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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559437.0, MPI für Astronomie / Publikationen_mpia
Mapping far-IR emission from the central kiloparsec of NGC 1097
Authors:Sandstrom, K.; Krause, O.; Linz, H.; Schinnerer, E.; Dumas, G.; Meidt, S.; Rix, H. W.; Sauvage, M.; Walter, F.; Kennicutt, R. C.; Calzetti, D.; Appleton, P.; Armus, L.; Beirão, P.; Bolatto, A.; Brandl, B.; Crocker, A.; Croxall, K.; Dale, D.; Draine, B. T.; Engelbracht, C.; Gil de Paz, A.; Gordon, K.; Groves, B.; Hao, C. N.; Helou, G.; Hinz, J.; Hunt, L.; Johnson, B. D.; Koda, J.; Leroy, A.; Murphy, E. J.; Rahman, N.; Roussel, H.; Skibba, R.; Smith, J. D.; Srinivasan, S.; Vigroux, L.; Warren, B. E.; Wilson, C. D.; Wolfire, M.; Zibetti, S.
Date of Publication (YYYY-MM-DD):2010
Journal Abbrev.:Astronomy and Astrophysics
Start Page:id.L59
Audience:Not Specified
Abstract / Description:Using photometry of NGC 1097 from the Herschel PACS (Photodetector Array Camera and Spectrometer) instrument, we study the resolved properties of thermal dust continuum emission from a circumnuclear starburst ring with a radius ~900 pc. These observations are the first to resolve the structure of a circumnuclear ring at wavelengths that probe the peak (i.e. λ ~ 100 μm) of the dust spectral energy distribution. The ring dominates the far-infrared (far-IR) emission from the galaxy - the high angular resolution of PACS allows us to isolate the ring's contribution and we find it is responsible for 75, 60 and 55% of the total flux of NGC 1097 at 70, 100 and 160 μm, respectively. We compare the far-IR structure of the ring to what is seen at other wavelengths and identify a sequence of far-IR bright knots that correspond to those seen in radio and mid-IR images. The mid- and far-IR band ratios in the ring vary by less than ±20% azimuthally, indicating modest variation in the radiation field heating the dust on ~600 pc scales. We explore various explanations for the azimuthal uniformity in the far-IR colors of the ring including a lack of well-defined age gradients in the young stellar cluster population, a dominant contribution to the far-IR emission from dust heated by older (>10 Myr) stars and/or a quick smoothing of local enhancements in dust temperature due to the short orbital period of the ring. Finally, we improve previous limits on the far-IR flux from the inner ~600 pc of NGC 1097 by an order of magnitude, providing a better estimate of the total bolometric emission arising from the active galactic nucleus and its associated central starburst. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
Free Keywords:infrared: galaxies; galaxies: star formation; galaxies: individual: NGC 1097; dust; extinction
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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