Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/28813
Campo DC | Valore | Lingua |
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dc.contributor.author | Heintz, K. E. | en_US |
dc.contributor.author | Bolmer, J. | en_US |
dc.contributor.author | Ledoux, C. | en_US |
dc.contributor.author | Noterdaeme, P. | en_US |
dc.contributor.author | Krogager, J. -K. | en_US |
dc.contributor.author | Fynbo, J. P. U. | en_US |
dc.contributor.author | Jakobsson, P. | en_US |
dc.contributor.author | COVINO, Stefano | en_US |
dc.contributor.author | D'Elia, V. | en_US |
dc.contributor.author | De Pasquale, M. | en_US |
dc.contributor.author | Hartmann, D. H. | en_US |
dc.contributor.author | Izzo, L. | en_US |
dc.contributor.author | Japelj, J. | en_US |
dc.contributor.author | Kann, D. A. | en_US |
dc.contributor.author | Kaper, L. | en_US |
dc.contributor.author | Petitjean, P. | en_US |
dc.contributor.author | ROSSI, Andrea | en_US |
dc.contributor.author | SALVATERRA, Ruben | en_US |
dc.contributor.author | Schady, P. | en_US |
dc.contributor.author | Selsing, J. | en_US |
dc.contributor.author | Starling, R. | en_US |
dc.contributor.author | Tanvir, N. R. | en_US |
dc.contributor.author | Thöne, C. C. | en_US |
dc.contributor.author | de Ugarte Postigo, A. | en_US |
dc.contributor.author | Vergani, S. D. | en_US |
dc.contributor.author | Watson, D. | en_US |
dc.contributor.author | Wiersema, K. | en_US |
dc.contributor.author | Zafar, T. | en_US |
dc.date.accessioned | 2020-12-14T09:58:36Z | - |
dc.date.available | 2020-12-14T09:58:36Z | - |
dc.date.issued | 2019 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/28813 | - |
dc.description.abstract | We report the detections of molecular hydrogen (H<SUB>2</SUB>), vibrationally-excited H<SUB>2</SUB> (H<SUB>2</SUB><SUP>∗</SUP>), and neutral atomic carbon (C I), an efficient tracer of molecular gas, in two new afterglow spectra of GRBs 181020A (z = 2.938) and 190114A (z = 3.376), observed with X-shooter at the Very Large Telescope (VLT). Both host-galaxy absorption systems are characterized by strong damped Lyman-α absorbers (DLAs) and substantial amounts of molecular hydrogen with logN(H I, H<SUB>2</SUB>) = 22.20 ± 0.05, 20.40 ± 0.04 (GRB 181020A) and logN(H I, H<SUB>2</SUB>) = 22.15 ± 0.05, 19.44 ± 0.04 (GRB 190114A). The DLA metallicites, depletion levels, and dust extinctions are within the typical regimes probed by GRBs with [Zn/H] = -1.57 ± 0.06, [Zn/Fe] = 0.67 ± 0.03, and A<SUB>V</SUB> = 0.27 ± 0.02 mag (GRB 181020A) and [Zn/H] = -1.23 ± 0.07, [Zn/Fe] = 1.06 ± 0.08, and A<SUB>V</SUB> = 0.36 ± 0.02 mag (GRB 190114A). In addition, we examine the molecular gas content of all known H<SUB>2</SUB>-bearing GRB-DLAs and explore the physical conditions and characteristics required to simultaneously probe C I and H<SUB>2</SUB><SUP>∗</SUP>. We confirm that H<SUB>2</SUB> is detected in all C I- and H<SUB>2</SUB><SUP>∗</SUP>-bearing GRB absorption systems, but that these rarer features are not necessarily detected in all GRB H<SUB>2</SUB> absorbers. We find that a large molecular fraction of f<SUB>H<SUB>2</SUB></SUB> ≳ 10<SUP>-3</SUP> is required for C I to be detected. The defining characteristic for H<SUB>2</SUB><SUP>∗</SUP> to be present is less clear, though a large H<SUB>2</SUB> column density is an essential factor. We also find that the observed line profiles of the molecular-gas tracers are kinematically "cold", with small velocity offsets of δv < 20 km s<SUP>-1</SUP> from the bulk of the neutral absorbing gas. We then derive the H<SUB>2</SUB> excitation temperatures of the molecular gas and find that they are relatively low with T<SUB>ex</SUB> ≈ 100-300 K, however, there could be evidence of warmer components populating the high-J H<SUB>2</SUB> levels in GRBs 181020A and 190114A. Finally, we demonstrate that even though the X-shooter GRB afterglow campaign has been successful in recovering several H<SUB>2</SUB>-bearing GRB-host absorbers, this sample is still hampered by a significant dust bias excluding the most dust-obscured H<SUB>2</SUB> absorbers from identification. C I and H<SUB>2</SUB><SUP>∗</SUP> could open a potential route to identify molecular gas even in low-metallicity or highly dust-obscured bursts, though they are only efficient tracers for the most H<SUB>2</SUB>-rich GRB-host absorption systems. <P />Reduced spectra are also available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/629/A131">http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/629/A131</A>Based on observations collected at the European Southern Observatory, Paranal, Chile, under the Stargate consortium with Program ID: 0102.D-0662. | en_US |
dc.language.iso | eng | en_US |
dc.title | New constraints on the physical conditions in H<SUB>2</SUB>-bearing GRB-host damped Lyman-α absorbers | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201936250 | en_US |
dc.identifier.scopus | 2-s2.0-85080036464 | en_US |
dc.identifier.isi | 000485860300006 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/abs/2019/09/aa36250-19/aa36250-19.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 629 | en_US |
dc.relation.firstpage | A131 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2019A&A...629A.131H | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Brera | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.orcid | 0000-0001-9078-5507 | - |
crisitem.author.orcid | 0000-0002-8860-6538 | - |
crisitem.author.orcid | 0000-0002-9393-8078 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
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