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Four recent observational results have challenged our understanding of high--redshift galaxies, as they require the presence of far more ultraviolet photons than should be emitted by normal stellar populations. First, there is significant…

Astrophysics · Physics 2009-11-11 Raul Jimenez , Zoltan Haiman

Using deep near-IR and optical observations of the HDF-N from the HST NICMOS and WFPC2 and from the ground, we examine the spectral energy distributions (SEDs) of Lyman break galaxies (LBGs) at 2.0 < z < 3.5. The UV-to-optical rest-frame…

Astrophysics · Physics 2008-11-26 Casey Papovich , Mark Dickinson , Henry C. Ferguson

Star-forming galaxies at redshifts z>6 are likely responsible for the reionization of the universe, and it is important to study the nature of these galaxies. We present three candidates for z~7 Lyman-break galaxies (LBGs) from a 155…

We predict the formation histories, properties and descendants of Lyman-break galaxies (LBGs) in the Lambda-CDM cosmology. In our model, which incorporates a top-heavy IMF in starbursts, we find that most LBGs are starbursts triggered by…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-28 Juan E. Gonzalez , C. G. Lacey , C. M. Baugh , C. S. Frenk , A. J. Benson

We have obtained the first constraints on extended Ly-alpha emission at z ~ 1 in a sample of five radio galaxies. We detect Ly-alpha emission from four of the five galaxies. The Ly-alpha luminosities range from 0.1 - 4 times 10^43 erg/s and…

Cosmology and Nongalactic Astrophysics · Physics 2011-02-11 Andrew W. Zirm , Arjun Dey , Mark Dickinson , Colin J. Norman

The existence of massive ($10^{11}$ solar masses) elliptical galaxies by redshift z~4 (when the Universe was 1.5 billion years old) necessitates the presence of galaxies with star-formation rates exceeding 100 solar masses per year at z>6…

We have shown previously that galaxy counts from the UV to the near-IR are well-fitted by simple evolutionary models where the space density of galaxies remains constant with look-back time while the star-formation rate rises exponentially.…

Astrophysics · Physics 2007-05-23 T. Shanks , N. Metcalfe , R. Fong , H. J. McCracken , A. Campos , D. Thompson

The advent of 8m-class telescopes has made galaxies at 1 < z < 4 relatively easy to detect and study. This is a brief and incomplete review of some of the recent results to emerge from surveys at these redshifts. After describing different…

Astrophysics · Physics 2007-05-23 K. L. Adelberger

I review recent observations on the evolution of quasars, describe new surveys for quasars at z > 5 and for quasars at z > 3.3 down to luminosities corresponding to L* galaxies, and note the possible connection between the evolution of the…

Astrophysics · Physics 2007-05-23 Patrick S. Osmer

We utilize deep near-infrared survey data from the UltraVISTA fourth data release (DR4) and the VIDEO survey, in combination with overlapping optical and Spitzer data, to search for bright star-forming galaxies at $z \gtrsim 7.5$. Using a…

The number density and clustering properties of Lyman-break galaxies (LBGs) observed at redshift $z\sim 3$ are best explained by assuming that they are associated with the most massive haloes at $z\sim 3$ predicted in hierarchical models of…

Astrophysics · Physics 2007-05-23 Chenggang Shu

(ABRIDGED) We present the global results of a large spectroscopic survey carried out in order to identify z~ 5 Lyman break galaxies (LBGs) across ten widely-separated fields to I_{AB}=26.3. The redshifts of seventy 4.6<z<5.6 LBGs were…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 L. S. Douglas , M. N. Bremer , M. D. Lehnert , E. R. Stanway , Bo Milvang-Jensen

We use very deep UGRI multi-field imaging obtained at the Keck telescope to study the evolution of the rest-frame 1700A galaxy luminosity function as the Universe doubles its age from z~4 to z~2. The depth of our imaging allows us to…

Astrophysics · Physics 2009-11-13 Marcin Sawicki , David Thompson

We study the properties of very faint, sub-L* Lyman break galaxies at z~2-5 - thus far a largely neglected but numerically and energetically very important population. We find that the LBG luminosity function undergoes luminosity-dependent…

We use hydrodynamic cosmological simulations to predict the star formation properties of high-redshift galaxies (z=2-6) in five variants of the inflationary cold dark matter scenario, paying particular attention to z=3, the redshift of the…

Astrophysics · Physics 2009-10-31 David H. Weinberg , Lars Hernquist , Neal Katz

We present a semi-analytical model of star formation which explains simultaneously the observed UV luminosity function of high redshift Lyman break galaxies (LBGs) and luminosity functions of Lyman-alpha emitters. We consider both models…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 Saumyadip Samui , Raghunathan Srianand , Kandaswamy Subramanian

{Abridged} We report the discovery of six compact, starburst galaxy candidates with redshifts 2.3 < z < 2.8 and r-band magnitudes 19.8-20.5 in the Quasar Catalog of the Sloan Digital Sky Survey First Data Release (SDSS DR1). The SDSS…

Astrophysics · Physics 2009-11-10 Misty C. Bentz , Patrick S. Osmer , David H. Weinberg

Observational evidence has been mounting over the past decade that at least some luminous (~2 L*) galaxies have formed nearly all of their stars within a short period of time only 1-2x10^9 years after the Big Bang. These are examples of the…

Astrophysics · Physics 2010-11-11 Elizabeth J. McGrath , Alan Stockton , Gabriela Canalizo

We make a detailed investigation of the properties of Lyman-break galaxies (LBGs) in the LambdaCDM model. We present predictions for two published variants of the GALFORM semi-analytical model: the Baugh et al. (2005) model, which has star…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-18 C. G. Lacey , C. M. Baugh , C. S. Frenk , A. J. Benson , .

A model for gas outflows is proposed which simultaneously explains the correlations between the (i) equivalent width of low ionization and Ly-alpha lines, (ii) outflow velocity, and (iii) star formation rate observed in Lyman Break Galaxies…

Astrophysics · Physics 2009-11-11 A. Ferrara , M. Ricotti