The VIMOS Ultra Deep Survey The role of HI kinematics and HI column density on the escape of Ly alpha photons in star-forming galaxies at 2 < z < 4

0484648 - ASÚ 2018 RIV FR eng J - Článek v odborném periodiku
Guaita, L. - Talia, M. - Pentericci, L. - Verhamme, A. - Cassata, P. - Lemaux, B. C. - Orlitová, Ivana - Ribeiro, B. - Schaerer, D. - Zamorani, G. - Garilli, B. - Le Brun, V. - Le Fevre, O. - Maccagni, D. - Tasca, L. A. M. - Thomas, R. - Vanzella, E. - Zucca, E. - Amorin, R. - Bardelli, S. - Castellano, M. - Grazian, A. - Hathi, N. P. - Koekemoer, A. - Marchi, F.
The VIMOS Ultra Deep Survey The role of HI kinematics and HI column density on the escape of Ly alpha photons in star-forming galaxies at 2 < z < 4.
Astronomy & Astrophysics. Roč. 606, September (2017), A19/1-A19/17. ISSN 0004-6361. E-ISSN 1432-0746
Grant CEP: GA ČR(CZ) GJ17-06217Y
Institucionální podpora: RVO:67985815
Klíčová slova: lyman break galaxies * cosmic reionization * emitting galaxies
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.565, rok: 2017

We wish to assess the role of kinematics and neutral hydrogen column density in the escape and distribution of Ly alpha photons. We selected a sample of 76 Ly alpha emitting galaxies from the VIMOS Ultra Deep Survey (VUDS) at 2 <= z <= 4. We estimated the velocity of the neutral gas flowing out of the interstellar medium as the velocity off set, Delta v, between the systemic redshift (z(sys)) and the center of low-ionization absorption line systems (LIS). To increase the S/N of VUDS spectra, we stacked subsamples defined based on median values of their photometric and spectroscopic properties. We measured the systemic redshift from the rest-frame UV spectroscopic data using the CIII] 1908 nebular emission line, and we considered SiII1526 as the highest signal-to-noise LIS line. We calculated the Ly alpha peak shift with respect to the z(sys), the EW(Ly alpha), and the Ly alpha spatial extension, Ext(Ly alpha-C), from the in the 2D stacked spectra.
Trvalý link: http://hdl.handle.net/11104/0280185