Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/37893
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dc.contributor.authorMichalowski, M. J.-
dc.contributor.authorGentile, G.-
dc.contributor.authorHjorth, J.-
dc.contributor.authorKrumholz, M. R.-
dc.contributor.authorTanvir, N. R.-
dc.contributor.authorKamphuis, P.-
dc.contributor.authorBurlon, D.-
dc.contributor.authorBaes, M.-
dc.contributor.authorBasa, S.-
dc.contributor.authorBerta, S.-
dc.contributor.authorCastro Ceron, J. M.-
dc.contributor.authorCrosby, D.-
dc.contributor.authorD'Elia, V.-
dc.contributor.authorElliott, J.-
dc.contributor.authorGreiner, J.-
dc.contributor.authorHunt, L. K.-
dc.contributor.authorKlose, S.-
dc.contributor.authorKoprowski, M. P.-
dc.contributor.authorLe Floc'h, E.-
dc.contributor.authorMalesani, D.-
dc.contributor.authorMurphy, T.-
dc.contributor.authorGuelbenzu, A. N.-
dc.contributor.authorPalazzi, E.-
dc.contributor.authorRasmussen, J.-
dc.contributor.authorRossi, A.-
dc.contributor.authorSavaglio, S.-
dc.contributor.authorSchady, P.-
dc.contributor.authorSollerman, J.-
dc.contributor.authorde Ugarte Postigo, A.-
dc.contributor.authorWatson, D.-
dc.contributor.authorvan der Werf, P.-
dc.contributor.authorVergani, S. D.-
dc.contributor.authorXu, D.-
dc.date.accessioned2016-08-02T11:32:50Z-
dc.date.available2016-08-02T11:32:50Z-
dc.date.issued2015-10-01-
dc.identifier.citationAstronomy and Astrophysics, 2015, 582, A78en
dc.identifier.issn0004-6361-
dc.identifier.urihttp://www.aanda.org/articles/aa/abs/2015/10/aa26542-15/aa26542-15.htmlen
dc.identifier.urihttp://hdl.handle.net/2381/37893-
dc.description.abstractLong gamma-ray bursts (GRBs), among the most energetic events in the Universe, are explosions of massive and short-lived stars, so they pinpoint locations of recent star formation. However, several GRB host galaxies have recently been found to be deficient in molecular gas (H2), believed to be the fuel of star formation. Moreover, optical spectroscopy of GRB afterglows implies that the molecular phase constitutes only a small fraction of the gas along the GRB line of sight. Here we report the first ever 21 cm line observations of GRB host galaxies, using the AustraliaTelescope Compact Array, implying high levels of atomic hydrogen (H i), which suggests that the connection between atomic gas and star formation is stronger than previously thought. In this case, it is possible that star formation is directly fuelled by atomic gas (or that the H i-to-H2 conversion is very efficient, which rapidly exhaust molecular gas), as has been theoretically shown to be possible. This can happen in low-metallicity gas near the onset of star formation because cooling of gas (necessary for star formation) is faster than the H i-to-H2 conversion. Indeed, large atomic gas reservoirs, together with low molecular gas masses, stellar, and dust masses are consistent with GRB hosts being preferentially galaxies which have very recently started a star formation episode after accreting metal-poor gas from the intergalactic medium. This provides a natural route for forming GRBs in low-metallicity environments. The gas inflow scenario is also consistent with the existence of the companion H I object with no optical counterpart ~19 kpc from the GRB 060505 host, and with the fact that the H I centroids of the GRB 980425 and 060505 hosts do not coincide with optical centres of these galaxies, but are located close to the GRB positions.en
dc.language.isoenen
dc.publisherEDP Sciences on behalf of European Southern Observatory (ESO)en
dc.rightsCopyright © ESO, 2015. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.en
dc.subjectScience & Technologyen
dc.subjectPhysical Sciencesen
dc.subjectAstronomy & Astrophysicsen
dc.subjectdust, extinctionen
dc.subjectgalaxies: ISMen
dc.subjectgalaxies: star formationen
dc.subjectgamma;ray burst: generalen
dc.subjectradio continuum: galaxiesen
dc.subjectradio lines: galaxiesen
dc.subjectHERSCHEL REFERENCE SURVEYen
dc.subjectGIANT MOLECULAR CLOUDSen
dc.subjectLARGE-MAGELLANIC-CLOUDen
dc.subjectGRB 980425/SN 1998BWen
dc.subjectSPECTRAL ENERGY-DISTRIBUTIONSen
dc.subjectVLT/X-SHOOTER SPECTROSCOPYen
dc.subjectNOBEYAMA MILLIMETER ARRAYen
dc.subjectCOSMIC CHEMICAL EVOLUTIONen
dc.subjectFORMING DWARF GALAXIESen
dc.subjectHIGH-METALLICITY HOSTen
dc.titleMassive stars formed in atomic hydrogen reservoirs: H I observations of gamma-ray burst host galaxiesen
dc.typeJournal Articleen
dc.identifier.doi10.1051/0004-6361/201526542-
dc.identifier.eissn1432-0746-
dc.description.statusPeer-revieweden
dc.description.versionPublisher Versionen
dc.type.subtypeArticle;Journal-
pubs.organisational-group/Organisationen
pubs.organisational-group/Organisation/COLLEGE OF SCIENCE AND ENGINEERINGen
pubs.organisational-group/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomyen
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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