Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/27727
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Tanvir, N. R. | en_US |
dc.contributor.author | Laskar, T. | en_US |
dc.contributor.author | Levan, A. J. | en_US |
dc.contributor.author | Perley, D. A. | en_US |
dc.contributor.author | Zabl, J. | en_US |
dc.contributor.author | Fynbo, J. P. U. | en_US |
dc.contributor.author | Rhoads, J. | en_US |
dc.contributor.author | Cenko, S. B. | en_US |
dc.contributor.author | Greiner, J. | en_US |
dc.contributor.author | Wiersema, K. | en_US |
dc.contributor.author | Hjorth, J. | en_US |
dc.contributor.author | Cucchiara, A. | en_US |
dc.contributor.author | Berger, E. | en_US |
dc.contributor.author | Bremer, M. N. | en_US |
dc.contributor.author | Cano, Z. | en_US |
dc.contributor.author | Cobb, B. E. | en_US |
dc.contributor.author | COVINO, Stefano | en_US |
dc.contributor.author | D'Elia, V. | en_US |
dc.contributor.author | Fong, W. | en_US |
dc.contributor.author | Fruchter, A. S. | en_US |
dc.contributor.author | Goldoni, P. | en_US |
dc.contributor.author | Hammer, F. | en_US |
dc.contributor.author | Heintz, K. E. | en_US |
dc.contributor.author | Jakobsson, P. | en_US |
dc.contributor.author | Kann, D. A. | en_US |
dc.contributor.author | Kaper, L. | en_US |
dc.contributor.author | Klose, S. | en_US |
dc.contributor.author | Knust, F. | en_US |
dc.contributor.author | Krühler, T. | en_US |
dc.contributor.author | Malesani, D. | en_US |
dc.contributor.author | Misra, K. | en_US |
dc.contributor.author | Nicuesa Guelbenzu, A. | en_US |
dc.contributor.author | Pugliese, G. | en_US |
dc.contributor.author | SANCHEZ RAMIREZ, RUBEN | en_US |
dc.contributor.author | Schulze, S. | en_US |
dc.contributor.author | Stanway, E. R. | en_US |
dc.contributor.author | de Ugarte Postigo, A. | en_US |
dc.contributor.author | Watson, D. | en_US |
dc.contributor.author | Wijers, R. A. M. J. | en_US |
dc.contributor.author | Xu, D. | en_US |
dc.date.accessioned | 2020-10-12T13:52:04Z | - |
dc.date.available | 2020-10-12T13:52:04Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/27727 | - |
dc.description.abstract | Gamma-ray bursts (GRBs) are powerful probes of early stars and galaxies, during and potentially even before the era of reionization. Although the number of GRBs identified at z ≳ 6 remains small, they provide a unique window on typical star-forming galaxies at that time, and thus are complementary to deep field observations. We report the identification of the optical drop-out afterglow of Swift GRB 120923A in near-infrared Gemini-North imaging, and derive a redshift of z={7.84}<SUB>-0.12</SUB><SUP>+0.06</SUP> from Very Large Telescope/X-shooter spectroscopy. At this redshift the peak 15-150 keV luminosity of the burst was 3.2 × 10<SUP>52</SUP> erg s<SUP>-1</SUP>, and in this sense it was a rather typical long-duration GRB in terms of rest frame luminosity. This burst was close to the Swift/Burst Alert Telescope detection threshold, and the X-ray and near-infrared afterglow were also faint. We present ground- and space-based follow-up observations spanning from X-ray to radio, and find that a standard external shock model with a constant-density circumburst environment of density n ≈ 4 × 10<SUP>-2</SUP> cm<SUP>-3</SUP> gives a good fit to the data. The near-infrared light curve exhibits a sharp break at t ≈ 3.4 days in the observer frame which, if interpreted as being due to a jet, corresponds to an opening angle of {θ }<SUB>jet</SUB>}≈ 5^\circ . The beaming-corrected γ-ray energy is then {E}<SUB>γ </SUB>≈ 2× {10}<SUP>50</SUP> erg, while the beaming-corrected kinetic energy is lower, {E}<SUB>{{K</SUB>}}≈ {10}<SUP>49</SUP> erg, suggesting that GRB 120923A was a comparatively low kinetic energy event. We discuss the implications of this event for our understanding of the high-redshift population of GRBs and their identification. | en_US |
dc.language.iso | eng | en_US |
dc.title | The Properties of GRB 120923A at a Spectroscopic Redshift of z ≈ 7.8 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/aadba9 | en_US |
dc.identifier.scopus | 2-s2.0-85054848197 | en_US |
dc.identifier.isi | 000445964000007 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/aadba9 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 865 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 107 | 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 | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2018ApJ...865..107T | 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::PE9_6 Stars and stellar systems | 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.orcid | 0000-0001-9078-5507 | - |
crisitem.author.orcid | 0000-0002-7158-5099 | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Tanvir_2018_ApJ_865_107.pdf | Pdf editoriale | 1.98 MB | Adobe PDF | View/Open |
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