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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27052
Title: VIMOS Ultra-Deep Survey (VUDS): IGM transmission towards galaxies with 2.5 < z < 5.5 and the colour selection of high-redshift galaxies
Authors: Thomas, R.
Le Fèvre, O.
Le Brun, V.
Cassata, P.
GARILLI, BIANCA MARIA ROSA 
Lemaux, B. C.
Maccagni, D.
PENTERICCI, Laura 
Tasca, L. A. M.
Zamorani, G.
ZUCCA, Elena 
Amorin, R.
BARDELLI, Sandro 
CASSARA, LETIZIA PASQUA 
CASTELLANO, MARCO 
Cimatti, A.
CUCCIATI, Olga 
Durkalec, A.
FONTANA, Adriano 
Giavalisco, M.
GRAZIAN, Andrea 
Hathi, N. P.
Ilbert, O.
Paltani, S.
Pforr, J.
Ribeiro, B.
Schaerer, D.
SCODEGGIO, MARCO 
Sommariva, V.
Talia, M.
Tresse, L.
VANZELLA, Eros 
VERGANI, DANIELA 
Capak, P.
Charlot, S.
Contini, T.
Cuby, J. G.
de la Torre, S.
Dunlop, J.
Fotopoulou, S.
Koekemoer, A.
López-Sanjuan, C.
Mellier, Y.
Salvato, M.
Scoville, N.
Taniguchi, Y.
Wang, P. W.
Issue Date: 2017
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 597
First Page: A88
Abstract: The observed UV rest-frame spectra of distant galaxies are the result of their intrinsic emission combined with absorption along the line of sight produced by the inter-galactic medium (IGM). Here we analyse the evolution of the mean IGM transmission Tr(Lyα) and its dispersion along the line of sight for 2127 galaxies with 2.5 < z < 5.5 in the VIMOS Ultra Deep Survey (VUDS). We fitted model spectra combined with a range of IGM transmission to the galaxy spectra using the spectral fitting algorithm GOSSIP+. We used these fits to derive the mean IGM transmission towards each galaxy for several redshift slices from z = 2.5 to z = 5.5. We found that the mean IGM transmission defined as Tr(Lyα) = e<SUP>- τ</SUP> (with τ as the HI optical depth) is 79%, 69%, 59%, 55%, and 46% at redshifts 2.75, 3.22, 3.70, 4.23, and 4.77, respectively. We compared these results to measurements obtained from quasar lines of sight and found that the IGM transmission towards galaxies is in excellent agreement with quasar values up to redshift z 4. We found tentative evidence for a higher IGM transmission at z ≥ 4 compared to results from QSOs, but a degeneracy between dust extinction and IGM prevents us from firmly concluding whether the internal dust extinction for star-forming galaxies at z > 4 takes a mean value significantly in excess of E(B-V) > 0.15. Most importantly, we found a large dispersion of IGM transmission along the lines of sight towards distant galaxies with 68% of the distribution within 10 to 17% of the median value in δz = 0.5 bins, similar to what is found on the lines of sight towards QSOs. We demonstrate that taking this broad range of IGM transmission into account is important when selecting high-redshift galaxies based on their colour properties (e.g. LBG or photometric redshiftselection) because failing to do so causes a significant incompleteness in selecting high-redshift galaxy populations. We finally discuss the observed IGM properties and speculate that the broad range of observed transmissions might be the result of cosmic variance and clustering along lines of sight. This clearly shows that the sources that cause this extinction need to be more completely modelled. Based on data obtained with the European Southern Observatory Very Large Telescope, Paranal, Chile, under Large Program 185.A-0791.
URI: http://hdl.handle.net/20.500.12386/27052
URL: https://www.aanda.org/articles/aa/abs/2017/01/aa25342-14/aa25342-14.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201425342
Bibcode ADS: 2017A&A...597A..88T
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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