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Journal articles
The high-redshift gamma-ray burst GRB 140515A: A comprehensive X-ray and optical study
A. Melandri
1
M. G. Bernardini
1
P. D’avanzo
1
R. Sánchez-Ramírez
F. Nappo
1
L. Nava
J. Japelj
A. de Ugarte Postigo
2
S. Oates
S. Campana
1
S. Covino
1
V. D’elia
G. Ghirlanda
1
E. Gafton
G. Ghisellini
1
N. Gnedin
P. Goldoni
3
J. Gorosabel
T. Libbrecht
D. Malesani
2
R. Salvaterra
C. C. Thöne
S. D. Vergani
4, 1
D. Xu
2
G. Tagliaferri
1
R. Salvaterra
Author
C. C. Thöne
Author
S. D. Vergani 4, 1
Author IdHAL : 0000-0001-9398-4907 arXiv : https://arxiv.org/a/susilandia ORCID : https://orcid.org/0000-0001-9398-4907
D. Xu 2
Author
G. Tagliaferri 1
Author
1
OAB - INAF - Osservatorio Astronomico di Brera (Via E. Bianchi 46, 23807 Merate / via Brera 28, 20121 Milano - Italy)
- INAF - Istituto Nazionale di Astrofisica (Viale del Parco Mellini 84, 00136 Roma - Italy)
2
DARK - Dark Cosmology Centre (Lyngbyvej 2, 4. sal
2100 Copenhagen Ø. - Denmark)
- NBI - Niels Bohr Institute [Copenhagen] (Blegdamsvej 17, DK-2100 Copenhagen - Denmark)
- Faculty of Science [Copenhagen] (Bülowsvej 17
1870 Frederiksberg C
Copenhagen
- Denmark)
- KU - University of Copenhagen = Københavns Universitet (Nørregade 10, 1165 København, Danemark - Denmark)
- Faculty of Science [Copenhagen] (Bülowsvej 17
1870 Frederiksberg C
Copenhagen
- Denmark)
3
APC (UMR_7164) - AstroParticule et Cosmologie (APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13 - France)
- Observatoire de Paris (61 Av de l'Observatoire 75014 PARIS - France)
- PSL - Université Paris sciences et lettres (60 rue Mazarine 75006 Paris - France)
- CEA - Commissariat à l'énergie atomique et aux énergies alternatives : DRF/IRFU (Centre de Saclay Centre de Grenoble Centre de Cadarache etc - France)
- UPD7 - Université Paris Diderot - Paris 7 : UMR_7164 (5 rue Thomas-Mann - 75205 Paris cedex 13 - France)
- CNRS - Centre National de la Recherche Scientifique : UMR_7164 (France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
4
GEPI - Galaxies, Etoiles, Physique, Instrumentation (5, place Jules Janssen 92195 MEUDON CEDEX - France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- Observatoire de Paris (61 Av de l'Observatoire 75014 PARIS - France)
- PSL - Université Paris sciences et lettres (60 rue Mazarine 75006 Paris - France)
- UPD7 - Université Paris Diderot - Paris 7 : UMR_8111 (5 rue Thomas-Mann - 75205 Paris cedex 13 - France)
- CNRS - Centre National de la Recherche Scientifique : UMR_8111 (France)
Abstract : High-redshift gamma-ray bursts (GRBs) offer several advantages when studying the distant Universe, providing unique information about the structure and properties of the galaxies in which they exploded. Spectroscopic identification with large ground-based telescopes has improved our knowledge of this kind of distant events. We present the multi-wavelength analysis of the high-zSwift GRB GRB 140515A (z = 6.327). The best estimate of the neutral hydrogen fraction of the intergalactic medium towards the burst is xHI ≤ 0.002. The spectral absorption lines detected for this event are the weakest lines ever observed in GRB afterglows, suggesting that GRB 140515A exploded in a very low-density environment. Its circum-burst medium is characterised by an average extinction (AV ~ 0.1) that seems to be typical of z ≥ 6 events. The observed multi-band light curves are explained either with a very hard injected spectrum (p = 1.7) or with a multi-component emission (p = 2.1). In the second case a long-lasting central engine activity is needed in order to explain the late time X-ray emission. The possible origin of GRB 140515A in a Pop III (or in a Pop II star with a local environment enriched by Pop III) massive star is unlikely.
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Journal articles
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https://hal-cea.archives-ouvertes.fr/cea-01383682
Contributor : Edp Sciences <>
Submitted on : Wednesday, October 19, 2016 - 10:13:36 AM
Last modification on : Monday, December 14, 2020 - 1:02:03 PM
Contributor : Edp Sciences <>
Submitted on : Wednesday, October 19, 2016 - 10:13:36 AM
Last modification on : Monday, December 14, 2020 - 1:02:03 PM
File
aa26660-15.pdf
Publication funded by an institution
Identifiers
- HAL Id : cea-01383682, version 1
- DOI : 10.1051/0004-6361/201526660
- ARXIV : 1506.03079
- BIBCODE : 2015A&A...581A..86M
Collections
CEA | CNRS | OBSPM | IN2P3 | INSU | APC | IRFU-APC | DSM-IRFU | CEA-DRF | UNIV-PARIS7 | USPC | UNIV-PARIS | UP-SCIENCES | PSL
Citation
A. Melandri, M. G. Bernardini, P. D’avanzo, R. Sánchez-Ramírez, F. Nappo, et al.. The high-redshift gamma-ray burst GRB 140515A: A comprehensive X-ray and optical study. Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 581, pp.A86. ⟨10.1051/0004-6361/201526660⟩. ⟨cea-01383682⟩
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