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dc.contributor.authorVazquez, B.
dc.contributor.authorGrant, Pasquale
dc.contributor.authorRichmond, M.
dc.contributor.authorRobinson, A.
dc.contributor.authorAxon, D.J.
dc.contributor.authorHorne, K.
dc.contributor.authorAlmeyda, T.
dc.contributor.authorFausnaugh, M.
dc.contributor.authorPeterson, B.M.
dc.contributor.authorBottorff, M.
dc.contributor.authorGallimore, J.
dc.contributor.authorEltizur, M.
dc.contributor.authorNetzer, H.
dc.contributor.authorStorchi-Bergmann, T.
dc.contributor.authorMarconi, A.
dc.contributor.authorCapetti, A.
dc.contributor.authorBatcheldor, D.
dc.contributor.authorBuchanan, C.
dc.contributor.authorStirpe, G.
dc.contributor.authorKishimoto, M.
dc.contributor.authorPackham, C.
dc.contributor.authorPerez, E.
dc.contributor.authorTadhunter, C.
dc.contributor.authorUpton, J.
dc.contributor.authorEstrada-Carpenter, V.
dc.identifier.citationVazquez , B , Grant , P , Richmond , M , Robinson , A , Axon , D J , Horne , K , Almeyda , T , Fausnaugh , M , Peterson , B M , Bottorff , M , Gallimore , J , Eltizur , M , Netzer , H , Storchi-Bergmann , T , Marconi , A , Capetti , A , Batcheldor , D , Buchanan , C , Stirpe , G , Kishimoto , M , Packham , C , Perez , E , Tadhunter , C , Upton , J & Estrada-Carpenter , V 2015 , ' Spitzer space telescope measurements of dust reverberation lags in the Seyfert 1 galaxy NGC 6418 ' , Astrophysical Journal , vol. 801 , no. 2 .
dc.identifier.otherPURE: 176898187
dc.identifier.otherPURE UUID: 51746f24-0b2c-4832-bef5-30559e245ca5
dc.identifier.otherScopus: 84924663118
dc.identifier.otherWOS: 000350965500056
dc.description.abstractWe present results from a 15 month campaign of high-cadence (∼3 days) mid-infrared Spitzer and optical (B and V) monitoring of the Seyfert 1 galaxy NGC 6418, with the objective of determining the characteristic size of the dusty torus in this active galactic nucleus (AGN). We find that the 3.6 and 4.5 μm flux variations lag behind those of the optical continuum by days and days, respectively. We report a cross-correlation time lag between the 4.5 and 3.6 μm flux of days. The lags indicate that the dust emitting at 3.6 and 4.5 μm is located at a distance light-month () from the source of the AGN UV-optical continuum. The reverberation radii are consistent with the inferred lower limit to the sublimation radius for pure graphite grains at 1800 K, but smaller by a factor of ∼2 than the corresponding lower limit for silicate grains; this is similar to what has been found for near-infrared (K-band) lags in other AGNs. The 3.6 and 4.5 μm reverberation radii fall above the K-band size-luminosity relationship by factors and , respectively, while the 4.5 μm reverberation radius is only 27% larger than the 3.6 μm radius. This is broadly consistent with clumpy torus models, in which individual optically thick clouds emit strongly over a broad wavelength range.
dc.relation.ispartofAstrophysical Journalen
dc.rights© 2015. The American Astronomical Society. All rights reserved. Reproduced in accordance with AAS copyright policy.en
dc.subjectGalaxies: activeen
dc.subjectGalaxies: individual (NGC 6418)en
dc.subjectGalaxies: nucleien
dc.subjectGalaxies: Seyferten
dc.subjectQC Physicsen
dc.titleSpitzer space telescope measurements of dust reverberation lags in the Seyfert 1 galaxy NGC 6418en
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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