Sandstrom, K. and Appleton, P. and Armus, L. and Beirão, P. and Helou, G. and Murphy, E. J. (2010) Mapping far-IR emission from the central kiloparsec of NGC 1097. Astronomy and Astrophysics, 518 . L59. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20101122-112011285
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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.
|Additional Information:||© 2010 ESO. Received 30 March 2010; Accepted 29 April 2010; Published online 16 July 2010. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. The authors thank R. Beck for the radio continuum data and P.-Y. Hsieh for the CO data. K.S. would like to thank G. van de Ven and L. Burtscher for useful discussions. PACS has been developed by a consortium of institutes led by MPE (Germany) and including UVIE (Austria); KU Leuven, CSL, IMEC (Belgium); CEA, LAM (France); MPIA (Germany); INAF- IFSI/OAA/OAP/OAT, LENS, SISSA (Italy); IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESAPRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI/INAF (Italy), and CICYT/MCYT (Spain).|
|Subject Keywords:||infrared: galaxies; galaxies: star formation; galaxies: individual: NGC 1097; dust, extinction|
|Official Citation:||Mapping far-IR emission from the central kiloparsec of NGC 1097 K. Sandstrom, O. Krause, H. Linz, E. Schinnerer, G. Dumas, S. Meidt, H.-W. Rix, M. Sauvage, F. Walter, R. C. Kennicutt, D. Calzetti, P. Appleton, L. Armus, P. Beirão, A. Bolatto, B. Brandl, A. Crocker, K. Croxall, D. Dale, B. T. Draine, C. Engelbracht, A. Gil de Paz, K. Gordon, B. Groves, C.-N. Hao, G. Helou, J. Hinz, L. Hunt, B. D. Johnson, J. Koda, A. Leroy, E. J. Murphy, N. Rahman, H. Roussel, R. Skibba, J.-D. Smith, S. Srinivasan, L. Vigroux, B. E. Warren, C. D. Wilson, M. Wolfire and S. Zibetti A&A 518 L59 (2010) DOI: 10.1051/0004-6361/201014583|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||22 Nov 2010 23:32|
|Last Modified:||26 Dec 2012 12:40|
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