The Galaxy Luminosity Function at z~1 in the HUDF: Probing the Dwarf Population

Abstract

We present a catalog of spectro-photometric redshifts for 1308 galaxies from the GRism ACS Program for Extragalactic Science (GRAPES) observations with the Hubble Space Telescope. These low-resolution spectra between 6000 A and 9500 A are supplemented with U, J, H, and Ks from various facilities, resulting in redshifts computed with ~40 spectral bins per galaxy. For 81 galaxies between 0.5<z<1.5 with spectroscopic redshifts, the standard deviation in the fractional error in (1+z) is 0.046. With this catalog, we compute the B-band luminosity function in this redshift range from 72 galaxies. Owing to the depth of the GRAPES survey, we are able to accurately constrain the faint-end slope by going to M_B~-18 mag at 0.8<z<1.2, nearly two magnitudes fainter than previous studies. The faint-end slope is alpha=-1.32+-0.07. When compared to numerous published values at various redshifts, we find strong evidence for a steepening of the faint-end slope with redshift which is expected in the hierarchical formation scenario of galaxies.

Includes emulateapj.cls, 6 pages, 6 figures (1 color), 3 tables. Accepted for publication to ApJ

References in corpus (10)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• The Hubble Ultra Deep Field
• Galaxies in the Hubble Ultra Deep Field: I. Detection, Multiband Photometry, Photometric Redshifts, and Morphology
• Galaxies at z~6: The UV Luminosity Function and Luminosity Density from 506 UDF, UDF-Ps, and GOODS i-dropouts
• The GOODS-MUSIC sample: a multicolour catalog of near-IR selected galaxies in the GOODS-South field
• The Great Observatories Origins Deep Survey VLT/FORS2 Spectroscopy in the GOODS-South Field: Part II
• Photometric Redshifts of Galaxies in COSMOS
• 531 new spectroscopic redshifts from the CDFS and a test on the cosmological relevance of the GOODS-South field
• The rest-frame optical luminosity functions of galaxies at 2<z<3.5
• Redshifts of Emission Line Objects in the Hubble Ultra Deep Field

Cited by in corpus (38)

• A Steep Faint-End Slope of the UV Luminosity Function at z~2-3: Implications for the Global Stellar Mass Density and Star Formation in Low Mass Halos
• A Photometric Redshift of z ~ 9.4 for GRB 090429B
• The Star Formation Rate Density and Dust Attenuation Evolution over 12 Gyr with the VVDS Surveys
• The Hubble Space Telescope Wide Field Camera 3 Early Release Science data: Panchromatic Faint Object Counts for 0.2-2 microns wavelength
• The Evolution of Stellar Mass and the Implied Star Formation History
• UVUDF: Ultraviolet Through Near-infrared Catalog and Photometric Redshifts of Galaxies in the Hubble Ultra Deep Field
• Globular Cluster Systems in Nearby Dwarf Galaxies: III. Formation Efficiencies of Old Globular Clusters
• An Unexpectedly Swift Rise in the Gamma-ray Burst Rate
• HST morphologies of local Lyman break galaxy analogs I: Evidence for starbursts triggered by merging
• MOIRCS Deep Survey IV: Evolution of Galaxy Stellar Mass Function Back to z ~ 3
• Globular Cluster Systems in Nearby Dwarf Galaxies: I. HST/ACS Observations and Dynamical Properties of Globular Clusters at Low Environmental Density
• The UDF05 Follow-up of the HUDF: I. The Faint-End Slope of the Lyman-Break Galaxy Population at z~5
• Lyman alpha emitting galaxies at 0.2 < z < 0.35 from GALEX spectroscopy
• Pre-Merger Localization of Gravitational-Wave Standard Sirens With LISA: Triggered Search for an Electromagnetic Counterpart
• The UDF05 Follow-up of the HUDF: II. Constraints on Reionization from z-dropout Galaxies
• UV-dropout Galaxies in the GOODS-South Field from WFC3 Early Release Science Observations
• Galaxy Mergers at z>1 in the HUDF: Evidence for a Peak in the Major Merger Rate of Massive Galaxies
• Filamentary Infall of Cold Gas and Escape of Lyman Alpha and Hydrogen Ionizing Radiation from an Interacting High-Redshift Galaxy
• A CANDELS WFC3 Grism Study of Emission-Line Galaxies at z~2: A Mix of Nuclear Activity and Low-Metallicity Star Formation
• Old globular clusters in magellanic-type dwarf irregular galaxies
• FIGS -- Faint Infrared Grism Survey: Description and Data Reduction
• Global Star Formation Rate Density over 0.7<z<1.9
• Emission-Line Galaxies from the HST PEARS Grism Survey I: The South Fields
• The Evolution of the Rest-frame V-band Luminosity Function from z=4: A Constant Faint-end Slope over the Last 12 Gyr of Cosmic History
• Emission-Line Galaxies from the PEARS Hubble Ultra Deep Field: A 2-D Detection Method and First Results
• Stellar Populations of Late-Type Bulges at z=1 in the HUDF
• The Luminosity Function of the NoSOCS Galaxy Cluster Sample
• Evolution of Galaxy Luminosity Function Using Photometric Redshifts
• The Contribution of Supernovae to Cosmic Reionization
• The AstroSat UV Deep Field North: the far and near ultraviolet photometric catalog
• A Catalog of Emission-Line Galaxies from the Faint Infrared Grism Survey: Studying Environmental Influence on Star Formation
• Improved Photometric Redshifts with Surface Luminosity Priors
• Spectrophotometric Redshifts In The Faint Infrared Grism Survey: Finding Overdensities Of Faint Galaxies
• Spectrophotometric redshifts for $\mathrm{z}\sim 1$ galaxies and predictions for number densities with WFIRST and Euclid
• Simulating continuum-based redshift measurement in the \textit{Roman's} High Latitude Spectroscopy Survey
• Is the Optically Unidentified Radio Source, FIRST J121839.7+295325, a Dark Lens?
• Modeling the High-z Universe: Probing Galaxy Formation
• The 5 Gyr evolution of sub-M* galaxies