Spitzer space telescope measurements of dust reverberation lags in the Seyfert 1 galaxy NGC 6418
MetadataShow full item record
Altmetrics Handle Statistics
Altmetrics DOI Statistics
We 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.
Vazquez , 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 . https://doi.org/10.1088/0004-637X/801/2/127
© 2015. The American Astronomical Society. All rights reserved. Reproduced in accordance with AAS copyright policy.
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Showing items related by title, author, creator and subject.
SDSS-IV MaNGA: How the stellar populations of passive central galaxies depend on stellar and halo mass Oyarzún, Grecco A.; Bundy, Kevin; Westfall, Kyle B.; Tinker, Jeremy L.; Belfiore, Francesco; Argudo-Fernández, Maria; Zheng, Zheng; Conroy, Charlie; Masters, Karen L.; Wake, David; Law, David R.; McDermid, Richard M.; Aragón-Salamanca, Alfonso; Parikh, Taniya; Yan, Renbin; Bershady, Matthew; Sánchez, Sebastián F.; Andrews, Brett H.; Fernández-Trincado, José G.; Lane, Richard R.; Bizyaev, D.; Boardman, Nicholas Fraser; Lacerna, Ivan; Brownstein, J. R.; Drory, Niv; Zhang, Kai (2022-07-06) - Journal articleWe analyze spatially resolved and co-added SDSS-IV MaNGA spectra with signal-to-noise ratio ∼100 from 2200 passive central galaxies (z ∼ 0.05) to understand how central galaxy assembly depends on stellar mass (M*) and halo ...
Mendez Abreu, Jairo; Debattista, V. P.; Corsini, E. M.; Aguerri, J. A. L. (2014-12) - Journal articleContext. Historically, galaxy bulges were thought to be single-component objects at the center of galaxies. However, this picture is now questioned since different bulge types with different formation paths, namely classical ...
Robotham, A. S. G.; Driver, S. P.; Davies, L. J. M.; Hopkins, A. M.; Baldry, I. K.; Agius, N. K.; Bauer, A. E.; Bland-Hawthorn, J.; Brough, S.; Brown, M. J. I.; Cluver, M.; De Propris, R.; Drinkwater, M. J.; Holwerda, B. W.; Kelvin, L. S.; Lara-Lopez, M. A.; Liske, J.; Lopez-Sanchez, A. R.; Loveday, J.; Mahajan, S.; McNaught-Roberts, T.; Moffett, A.; Norberg, P.; Obreschkow, D.; Owers, M. S.; Penny, S. J.; Pimbblet, K.; Prescott, M.; Taylor, E. N.; van Kampen, E.; Wilkins, S. M. (2014-11-11) - Journal articleWe use a highly complete subset of the Galaxy And Mass Assembly II (GAMA-II) redshift sample to fully describe the stellar mass dependence of close pairs and mergers between 10(8) and 10(12)M(circle dot). Using the analytic ...