J/ApJ/920/122 Candidate Ly{alpha}-emitting galaxies spectra (Davis+, 2021) ================================================================================ Detection of Lyman Continuum from 3.0 =2021ApJ...920..122D ================================================================================ ADC_Keywords: Galaxies; Spectra, ultraviolet; Redshifts Keywords: Reionization ; Lyman-alpha galaxies Abstract: Questions as to what drove the bulk reionization of the universe, how that reionization proceeded, and how the hard ionizing radiation reached the intergalactic medium remain open and debated. Observations probing that epoch are severely hampered by the increasing amounts of neutral gas with increasing redshift, so a small, but growing, number of experiments are targeting star-forming galaxies (z~3) as proxies. However, these studies, while providing fantastic detail, are time intensive, contain relatively few targets, and can suffer from selection biases. As a complementary alternative, we investigate whether stacking the already vast (and growing) numbers of low- resolution ({Delta}{lambda}/{lambda}=800) Ly{alpha}-emitting (LAE) galaxy spectra from the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) can be used to measure ionizing photons (rest-frame 880-910{AA}) escaping their galaxy hosts. As a blind survey, HETDEX avoids the biases from continuum-selected galaxies, and its planned 540deg^2^ coverage promotes the statistical power of large numbers. In this paper, we confirm the feasibility of Lyman continuum detection by carefully selecting a sample of 214 high-redshift (z~3) LAEs from a subset of HETDEX observations, stacking their spectra and measuring a >~3{sigma} detection of 0.10{mu}Jy rest-frame Lyman continuum emission, uncorrected for attenuation in the intergalactic medium, over the full sample stack (3.03 (Feltre+, 2020) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 I10 --- ID Detection ID 12- 37 A26 --- Name HETDEX Detection Name, JHHMMSS.ss+DDMMSS.s 39- 46 F8.4 deg RAdeg [165/230] Right Ascension (ICRS) 48- 54 F7.4 deg DEdeg [48/57] Declination, decimal degrees (ICRS) 56- 61 F6.4 --- zspec [2.99/3.5] Spectroscopic redshift 63- 67 F5.2 mag rmag [23.5/26.5] r-band magnitude 69- 73 F5.3 mag e_rmag [0.04/2]?=0.000 Uncertainty in rmag (1) -------------------------------------------------------------------------------- Note (1): Entries with no result are fainter than the imaging magnitude limit of 26.5. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 7 F7.2 0.1nm lambda1 [780/1378] Full sample, wavelength 9- 15 F7.4 10-17mW/m2 flux1 [-8.6/60]? Full sample, flux (1) 17- 22 F6.4 10-17mW/m2 e_flux1 [0.4/8]? Full sample, flux uncertainty (1) 24- 30 F7.2 0.1nm lambda2 [782/1379]? Brightest 1/3, wavelength 32- 39 F8.4 10-17mW/m2 flux2 [-12/68]? Brightest 1/3, flux (1) 41- 47 F7.4 10-17mW/m2 e_flux2 [0.7/13]? Brightest 1/3, flux uncertainty (1) 49- 55 F7.2 0.1nm lambda3 [780/1378] Faintest 2/3, wavelength 57- 64 F8.4 10-17mW/m2 flux3 [-39/56]? Faintest 2/3, flux (1) 66- 72 F7.4 10-17mW/m2 e_flux3 [0.4/13]? Faintest 2/3, flux uncertainty (1) 74- 80 F7.2 0.1nm lambda4 [779/1378]? Faintest 1/3, wavelength 82- 89 F8.4 10-17mW/m2 flux4 [-18/54]? Faintest 1/3, flux (1) 91- 97 F7.4 10-17mW/m2 e_flux4 [0.6/21]? Faintest 1/3 flux uncertainty (1) -------------------------------------------------------------------------------- Note (1): Null entries for the flux# and e_flux# are present only for alignment across the four samples. -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Prepared by [AAS], Coralie Fix [CDS], 13-Feb-2024