Interstellar extinction curve variations towards the inner Milky Way: A challenge to observational cosmology

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dc.contributor.authorNataf, David M.
dc.contributor.authorGonzalez, Oscar A.
dc.contributor.authorCasagrande, Luca
dc.contributor.authorZasowski, Gail
dc.contributor.authorWegg, Christopher
dc.contributor.authorWolf, Christian
dc.contributor.authorKunder, Andrea
dc.contributor.authorAlonso-Garcia, Javier
dc.contributor.authorMinniti, Dante
dc.contributor.authorRejkuba, Marina
dc.contributor.authorSaito, Roberto K.
dc.contributor.authorValenti, Elena
dc.contributor.authorZoccali, Manuela
dc.contributor.authorPoleski, Radosław
dc.contributor.authorPietrzyński, Grzegorz
dc.contributor.authorSkowron, Jan
dc.contributor.authorSoszyński, Igor
dc.contributor.authorSzymański, Michał K.
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorUlaczyk, Krzyszto
dc.contributor.authorWyrzykowski, Łukasz
dc.date.accessioned2023-11-10T15:20:39Z
dc.date.available2023-11-10T15:20:39Z
dc.date.issued2016-03
dc.descriptionIndexación: Scopus.es
dc.description.abstractWe investigate interstellar extinction curve variations towards ∼4 deg2 of the inner Milky Way in VIJKs photometry from the OGLE-III (third phase of the Optical Gravitational Lensing Experiment) and VVV (VISTA Variables in the Via Lactea) surveys, with supporting evidence from diffuse interstellar bands and F435W, F625W photometry. We obtain independent mea surements towards ∼2000 sightlines of AI, E(V − I), E(I − J) and E(J − Ks), with median precision and accuracy of 2 per cent. We find that the variations in the extinction ratios AI/E(V − I), E(I − J)/E(V − I) and E(J − Ks)/E(V − I) are large (exceeding 20 per cent), signifi cant and positively correlated, as expected. However, both the mean values and the trends in these extinction ratios are drastically shifted from the predictions of Cardelli and Fitzpatrick, regardless of how RV is varied. Furthermore, we demonstrate that variations in the shape of the extinction curve have at least two degrees of freedom, and not one (e.g. RV), which we confirm with a principal component analysis. We derive a median value of AV/AKs = 13.44, which is ∼60 per cent higher than the ‘standard’ value. We show that the Wesenheit magnitude WI = I − 1.61(I − J) is relatively impervious to extinction curve variations. Given that these extinction curves are linchpins of observational cosmology, and that it is generally assumed that RV variations correctly capture variations in the extinction curve, we argue that systematic errors in the distance ladder from studies of Type Ia supernovae and Cepheids may have been underestimated. Moreover, the reddening maps from the Planck experiment are shown to systematically overestimate dust extinction by ∼100 per cent and lack sensitivity to extinction curve variations.es
dc.description.urihttps://academic.oup.com/mnras/article/456/3/2692/1099672?login=true
dc.identifier.citationMonthly Notices of the Royal Astronomical Society. Volume 456, Issue 3, Pages 2692 - 2706. 1 March 2016es
dc.identifier.doi10.1093/mnras/stv2843
dc.identifier.issn0035-8711
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/53894
dc.language.isoenes
dc.publisherOxford University Presses
dc.subjectDustes
dc.subjectExtinctiones
dc.subjectISM: Lines and Bandses
dc.titleInterstellar extinction curve variations towards the inner Milky Way: A challenge to observational cosmologyes
dc.typeArtículoes
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