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dc.contributor.authorTotani, T
dc.contributor.authorKobayashi, Chiaki
dc.date.accessioned2011-12-20T13:01:09Z
dc.date.available2011-12-20T13:01:09Z
dc.date.issued1999-12-01
dc.identifier.citationTotani , T & Kobayashi , C 1999 , ' Evolution of dust extinction and supernova cosmology ' , Astrophysical Journal Letters , vol. 526 , no. 2 , pp. L65-L68 . https://doi.org/10.1086/312377
dc.identifier.issn2041-8213
dc.identifier.otherPURE: 494561
dc.identifier.otherPURE UUID: 4805fadb-34d6-40ee-81c5-3375c4a20de6
dc.identifier.otherWOS: 000084116600003
dc.identifier.otherScopus: 0033269281
dc.identifier.otherORCID: /0000-0002-4343-0487/work/62750451
dc.identifier.urihttp://hdl.handle.net/2299/7412
dc.description.abstractWe have made a quantitative calculation for the systematic evolution of the average extinction by interstellar dust in host galaxies of high-redshift Type Ia supernovae by using a realistic model of photometric and chemical evolution of galaxies and supernova rate histories in various galaxy types. We find that the average B-band extinction [A(B)] at z similar to 0.5 is typically 0.1-0.2 mag larger than the present value, under a natural assumption that dust optical depth is proportional to gas column density and gas metallicity. This systematic evolution causes average reddening with E(B-V) similar to 0.025-0.05 mag with the standard extinction curve, and this is comparable with the observational uncertainty of the reddening of high-redshift supernovae. Therefore, our result does not contradict the observations that show no significant reddening in high-z supernovae. However, the difference in apparent magnitude between an open universe and a Lambda-dominated flat universe is only similar to 0.2 mag at z similar to 0.5, and hence this systematic evolution of extinction should be taken into account in a reliable measurement of cosmological parameters. Considering this uncertainty, we show that it is difficult to discriminate between open and Lambda-dominated flat cosmologies from the current data.en
dc.format.extent4
dc.language.isoeng
dc.relation.ispartofAstrophysical Journal Letters
dc.rightsOpen
dc.subjectcosmology : observations
dc.subjectdust, extinction
dc.subjectgalaxies : evolution
dc.subjectsupernovae : general
dc.subjectIA SUPERNOVAE
dc.subjectGALAXIES
dc.subjectLUMINOSITY
dc.subjectMODEL
dc.subjectMAPS
dc.titleEvolution of dust extinction and supernova cosmologyen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeSubmitted Version
dcterms.dateAccepted1999-12-01
rioxxterms.versionSMUR
rioxxterms.versionofrecordhttps://doi.org/10.1086/312377
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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