Stellar Masses of Lyman Break Galaxies, Lyman Alpha Emitters and Radio Galaxies in Overdense Regions at z=4-6

Abstract

We present new information on galaxies in the vicinity of luminous radio galaxies and quasars at z=4,5,6. These fields were previously found to contain overdensities of Lyman Break Galaxies (LBGs) or spectroscopic Lyman alpha emitters. We use HST and Spitzer data to infer stellar masses, and contrast our results with large samples of LBGs in more average environments as probed by the Great Observatories Origins Deep Survey (GOODS). The following results were obtained. First, LBGs in both overdense regions and in the field at z=4-5 lie on a very similar sequence in a z'-[3.6] versus [3.6] color-magnitude diagram. This is interpreted as a sequence in stellar mass (log[M*/Msun] = 9-11) in which galaxies become increasingly red due to dust and age as their star formation rate (SFR) increases. Second, the two radio galaxies are among the most massive objects (log[M*/Msun]~11) known to exist at z~4-5, and are extremely rare based on the low number density of such objects as estimated from the ~25x larger area GOODS survey. We suggest that the presence of these massive galaxies and supermassive black holes has been boosted through rapid accretion of gas or merging inside overdense regions. Third, the total stellar mass found in the z=4 ``proto-cluster'' TN1338 accounts for <30% of the stellar mass on the cluster red sequence expected to have formed at z>4, based on a comparison with the massive X-ray cluster Cl1252 at z=1.2. Although future near-infrared observations should determine whether any massive galaxies are currently being missed, one possible explanation for this mass difference is that TN1338 evolves into a smaller cluster than Cl1252. This raises the interesting question of whether the most massive protocluster regions at z>4 remain yet to be discovered.

The Astrophysical Journal, In Press (17 pages, 7 figures)

References in corpus (30)

• The hierarchical formation of the brightest cluster galaxies
• The Hubble Ultra Deep Field
• 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
• Evidence for TP-AGB stars in high redshift galaxies, and their effect on deriving stellar population parameters
• What do we learn from IRAC observations of galaxies at 2 < z < 3.5?
• Gemini Near-infrared Spectroscopy of Luminous z~6 Quasars: Chemical Abundances, Black Hole Masses, and MgII Absorption
• The Massive Hosts of Radio Galaxies Across Cosmic Time
• Black hole masses and enrichment of z ~ 6 SDSS quasars
• The First Appearance of the Red Sequence of Galaxies in Proto-Clusters at 2<~z<~3
• The luminosity function, halo masses and stellar masses of luminous Lyman-break galaxies at redshifts 5<z<6
• Spectroscopic Confirmation Of An Extreme Starburst At Redshift 4.547
• Clusters at Half Hubble Time: Galaxy Structure and Colors in RXJ0152.7-1357 and MS1054-03
• The Stellar Mass Density at z~6 from Spitzer Imaging of i-drop Galaxies
• A Population of Massive and Evolved Galaxies at z$\ga$5
• Lyman-break galaxies at z~5 -I. First significant stellar mass assembly in galaxies that are not simply z~3 LBGs at higher redshift
• LCDM predictions for galaxy protoclusters I: the relation between galaxies, protoclusters and quasars at z~6
• Systematic Uncertainties in Stellar Mass Estimation for Distinct Galaxy Populations
• The physical properties of Lyalpha emitting galaxies: not just primeval galaxies?
• A systematic search for very massive galaxies at z > 4
• Physical properties of z~4 LBGs: differences between galaxies with and without Ly-alpha emission
• The Nascent Red Sequence at z~2
• Comparing dynamical and photometric-stellar masses of early-type galaxies at z ~ 1
• The growth and assembly of a massive galaxy at z ~ 2
• Physical interpretation of the near-infrared colours of low redshift galaxies
• The discovery of a significant sample of massive galaxies at redshifts 5 < z < 6 in the UKIDSS Ultra Deep Survey Early Data Release
• The VLA Survey of the Chandra Deep Field South. II. Identification and host galaxy properties of submillijansky sources
• Morphologies of Galaxies in and around a Protocluster at z=2.300
• The Density and Spectral Energy Distributions of Red Galaxies at z~3.7
• Large-scale structure of Lyman break galaxies around a radio galaxy protocluster at z~4

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• The realm of the galaxy protoclusters
• A massive proto-cluster of galaxies at a redshift of z {\approx} 5.3
• The [C II] emission as a molecular gas mass tracer in galaxies at low and high redshift
• On the Stellar Populations and Evolution of Star-Forming Galaxies at 6.3 < z < 8.6
• Smoothly-Rising Star Formation Histories During the Reionization Epoch
• GOLDRUSH. III. A Systematic Search of Protoclusters at $z\sim 4$ Based on the $>100\mathrm{de}{\mathrm{g}}^2$ Area
• The HETDEX Pilot Survey III: The Low Metallicities of High-Redshift Lyman Alpha Galaxies
• A Systematic Survey of Protoclusters at $z\sim 3-6$ in the CFHTLS Deep Fields
• Discovery of a protocluster at z~6
• VIMOS Ultra-Deep Survey (VUDS): Witnessing the Assembly of a Massive Cluster at z~3.3
• The Emission-Line Spectra of Major Mergers: Evidence for Shocked Outflows
• Young Galaxy Candidates in the Hubble Frontier Fields. I. Abell 2744
• Discovery of a radio galaxy at z = 5.72
• A First Site of Galaxy Cluster Formation: Complete Spectroscopy of a Protocluster at $z=6.01$
• Early-Type galaxies at z ~ 1.3. III. On the dependence of Formation Epochs and Star Formation Histories on Stellar Mass and Environment
• Discovery of Lyman Break Galaxies at z~7 from the ZFOURGE Survey
• Assembly of Massive Galaxies in a High-z Protocluster
• Young Galaxy Candidates in the Hubble Frontier Fields IV. MACS J1149.5+2223
• Ultra-Red Galaxies Signpost Candidate Proto-Clusters at High Redshift
• Overdensities of Submillimetre-Bright Sources around Candidate Protocluster Cores Selected from the South Pole Telescope Survey
• Candidate Clusters of Galaxies at $z>1.3$ Identified in the Spitzer SPT Deep Field Survey
• Implications of the Environments of Radio-detected AGN in a Complex Protostructure at z$\sim$3.3
• The relative growth of Optical and Radio Quasars in SDSS
• A census of optically dark massive galaxies in the early Universe from magnification by lensing galaxy clusters
• JWST's PEARLS: TN J1338-1942 -- I. Extreme jet triggered star-formation in a $z=4.11$ luminous radio galaxy
• Protocluster detection in simulations of HSC-SSP and the 10-year LSST forecast, using PCcones
• A compact symmetric radio source born at one-tenth the current age of the Universe
• Conditions for direct black hole seed collapse near a radio-loud quasar 1 Gyr after the Big Bang
• GTC Observations of an Overdense Region of LAEs at z=6.5
• X-ray emission around the z=4.1 radio galaxy TNJ1338-1942 and the potential role of far-infrared photons in AGN Feedback
• A galaxy populations study of a radio-selected protocluster at z~3.1
• A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). IX. The Most Overdense Region at z~5 Inhabited by a Massive Radio Galaxy
• Optical detection of a GMRT-detected candidate high-redshift radio galaxy with 3.6-m Devasthal optical telescope
• 3C 294 revisited: Deep Large Binocular Telescope AO NIR images and optical spectroscopy