J/MNRAS/476/4725 SC4K catalogue of candidate LAEs (Sobral+, 2018) ================================================================================ Slicing COSMOS with SC4K: the evolution of typical Ly{alpha} emitters and the Ly{alpha} escape fraction from z ~ 2 to 6. Sobral D., Santos S., Matthee J., Paulino-Afonso A., Ribeiro B., Calhau J., Khostovan A.A. =2018MNRAS.476.4725S (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Galaxy catalogs ; Ultraviolet ; Redshifts ; Photometry ; Equivalent widths Keywords: galaxies: evolution - galaxies: formation - galaxies: high-redshift - galaxies: luminosity function, mass function - galaxies: statistics Abstract: We present and explore deep narrow- and medium-band data obtained with the Subaru and the Isaac Newton Telescopes in the ~2deg^2^ COSMOS field. We use these data as an extremely wide, low-resolution (R~20-80) Integral Field Unit survey to slice through the COSMOS field and obtain a large sample of ~4000 Ly{alpha} emitters (LAEs) from z~2 to 6 in 16 redshift slices (SC4K). We present new Ly {alpha} luminosity functions (LFs) covering a comoving volume of ~10^8^Mpc^3^. SC4K extensively complements ultradeep surveys, jointly covering over 4dex in Ly{alpha} luminosity and revealing a global (2.53.5, likely linked with the evolution of the AGN population. The Ly {alpha} luminosity density rises by a factor ~2 from z~2 to 3 but is then found to be roughly constant (1.1^+0.2^_-0.2_x10^40^erg/s/Mpc^3^) to z~6, despite the ~0.7 dex drop in ultraviolet (UV) luminosity density. The Ly{alpha}/UV luminosity density ratio rises from 4+/-1 per cent to 30+/-6 per cent from z~2.2 to 6. Our results imply a rise of a factor of ~=2 in the global ionization efficiency ({xi}_ion_) and a factor ~=4+/-1 in the Ly{alpha} escape fraction from z~2 to 6, hinting for evolution in both the typical burstiness/stellar populations and even more so in the typical interstellar medium conditions allowing Ly{alpha} photons to escape. Description: The COSMOS field (Scoville et al., 2007ApJS..172....1S; Capak et al., 2007ApJS..172...99C, Cat. II/284) is one of the most widely studied regions of extragalactic sky, with a plethora of publicly available multiwavelength coverage. Data in COSMOS include X-ray, UV, optical, NIR, far-IR, and radio (see e.g. Ilbert et al., 2009, Cat. J/ApJ/690/1236; Civano et al., 2016, Cat. J/ApJ/819/62; Laigle et al., 2016, Cat. J/ApJS/224/24; Smolcic et al., 2017A&A...602A...6S). We explore a range of NB and MB data (Capak et al., 2007ApJS..172...99C, Cat. II/284; Taniguchi et al., 2007ApJS..172....9T, 2015PASJ...67..104T; Santos et al., 2016MNRAS.463.1678S; Sobral et al., 2017, Cat. J/MNRAS/466/1242; Matthee et al., 2017, Cat. J/MNRAS/471/629) over roughly the full COSMOS field in order to (1) create detection catalogues for each band, (2) identify sources with strong excess emission in those bands relative to their broad-band (BB) counterparts, and (3) obtain dual-mode photometry on all other bands available in order to further constrain the (photometric) redshift of each source. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file tablea1.dat 178 3908 Our full SC4K catalogue of candidate LAEs which we release with this paper tablec1.dat 167 158 The global Ly{alpha} luminosity function and for each of the medium0band filters in SC4K/this study tablec2.dat 95 171 A compilation of Ly{alpha} luminosity functions used or compared with in this study -------------------------------------------------------------------------------- See also: II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007) J/ApJ/690/1236 : COSMOS photometric redshift catalog (Ilbert+, 2009) J/ApJ/819/62 : The COSMOS-Legacy Survey (CLS) catalog (Civano+, 2016) J/ApJS/224/24 : The COSMOS2015 catalog (Laigle+, 2016) J/MNRAS/471/629 : Bootes-HiZELS. Em-line galaxies at z=0.4-4.7 (Matthee+, 2017) Byte-by-byte Description of file: tablea1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 18 A18 --- SC4K SC4K designation, SC4K-AAAAA-NNNNN (ID_SC4K) 20- 28 F9.5 deg RAdeg Right ascension (J2000) (RA) 30- 36 F7.5 deg DEdeg Declination (J2000) (DEC) 38- 42 A5 --- Band Observed band (1) 44- 50 F7.4 mag MBmag Medium-band or narrow-band magnitude (AB) (MB_mag) 52- 57 F6.4 mag e_MBmag Medium-band or narrow-band magnitude error (MB_mag_err) 59- 65 F7.4 mag BBmag Broad-band magnitude (AB) (BB_mag) 67- 73 F7.4 mag e_BBmag Broad-band magnitude error (BB_mag_err) 75- 86 E12.6 mW/m2 Flux Flux (Flux) 88- 99 E12.6 mW/m2 E_Flux Error on Flux (upper value) (Flux_err_up) 101-112 E12.6 mW/m2 e_Flux Error on Flux (lower value) (Flux_err_down) 114-125 F12.5 0.1nm EW0 Equivalent width (EW_0) 127-137 F11.5 0.1nm E_EW0 Error on EW0 (upper value) (EW_0_err_up) 139-149 F11.5 0.1nm e_EW0 Error on EW0 (lower value) (EW_0_err_down) 151-157 F7.4 10-7W LyaLum Lyman{alpha} luminosity (Lya_Lum) 159-164 F6.4 10-7W E_LyaLum Error on LyaLum (upper value) (Lya_lum_err_up) 166-172 F7.4 10-7W e_LyaLum Error on LyaLum (lower value) (Lya_lum_err_down) 174 I1 --- Cosmos [0/1] C-COSMOS legagy coverage? (C_COSMOS_LEGACY_COVERAGE) 176 I1 --- XrayDet [0/1] X-ray detected? (XRAY_DET) 178 I1 --- RadioDet [0/1] Radio detected? (RADIO_DETECTED) -------------------------------------------------------------------------------- Note (1): Bands as follows: IA427 = 4263.5+/-207.3{AA} IA464 = 4635.1+/-218.1{AA} IA484 = 4849.2+/-229.1{AA} IA505 = 5062.1+/-231.5{AA} IA527 = 5261.1+/-242.7{AA} IA574 = 5764.8+/-272.8{AA} IA624 = 6232.9+/-299.9{AA} IA679 = 6781.1+/-335.9{AA} IA709 = 7073.6+/-316.3{AA} IA738 = 7361.5+/-323.8{AA} IA767 = 7684.9+/-365.0{AA} IA827 = 8244.5+/-342.8{AA} NB392 = 3920+/-52{AA} NB501 = 5010+/-100{AA} NB711 = 7120.04{AA} NB816 = 8149.62{AA} -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablec1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 16 A16 --- Sample Sample (Sample) 18- 22 F5.2 [10-7W] logLumbin Lyman{alpha} luminosity (log_Lum_bin) 24- 27 F4.2 [10-7W] e_logLumbin Lyman{alpha} luminosity error (delta_bin) 29- 31 I3 ct Counts Observed number of source (Counts) 33- 40 F8.5 ct e_Counts rms uncertainty on Counts (Counts_err) 42- 49 F8.5 Mpc-3 Phiobs Observed number density (Phi_obs) 51- 59 F9.7 Mpc-3 E_Phiobs Error on Phiobs (upper value) (Phi_obs_err_up) 61- 69 F9.7 Mpc-3 e_Phiobs Error on Phiobs (lower value) (Phi_obs_err_down) 71- 79 F9.7 Mpc-3 E_Phiobspert Observed+perturbed number density (Phi_obs_pert_err_up) 81- 89 F9.7 Mpc-3 e_Phiobspert Error+perturbed on Phiobspert (upper value) (Phi_obs_pert_err_down) 91- 98 F8.5 Mpc-3 Phiobscomp Completeness corrected number density (Phi_obs_comp) 100-108 F9.7 Mpc-3 E_Phiobscomp Error on Phiobscomp (upper value) (Phi_obs_comp_err_up) 110-118 F9.7 Mpc-3 e_Phiobscomp Error on Phiobscomp (lower value) (Phi_obs_comp_err_down) 120-127 F8.5 Mpc-3 Phifinal Final number density(Phi_final) 129-137 F9.7 Mpc-3 E_Phi Error on Phi (upper value) (Phi_err_up) 139-147 F9.7 Mpc-3 e_Phi Error on Phi (lower value) (Phi_err_down) 149-157 F9.7 Mpc-3 E_Phifinal Error on Phifinal (upper value) (Phi_final_err_up) 159-167 F9.7 Mpc-3 e_Phifinal Error on Phifinal (lower value) (Phi_final_err_down) -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablec2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 F4.1 --- StudyN Study number (STUDY_N) 6- 27 A22 --- Ref References to the original paper (Reference) (1) 29- 47 A19 --- Comm Comments paper (Comments_PAPER) 49- 52 F4.2 --- zmin Minimum redshift (z_min) 54- 57 F4.2 --- zmax Maximum redshift (z_max) 59- 64 F6.3 [10-7W] logL Lyman{alpha} luminosity (LogL) 66- 70 F5.3 [10-7W] e_logL Lyman{alpha} luminosity error (D_LogL) 72- 79 F8.5 [Mpc-3] logPhi Number density (LogPhi) 81- 87 F7.5 [Mpc-3] E_logPhi Error on logPhi (upper value) (D_LogPhi_up) 89- 95 F7.5 [Mpc-3] e_logPhi Error on logPhi (lower value) (D_LogPhi_down) -------------------------------------------------------------------------------- Note (1): References as follows: Bina+2016 = Bina et al. (2016A&A...590A..14B) Cassata+2011 = Cassata et al. (2011A&A...525A.143C) Dawson+2007 = Dawson et al. (2007ApJ...671.1227D, Cat. J/ApJ/671/1227) Drake+2017a = Drake et al. (2017MNRAS.471..267D, Cat. J/MNRAS/471/267) Drake+2017b = Drake et al. (2017A&A...608A...6D) Konno+2016 = Konno et al. (2016ApJ...823...20K) Konno+2017 = Konno et al. (2018PASJ...70S..16K) Matthee+2017 = Matthee et al. (2014MNRAS.440.2375M) Ouchi+2008 = Ouchi et al. (2008ApJS..176..301O, Cat. J/ApJS/176/301) Perez+inprep = Perez et al. (in prep.) Santos+2016 = Santos et al. (2016MNRAS.463.1678S) Sobral+2017 = Sobral et al. 2017 (J/MNRAS/466/1242) -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 27-Apr-2021