The galaxy UV luminosity function at z ~ 2 - 4; new results on faint-end slope and the evolution of luminosity density

Abstract

We present a new, robust measurement of the evolving rest-frame UV galaxy luminosity function (LF) over the key redshift range z = 2 - 4. Our results are based on the high dynamic range provided by combining the HUDF, CANDELS/GOODS-South, and UltraVISTA/COSMOS surveys. We utilise the unparalleled multi-frequency photometry available in this survey `wedding cake' to compile complete galaxy samples at z ~ 2,3,4 via photometric redshifts (calibrated against the latest spectroscopy) rather than colour-colour selection, and to determine accurate rest-frame UV absolute magnitudes from SED fitting. Our new determinations of the UV LF extend from M_{1500} ~ -22 down to M_{1500} = -14.5, -15.5 and -16 at z ~ 2, 3 and 4 respectively (thus reaching ~ 3 - 4 magnitudes fainter than previous blank-field studies at z ~ 2 - 3). At z ~ 2 - 3 we find a much shallower faint-end slope (alpha = -1.32 +- 0.03) than the steeper values (alpha ~ -1.7) reported by Reddy & Steidel (2009) or by Alavi et al. (2014), and show that this new measurement is robust. By z ~ 4 the faint-end slope has steepened slightly, to alpha = -1.43 +- 0.04, and we show that these measurements are consistent with the overall evolutionary trend from z = 0 to z = 8. Finally, we find that while characteristic number density (phi*) drops from z ~ 2 to z ~ 4, characteristic luminosity (M*) brightens by ~ 1 mag over this redshift range. This, combined with the new flatter faint-end slopes, has the consequence that UV luminosity density (and hence unobscured star-formation density) peaks at z ~ 2.5 - 3, when the Universe was ~ 2.5 Gyr old.

18 pages, 16 figures, updated to match version now published in MNRAS

References in corpus (25)

• Cosmic Star Formation History
• The Cosmic Evolution Survey (COSMOS) -- Overview
• EAZY: A Fast, Public Photometric Redshift Code
• New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
• UV Luminosity Functions at redshifts z~4 to z~10: 10000 Galaxies from HST Legacy Fields
• zCOSMOS: A Large VLT/VIMOS redshift survey covering 0 < z < 3 in the COSMOS field
• 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
• The Hubble Ultra Deep Field
• UltraVISTA: a new ultra-deep near-infrared survey in COSMOS
• UVUDF: Ultraviolet Through Near-infrared Catalog and Photometric Redshifts of Galaxies in the Hubble Ultra Deep Field
• Deep U band and R imaging of GOODS-South: Observations,data reduction and first results
• Hubble Frontier Fields First Complete Cluster Data: Faint Galaxies at $z\sim 5-10$ for UV Luminosity Functions and Cosmic Reionization
• New redshift z ~ 9 galaxies in the Hubble Frontier Fields: Implications for early evolution of the UV luminosity density
• A Simple Technique for Predicting High-Redshift Galaxy Evolution
• New Constraints on the Faint-end of the UV Luminosity Function at z~7-8 using the Gravitational Lensing of the Hubble Frontier Fields Cluster A2744
• The luminosity function, halo masses and stellar masses of luminous Lyman-break galaxies at redshifts 5<z<6
• T-PHOT: A new code for PSF-matched, prior-based, multiwavelength extragalactic deconfusion photometry
• The Hawk-I UDS and GOODS Survey (HUGS): Survey design and deep K-band number counts
• The Luminosity Function at z~8 from 97 Y-band dropouts: Inferences About Reionization
• Evolution of the H$\beta$+[OIII] and [OII] luminosity functions and the [OII] star-formation history of the Universe up to $z$ ~ 5 from HiZELS
• The UDF05 Follow-up of the HUDF: I. The Faint-End Slope of the Lyman-Break Galaxy Population at z~5
• Differential Evolution of the UV Luminosity Function of Lyman Break Galaxies from z~5 to 3
• A WFC3 Grism Emission Line Redshift Catalog in the GOODS-South Field
• The Very Faint End of the UV Luminosity Function over Cosmic Time: Constraints from the Local Group Fossil Record
• Deep GMOS Spectroscopy of Extremely Red Galaxies in GOODS-South: Ellipticals, Mergers and Red Spirals at 1<z<2

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