dc.contributor.author | Petitjean, P. | |
dc.contributor.author | Vergani, S. D. | |
dc.contributor.author | Japelj, J. | |
dc.contributor.author | Fynbo, J. P. U. | |
dc.contributor.author | Gronke, M. | |
dc.contributor.author | Heintz, K. E. | |
dc.contributor.author | Malesani, D. B. | |
dc.contributor.author | Tanvir, N. R. | |
dc.contributor.author | D'Elia, V. | |
dc.contributor.author | Kann, D. A. | |
dc.contributor.author | Palmerio, J. T. | |
dc.contributor.author | Salvaterra, R. | |
dc.contributor.author | Wiersema, K. | |
dc.contributor.author | Arabsalmani, M. | |
dc.contributor.author | Campana, S. | |
dc.contributor.author | Covino, S. | |
dc.contributor.author | Postigo, A. de Ugarte | |
dc.contributor.author | Hammer, F. | |
dc.contributor.author | Hartmann, D. H. | |
dc.contributor.author | Jakobsson, P. | |
dc.contributor.author | Kouveliotou, C. | |
dc.contributor.author | Laskar, T. | |
dc.contributor.author | Levan, A. J. | |
dc.contributor.author | Rossi, A. | |
dc.contributor.author | De Pasquale, M. | |
dc.contributor.author | Vielfaure, J. -B. | |
dc.date.accessioned | 2021-03-03T18:00:02Z | |
dc.date.available | 2021-03-03T18:00:02Z | |
dc.identifier.citation | Vielfaure J. -. , Vergani S. D. , Japelj J., Fynbo J. P. U. , Gronke M., Heintz K. E. , Malesani D. B. , Petitjean P., Tanvir N. R. , D'Elia V., et al., "Lyman continuum leakage in faint star-forming galaxies at redshift z=3-3.5 probed by gamma-ray bursts", ASTRONOMY & ASTROPHYSICS, cilt.641, 2020 | |
dc.identifier.issn | 0004-6361 | |
dc.identifier.other | av_4cac3458-ddb7-43b1-82cf-5f3727d8120d | |
dc.identifier.other | vv_1032021 | |
dc.identifier.uri | http://hdl.handle.net/20.500.12627/54885 | |
dc.identifier.uri | https://doi.org/10.1051/0004-6361/202038316 | |
dc.description.abstract | Context. The identification of the sources that reionized the Universe and their specific contribution to this process are key missing pieces of our knowledge of the early Universe. Faint star-forming galaxies may be the main contributors to the ionizing photon budget during the epoch of reionization, but their escaping photons cannot be detected directly due to inter-galactic medium opacity. Hence, it is essential to characterize the properties of faint galaxies with significant Lyman continuum (LyC) photon leakage up to z similar to 4 to define indirect indicators allowing analogs to be found at the highest redshift.Aims. Long gamma-ray bursts (LGRBs) typically explode in star-forming regions of faint, star-forming galaxies. Through LGRB afterglow spectroscopy it is possible to detect directly LyC photons. Our aim is to use LGRBs as tools to study LyC leakage from faint, star-forming galaxies at high redshift.Methods. Here we present the observations of LyC emission in the afterglow spectra of GRB 191004B at z=3.5055, together with those of the other two previously known LyC-leaking LGRB host galaxies (GRB 050908 at z=3.3467, and GRB 060607A at z=3.0749), to determine their LyC escape fraction and compare their properties.Results. From the afterglow spectrum of GRB 191004B we determine a neutral hydrogen column density at the LGRB redshift of log(N-HI/cm(-2)) = 17.2 +/- 0.15, and negligible extinction (A(V)=0.03 +/- 0.02 mag). The only metal absorption lines detected are CIV and SiIV. In contrast to GRB 050908 and GRB 060607A, the host galaxy of GRB 191004B displays significant Lyman-alpha (Ly alpha) emission. From its Ly alpha emission and the non-detection of Balmer emission lines we constrain its star-formation rate (SFR) to 1 <= SFR <= 4.7 M-circle dot yr(-1). We fit the Ly alpha emission with a shell model and find parameters values consistent with the observed ones. The absolute (relative) LyC escape fractions we find for GRB 191004B, GRB 050908 and GRB 060607A are of | |
dc.language.iso | eng | |
dc.subject | Uzay bilimi | |
dc.subject | ASTRONOMİ VE ASTROFİZİK | |
dc.subject | Temel Bilimler (SCI) | |
dc.subject | Fizik | |
dc.subject | Astronomi ve Astrofizik | |
dc.subject | Temel Bilimler | |
dc.title | Lyman continuum leakage in faint star-forming galaxies at redshift z=3-3.5 probed by gamma-ray bursts | |
dc.type | Makale | |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | |
dc.contributor.department | Centre National de la Recherche Scientifique (CNRS) , , | |
dc.identifier.volume | 641 | |
dc.contributor.firstauthorID | 2287107 | |