RT Journal Article
T1 Mapping far-IR emission from the central kiloparsec of NGC 1097
A1 Gil De Paz, Armando
AB 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.
PB EDP Sciencies
SN 0004-6361
YR 2010
FD 2010-07
LK https://hdl.handle.net/20.500.14352/44893
UL https://hdl.handle.net/20.500.14352/44893
LA eng
NO © ESO, 2010. Artículo firmado por 42 autores. 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), ESA-PRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI/INAF (Italy), and CICYT/MCYT (Spain).
NO BMVIT (Austria)
NO ESA-PRODEX (Belgium)
NO CEA (France)
NO DLR (Germany)
NO ASI (Italy)
NO Ministerio de Ciencia y Tecnología (MCYT), España
NO CNES (France)
NO INAF (Italy)
NO Comisión Interminnisterial de Ciencia y Tecnología (CICYT), España
DS Docta Complutense
RD 11 abr 2025