Please use this identifier to cite or link to this item: http://hdl.handle.net/2307/374
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dc.contributor.authorBranchini, Enzo-
dc.contributor.authorUrsino, Eugenio-
dc.contributor.authorCorsi, A.-
dc.contributor.authorMartizzi, Davide-
dc.contributor.authorAmati, L.-
dc.contributor.authorden Herder, J. W.-
dc.contributor.authorGaleazzi, M.-
dc.contributor.authorGendre, B.-
dc.contributor.authorKaastra, J.-
dc.contributor.authorMoscardini, L.-
dc.contributor.authorNicastro, F.-
dc.contributor.authorOhashi, T.-
dc.contributor.authorPaerels, F.-
dc.contributor.authorPiro, L.-
dc.contributor.authorRoncarelli, M.-
dc.contributor.authorTakei, Y.-
dc.contributor.authorViel, M.-
dc.date.accessioned2010-07-28T15:17:14Z-
dc.date.available2010-07-28T15:17:14Z-
dc.date.issued2009-05-20-
dc.identifier.issn0004-637X-
dc.identifier.urihttp://hdl.handle.net/2307/374-
dc.description.abstractWe assess the possibility of detecting and characterizing the physical state of the missing baryons at low redshift by analyzing the X-ray absorption spectra of the gamma-ray burst (GRB) afterglows, measured by a microcalorimeter-based detector with 3 eV resolution and 1000 cm2 effective area and capable of fast repointing, similar to that on board of the recently proposed X-ray satellites EDGE and XENIA. For this purpose we have analyzed mock absorption spectra extracted from different hydrodynamical simulations used to model the properties of the warm hot intergalactic medium (WHIM). These models predict the correct abundance of OVI absorption lines observed in UV and satisfy current X-ray constraints. According to these models space missions such as EDGE and XENIA should be able to detect similar to 60 WHIM absorbers per year through the OVII line. About 45% of these have at least two more detectable lines in addition to OVII that can be used to determine the density and the temperature of the gas. Systematic errors in the estimates of the gas density and temperature can be corrected for in a robust, largely model-independent fashion. The analysis of the GRB absorption spectra collected in three years would also allow to measure the cosmic mass density of the WHIM with similar to 15% accuracy, although this estimate depends on the WHIM model. Our results suggest that GRBs represent a valid, if not preferable, alternative to active galactic nuclei to study the WHIM in absorption. The analysis of the absorption spectra nicely complements the study of the WHIM in emission that the spectrometer proposed for EDGE and XENIA would be able to carry out thanks to its high sensitivity and large field of view.en
dc.language.isoenen
dc.publisherInstitute of Physics Publishingen
dc.relation.ispartofAstrophysical Journalen
dc.rightsThe American Astronomical Societyen
dc.subjectLYMAN-ALPHA FORESTen
dc.subjectGAS-RICH GALAXIESen
dc.subjectLOW-REDSHIFTen
dc.subjectMISSING BARYONSen
dc.subjectLOCAL UNIVERSEen
dc.subjectHYDRODYNAMICAL SIMULATIONen
dc.subjectCOSMOLOGICAL SIMULATIONSen
dc.subjectCONSTRAINED SIMULATIONSen
dc.subjectSURFACE BRIGHTNESSen
dc.subjectABSORPTION-LINESen
dc.titleStudying the warm hot intergalactic medium with gamma-ray burstsen
dc.typeArticleen
dc.subject.miurSettori Disciplinari MIUR::Scienze fisiche::ASTRONOMIA E ASTROFISICAen
dc.subject.isicruiCategorie ISI-CRUI::Scienze fisiche::Space Scienceen
dc.subject.anagraferoma3Scienze fisicheen
dc.relation.volumenumber697en
dc.relation.pagenumber328-344en
dc.identifier.doi10.1088/0004-637X/697/1/328-
dc.relation.issuenumber1en
item.languageiso639-1other-
item.fulltextWith Fulltext-
item.grantfulltextrestricted-
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'
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