Constraints to the evolution of Ly-α bright galaxies between z = 3 and z = 6

Galaxies at high redshift with a strong Ly-α emission line trace massive star formation in the absence of dust, and can therefore be regarded as a prime signature of the first major starburst in galaxies. We report results of the Ly-α search within the Calar Alto Deep Imaging Survey (CADIS). With the imaging Fabry-Perot interferometer, CADIS can detect emission lines in three waveband windows free of night-sky emission lines at 700 nm, 820 nm, and 920 nm. The typical flux detection limit for Ly-α emission redshifted into these windows, Flim > 3 × 10 −20 Wm −2 , corresponds to (unobscured) star formation rates of >10 M� /yr at z = 6. Candidate Ly-α-emitting galaxies are selected from the total emission line sample, which contains more than 97% of objects at z 5 than the assumption of a non-evolving population would predict. Therefore we conclude that the Ly-α bright phase of primeval star formation episodes reached its peak at redshifts 3 < z < 6.

[1]  Oxford,et al.  Star forming rates between z = 0.25 and z = 1.2 from the CADIS emission line survey , 2003, astro-ph/0302116.

[2]  Arjun Dey,et al.  Spectroscopic Confirmation of Three Redshift z ≈ 5.7 Lyα Emitters from the Large-Area Lyman Alpha Survey , 2002, astro-ph/0209544.

[3]  V. Narayanan,et al.  VLT Optical and Near-Infrared Observations of the z = 6.28 Quasar SDSS J1030+0524 , 2002 .

[4]  H. Spinrad,et al.  A Galactic Wind at z=5.190 , 2002, astro-ph/0201194.

[5]  V. Narayanan,et al.  VLT observations of the z=6.28 quasar SDSS 1030+0524 , 2001, astro-ph/0112075.

[6]  V. Narayanan,et al.  Evolution of the Ionizing Background and the Epoch of Reionization from the Spectra of z ∼ 6 Quasars , 2001, astro-ph/0111184.

[7]  V. Narayanan,et al.  A Survey of z > 5.8 Quasars in the Sloan Digital Sky Survey. I. Discovery of Three New Quasars and the Spatial Density of Luminous Quasars at z ∼ 6 , 2001, astro-ph/0108063.

[8]  R. Kawabe,et al.  VLBI Study of Water Maser Emission in the Seyfert 2 Galaxy NGC 5793. I. Imaging Blueshifted Emission and the Parsec-Scale Jet , 2001, astro-ph/0107088.

[9]  H. Ford,et al.  Discovery of Nine Lyα Emitters at Redshift z ~ 3.1 Using Narrowband Imaging and VLT Spectroscopy , 2000, astro-ph/0001156.

[10]  H. Spinrad,et al.  First Results from the Large-Area Lyman Alpha Survey , 1999, astro-ph/0003465.

[11]  Cambridge,et al.  ∼ 4 and the Evolution of the Uv Luminosity Density at High Redshift , 2022 .

[12]  Z. Haiman,et al.  Models for Dusty Lyα Emitters at High Redshift , 1998, astro-ph/9809223.

[13]  L. Cowie,et al.  High-z Lyα Emitters. I. A Blank-Field Search for Objects near Redshift z = 3.4 in and around the Hubble Deep Field and the Hawaii Deep Field SSA 22 , 1998, astro-ph/9801003.

[14]  C. Breuck,et al.  YOUNG UNIVERSE: GALAXY FORMATION AND EVOLUTION AT INTERMEDIATE AND HIGH REDSHIFT , 1998 .

[15]  U. Hopp,et al.  The Calar Alto Deep Imaging Survey , 1998 .

[16]  M. Giavalisco,et al.  A Large Structure of Galaxies at Redshift z ~ 3 and Its Cosmological Implications , 1997, astro-ph/9708125.

[17]  M. Giavalisco,et al.  Spectroscopic Confirmation of a Population of Normal Star-forming Galaxies at Redshifts z > 3 , 1996, astro-ph/9602024.

[18]  K. Meisenheimer,et al.  Number density predictions for primeval galaxies , 1996 .

[19]  Henry C. Ferguson,et al.  The Lyman Continuum in Starburst Galaxies Observed with the Hopkins Ultraviolet Telescope , 1995 .

[20]  C. Leitherer,et al.  Atlas of Synthetic Ultraviolet Spectra of Massive Star Populations , 1995 .

[21]  Piero Madau,et al.  Radiative transfer in a clumpy universe: The colors of high-redshift galaxies , 1995 .

[22]  H. Hippelein,et al.  Galaxies in the Young Universe , 1995 .

[23]  S. M. Fall,et al.  Lyman-Alpha Emission from Galaxies , 1993 .

[24]  Donald Hamilton,et al.  Deep imaging of high redshift QSO fields below the Lyman limit. II - Number counts and colors of field galaxies , 1993 .

[25]  Donald Hamilton,et al.  Deep imaging of high redshift QSO fields below the Lyman limit. I - The field of Q0000-263 and galaxies at Z = 3.4 , 1992 .

[26]  Nicholas B. Suntzeff,et al.  SOUTHERN SPECTROPHOTOMETRIC STANDARDS. I. , 1992 .

[27]  R. Kennicutt.  The Rate of star formation in normal disk galaxies , 1983 .

[28]  M. Brocklehurst,et al.  Calculations of Level Populations for the Low Levels of Hydrogenic Ions in Gaseous Nebulae , 1971 .