S) fields. Candidate galaxies were selected from a full photometric redshift analysis down to a $Y+J$ depth of 25.3 ($5\sigma$), utilizing deep auxiliary optical and Spitzer/IRAC data to remove brown dwarf and red interloper galaxy contaminants. Our final sample consists of 28 candidate galaxies at $6.5\le z\le 7.5$ with $-23.5\le M_{\mathrm{UV}}\le -21.6$. We derive stellar masses of $9.1\le {\log }_{10}(M/M_{\odot })\le 10.9$ for the sample, suggesting that these candidates represent some of the most massive galaxies known at this epoch. We measure the rest-frame UV luminosity function (LF) at $z\simeq 7$, confirming previous findings of a gradual decline in number density at the bright-end ($M_{\mathrm{UV}}<-22$) that is well described by a double-power law (DPL). We show that quasar contamination in this magnitude range is expected to be minimal, in contrast to conclusions from recent pure-parallel Hubble studies. Our results are up to a factor of ten lower than previous determinations from optical-only ground-based studies at $M_{\mathrm{UV}}\lesssim -23$. We find that the inclusion of $YJH{K}_s$ photometry is vital for removing brown-dwarf contaminants, and $z\simeq 7$ samples based on red-optical data alone could be highly contaminated ($\gtrsim 50$ per cent). In comparison with other robust $z>5$ samples, our results further support little evolution in the very bright-end of the rest-frame UV LF from $z=5-10$, potentially signalling a lack of mass quenching and/or dust obscuration in the most massive galaxies in the first Gyr.

arXiv comment15 pages, 6 figures, 5 tables (plus additional figures/tables in Appendix). Accepted for publication in MNRAS

References in corpus (69)

• Stellar population synthesis at the resolution of 2003
• Galactic Stellar and Substellar Initial Mass Function
• Gaia Data Release 2. Summary of the contents and survey properties
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Average Star Formation Histories of Galaxies in Dark Matter Halos from z=0-8
• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• Accurate photometric redshifts for the CFHT Legacy Survey calibrated using the VIMOS VLT Deep Survey
• A luminous quasar at a redshift of z = 7.085
• Simba: Cosmological Simulations with Black Hole Growth and Feedback
• An 800-million-solar-mass black hole in a significantly neutral Universe at redshift 7.5
• Measuring and Modelling the Redshift Evolution of Clustering: the Hubble Deep Field North
• What Shapes the Luminosity Function of Galaxies?
• UltraVISTA: a new ultra-deep near-infrared survey in COSMOS
• The Connection between Galaxies and their Dark Matter Halos
• Inferring the star-formation histories of massive quiescent galaxies with BAGPIPES: Evidence for multiple quenching mechanisms
• The Evolution of the Galaxy Rest-Frame Ultraviolet Luminosity Function Over the First Two Billion Years
• Spectroscopic Confirmation of a Population of Normal Star-Forming Galaxies at Redshifts z>3
• Second Data Release of the Hyper Suprime-Cam Subaru Strategic Program
• A Luminous Quasar at Redshift 7.642
• Two Remarkably Luminous Galaxy Candidates at $z\approx 10-12$ Revealed by JWST
• The evolution of the galaxy UV luminosity function at redshifts z ~ 8-15 from deep JWST and ground-based near-infrared imaging
• New Determinations of the UV Luminosity Functions from z~9 to z~2 show a remarkable consistency with halo growth and a constant star formation efficiency
• A new multi-field determination of the galaxy luminosity function at z=7-9 incorporating the 2012 Hubble Ultra Deep Field imaging
• Cosmic Variance and Its Effect on the Luminosity Function Determination in Deep High z Surveys
• Third Data Release of the Hyper Suprime-Cam Subaru Strategic Program
• The VISTA Deep Extragalactic Observations (VIDEO) Survey
• Atmospheric Parameters of Field L and T Dwarfs
• Galaxy Groups in the SDSS DR4: III. the luminosity and stellar mass functions
• Observational evidence of quasar feedback quenching star formation at high redshift
• Evidence for Ubiquitous, High-EW Nebular Emission in z~7 Galaxies: Towards a Clean Measurement of the Specific Star Formation Rate using a Sample of Bright, Magnified Galaxies
• The chemical enrichment in the early Universe as probed by JWST via direct metallicity measurements at z~8
• The Non-Parametric Model for Linking Galaxy Luminosity with Halo/Subhalo Mass
• Galaxies at z = 6 - 9 from the WFC3/IR imaging of the HUDF
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). V. Quasar Luminosity Function and Contribution to Cosmic Reionization at z = 6
• A lack of evolution in the very bright-end of the galaxy luminosity function from z = 8-10
• 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
• Reionization Era Bright Emission Line Survey: Selection and Characterization of Luminous Interstellar Medium Reservoirs in the z>6.5 Universe
• The bright end of the galaxy luminosity function at z ~ 7: before the onset of mass quenching?
• The galaxy luminosity function at z ~ 6 and evidence for rapid evolution in the bright end from z ~ 7 to 5
• The WIRCam Deep Survey I: Counts, colours and mass-functions derived from near-infrared imaging in the CFHTLS deep fields
• CARS: the CFHTLS-Archive-Research Survey; I. Five-band multi-colour data from 37 sq. deg. CFHTLS-Wide observations
• The Spitzer Extragalactic Representative Volume Survey (SERVS): survey definition and goals
• High-precision Photometric Redshifts from Spitzer/IRAC: Extreme [3.6]-[4.5] Colors Identify Galaxies in the Redshift Range z~6.6-6.9
• What Shapes the Galaxy Mass Function? Exploring the Roles of Supernova-Driven Winds and AGN
• Unveiling the nature of bright z ~ 7 galaxies with the Hubble Space Telescope
• The [OIII]$+$H$\beta$ Equivalent Width Distribution at z$\simeq$7: Implications for the Contribution of Galaxies to Reionization
• The Brightest of Reionizing Galaxies Survey: Constraints on the Bright End of the z~8 Luminosity Function
• The UV galaxy luminosity function at z=3-5 from the CFHT Legacy Survey Deep fields
• The REBELS ALMA Survey: cosmic dust temperature evolution out to z $\sim$ 7
• The ALMA REBELS Survey: Dust Continuum Detections at z > 6.5
• The Brightest $z\gtrsim 8$ Galaxies over the COSMOS UltraVISTA Field
• Star formation histories of UV-luminous galaxies at $z\simeq 6.8$: implications for stellar mass assembly at early cosmic times
• The ALMA REBELS Survey: The Dust-obscured Cosmic Star Formation Rate Density at Redshift 7
• First Light And Reionisation Epoch Simulations (FLARES) II: The Photometric Properties of High-Redshift Galaxies
• Discovery of bright z ~ 7 galaxies in the UltraVISTA survey
• Obscured star-formation in bright z ~ 7 Lyman-break galaxies
• Euclid preparation: XVIII. Cosmic Dawn Survey. Spitzer observations of the Euclid deep fields and calibration fields
• The Faint End of the Quasar Luminosity Function at $z\sim 5$ from the Subaru Hyper Suprime-Cam Survey
• A physical model for the evolving UV luminosity function of high redshift galaxies and their contribution to the cosmic reionization
• The discovery of rest-frame UV colour gradients and a diversity of dust morphologies in bright z ~ 7 Lyman-break galaxies
• Probing the Bright End of the Rest-Frame Ultraviolet Luminosity Function at z = 8-10 with Hubble Pure-Parallel Imaging
• The rest-frame UV luminosity function at $z\simeq 4$: a significant contribution of AGN to the bright-end of the galaxy population
• Hubble Space Telescope Observations of Field Ultracool Dwarfs at High Galactic Latitude
• Bridging Star-Forming Galaxy and AGN Ultraviolet Luminosity Functions at $z=4$ with the SHELA Wide-Field Survey
• A Limit on the Number Density of Bright z~7 Galaxies
• Euclid preparation. XXI. Intermediate-redshift contaminants in the search for $z>6$ galaxies within the Euclid Deep Survey
• The Effect of Atmospheric Cooling on the Vertical Velocity Dispersion and Density Distribution of Brown Dwarfs
• Evaluation of the Vertical Scale Height of L dwarfs in the Galactic Thin Disk

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