dc.contributor.author | Tanga, M. | |
dc.contributor.author | Schady, P. | |
dc.contributor.author | Gatto, A. | |
dc.contributor.author | Greiner, J. | |
dc.contributor.author | Krause, M.~G.~H. | |
dc.contributor.author | Diehl, R. | |
dc.contributor.author | Savaglio, S. | |
dc.contributor.author | Walch, S. | |
dc.date.accessioned | 2017-01-23T18:39:44Z | |
dc.date.available | 2017-01-23T18:39:44Z | |
dc.date.issued | 2016-11-01 | |
dc.identifier.citation | Tanga , M , Schady , P , Gatto , A , Greiner , J , Krause , M G H , Diehl , R , Savaglio , S & Walch , S 2016 , ' Soft X-ray absorption excess in gamma-ray burst afterglow spectra: Absorption by turbulent ISM ' , Astronomy & Astrophysics , vol. 595 , A24 . https://doi.org/10.1051/0004-6361/201527961 | |
dc.identifier.issn | 0004-6361 | |
dc.identifier.other | Bibtex: urn:b5eff07e0a8983970b1092d559a7280b | |
dc.identifier.other | ORCID: /0000-0002-9610-5629/work/63687420 | |
dc.identifier.uri | http://hdl.handle.net/2299/17544 | |
dc.description | This is the accepted manuscript version of the following article: M. Tanga, P. Schady, A. Gatto, J. Greiner, M. G. H. Krause, R. Diehl, S. Savaglio, and S. Walch, ‘Soft X-ray absorption excess in gamma-ray burst afterglow spectra: Absorption by turbulent ISM’ Astronomy & Astrophysics, Vol 595, November 2016, A24. The final, published version is available online at doi: http://dx.doi.org/10.1051/0004-6361/201527961 Reproduced with permission from Astronomy & Astrophysics. © 2018 ESO. | |
dc.description.abstract | Two-thirds of long duration gamma-ray bursts (GRBs) show soft X-ray absorption in excess of the Milky Way. The column densities of metals inferred from UV and optical spectra differ from those derived from soft X-ray spectra, at times by an order of magnitude, with the latter being higher. The origin of the soft X-ray absorption excess observed in GRB X-ray afterglow spectra remains a heavily debated issue, which has resulted in numerous investigations on the effect of hot material both internal and external to the GRB host galaxy on our X-ray afterglow observations. Nevertheless, all models proposed so far have either only been able to account for a subset of our observations (i.e. at z > 2), or they have required fairly extreme conditions to be present within the absorbing material. In this paper, we investigate the absorption of the GRB afterglow by a collisionally ionised and turbulent interstellar medium (ISM). We find that a dense (3 per cubic centimeters) collisionally ionised ISM could produce UV/optical and soft X-ray absorbing column densities that differ by a factor of 10, however the UV/optical and soft X-ray absorbing column densities for such sightlines and are 2-3 orders of magnitude lower in comparison to the GRB afterglow spectra. For those GRBs with a larger soft X-ray excess of up to an order of magnitude, the contribution in absorption from a turbulent ISM as considered here would ease the required conditions of additional absorbing components, such as the GRB circumburst medium and intergalactic medium. | en |
dc.format.extent | 10 | |
dc.format.extent | 2650656 | |
dc.language.iso | eng | |
dc.relation.ispartof | Astronomy & Astrophysics | |
dc.subject | Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Astrophysics of Galaxies | |
dc.title | Soft X-ray absorption excess in gamma-ray burst afterglow spectra: Absorption by turbulent ISM | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Centre for Astrophysics Research | |
dc.description.status | Peer reviewed | |
dc.date.embargoedUntil | 2017-10-24 | |
dc.identifier.url | https://arxiv.org/pdf/1603.05123v1.pdf | |
rioxxterms.versionofrecord | 10.1051/0004-6361/201527961 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |