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Solving the conundrum of intervening strong Mg II absorbers towards gamma-ray bursts and quasars

dc.contributor.authorCHRISTENSEN, L.
hal.structure.identifierGalaxies, Etoiles, Physique, Instrumentation [GEPI]
dc.contributor.authorVERGANI, S.
hal.structure.identifierWeizmann Institute of Science [Rehovot, Israël]
dc.contributor.authorSCHULZE, S.
dc.contributor.authorANNAU, N.
hal.structure.identifierDark Cosmology Centre [DARK]
dc.contributor.authorSELSING, J.
hal.structure.identifierNiels Bohr Institute [Copenhagen] [NBI]
dc.contributor.authorFYNBO, J.
hal.structure.identifierDark Cosmology Centre [DARK]
dc.contributor.authorDE UGARTE POSTIGO, A.
hal.structure.identifierInstitut d'astrophysique spatiale [IAS]
dc.contributor.authorCAÑAMERAS, R.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
dc.contributor.authorLOPEZ, S.
dc.contributor.authorPASSI, D.
dc.contributor.authorCORTÉS-ZULETA, P.
dc.contributor.authorELLISON, L.
dc.contributor.authorD’ODORICO, V.
dc.contributor.authorBECKER, G.
dc.contributor.authorBERG, A.
dc.contributor.authorCANO, Z.
hal.structure.identifierINAF - Osservatorio Astronomico di Brera [OAB]
dc.contributor.authorCOVINO, S.
dc.contributor.authorCUPANI, G.
hal.structure.identifierINAF - Osservatorio Astronomico di Roma [OAR]
dc.contributor.authorD’ELIA, V.
hal.structure.identifierAstroParticule et Cosmologie [APC (UMR_7164)]
dc.contributor.authorGOLDONI, P.
hal.structure.identifierFaculty of Mathematics and Physics [Ljubljana] [FMF]
dc.contributor.authorGOMBOC, A.
hal.structure.identifierGalaxies, Etoiles, Physique, Instrumentation [GEPI]
dc.contributor.authorHAMMER, F.
dc.contributor.authorHEINTZ, K.
hal.structure.identifierUniversity of Iceland [Reykjavik]
dc.contributor.authorJAKOBSSON, P.
hal.structure.identifierAstronomical Institute Anton Pannekoek [AI PANNEKOEK]
dc.contributor.authorJAPELJ, J.
hal.structure.identifierAstronomical Institute Anton Pannekoek [AI PANNEKOEK]
dc.contributor.authorKAPER, L.
hal.structure.identifierDark Cosmology Centre [DARK]
dc.contributor.authorMALESANI, D.
hal.structure.identifierInstitut de pharmacologie et de biologie structurale [IPBS]
dc.contributor.authorMOLLER, P.
hal.structure.identifierInstitut d'Astrophysique de Paris [IAP]
dc.contributor.authorPETITJEAN, P.
hal.structure.identifierAstronomical Institute Anton Pannekoek [AI PANNEKOEK]
dc.contributor.authorPUGLIESE, V.
hal.structure.identifierInstituto de Astrofísica de Andalucía [IAA]
dc.contributor.authorSÁNCHEZ-RAMÍREZ, R.
hal.structure.identifierDepartment of Physics and Astronomy [Leicester]
dc.contributor.authorTANVIR, N.
hal.structure.identifierInstituto de Astrofísica de Andalucía [IAA]
dc.contributor.authorTHÖNE, C.
hal.structure.identifierAarhus University [Aarhus]
dc.contributor.authorVESTERGAARD, M.
hal.structure.identifierDepartment of Physics and Astronomy [Leicester]
dc.contributor.authorWIERSEMA, K.
hal.structure.identifierMax-Planck-Institut für Astronomie [MPIA]
dc.contributor.authorWORSECK, G.
dc.date.issued2017
dc.identifier.issn0004-6361
dc.description.abstractEnPrevious studies have shown that the incidence rate of intervening strong Mg ii absorbers towards gamma-ray bursts (GRBs) were a factor of 2–4 higher than towards quasars. Exploring the similar sized and uniformly selected legacy data sets XQ-100 and XSGRB, each consisting of 100 quasar and 81 GRB afterglow spectra obtained with a single instrument (VLT/X-shooter), we demonstrate that there is no disagreement in the number density of strong Mg ii absorbers with rest-frame equivalent widths \hbox{$W_{\rm r}^{\lambda2796}>1$} Å towardsGRBs and quasars in the redshift range 0.1 ≲ z ≲ 5. With large and similar sample sizes, and path length coverages of Δz = 57.8 and 254.4 for GRBs and quasars, respectively, the incidences of intervening absorbers are consistent within 1σ uncertainty levels at all redshifts. For absorbers at z < 2.3, the incidence towards GRBs is a factor of 1.5 ± 0.4 higher than the expected number of strong Mg ii absorbers in Sloan Digital Sky Survey (SDSS) quasar spectra, while for quasar absorbers observed with X-shooter we find an excess factor of 1.4 ± 0.2 relative to SDSS quasars. Conversely, the incidence rates agree at all redshifts with reported high-spectral-resolution quasar data, and no excess is found. The only remaining discrepancy in incidences is between SDSS Mg ii catalogues and high-spectral-resolution studies. The rest-frame equivalent-width distribution also agrees to within 1σ uncertainty levels between the GRB and quasar samples. Intervening strong Mg ii absorbers towards GRBs are therefore neither unusually frequent, nor unusually strong.
dc.description.sponsorshipUsing the most powerful explosion as probes of the high-redshift Universe
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enquasars: absorption lines
dc.subject.engamma rays: general
dc.subject.engalaxies: halos
dc.title.enSolving the conundrum of intervening strong Mg II absorbers towards gamma-ray bursts and quasars
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201731382
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA]
dc.identifier.arxiv1709.01084
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageA84
bordeaux.volume608
bordeaux.peerReviewedoui
hal.identifierhal-02268008
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02268008v1
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