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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448076.0, MPI für Astronomie / Publikationen_mpia
Dust emission from a parsec-scale structure in the Seyfert 1 nucleus of NGC 4151
Authors:Burtscher, L.; Jaffe, W.; Raban, D.; Meisenheimer, K.; Tristram, K. R. W.; Röttgering, H.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Start Page:L53
End Page:L57
Review Status:not specified
Audience:Experts Only
Abstract / Description:We report mid-infrared interferometric measurements (based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere, Chile, programme number 081.B-0092(A)) with ~10 mas resolution, which resolve the warm (T = 285+25 -50 K) thermal emission at the center of NGC 4151. Using pairs of Very Large Telescope 8.2 m telescopes with the Mid-infrared interferometric instrument and by comparing the data to a Gaussian model, we determined the diameter of the dust emission region, albeit only along one position angle, to be (2.0 ± 0.4) pc (FWHM). This is the first size and temperature estimate for the nuclear warm dust distribution in a Seyfert 1 galaxy. The parameters found are comparable to those in Seyfert 2 galaxies, thus providing direct support for the unified model. Using simple analytic temperature distributions, we find that the mid-infrared emission is probably not the smooth continuation of the hot nuclear source that is marginally resolved with K-band interferometry. We also detected weak excess emission around 10.5 mum in our shorter baseline observation, possibly indicating that silicate emission is extended to the parsec scale.
Free Keywords:galaxies: active; galaxies: Seyfert; techniques: high angular resolution
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009ApJ...705L..53B [ID No:1]
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