Advanced search
1 file | 528.61 KB Add to list

Mapping far-IR emission from the central kiloparsec of NGC 1097

Author
Organization
Abstract
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 similar to 900 pc. These observations are the first to resolve the structure of a circumnuclear ring at wavelengths that probe the peak (i.e. lambda similar to 100 mu m) 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 mu m, 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 similar to 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 similar to 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.
Keywords
SPECTRAL ENERGY-DISTRIBUTION, STAR-FORMATION, GALAXY NGC-1097, NUCLEAR, RINGS, NEARBY GALAXIES, SPIRAL GALAXIES, ACTIVE NUCLEUS, STARBURST, ULTRAVIOLET, TELESCOPE, infrared: galaxies, galaxies: star formation, galaxies: individual: NGC, 1097, dust, extinction

Downloads

  • Mapping far-IR emission from the central kiloparsec of NGC 1097.pdf
    • full text
    • |
    • open access
    • |
    • PDF
    • |
    • 528.61 KB

Citation

Please use this url to cite or link to this publication:

MLA
Sandstrom, K., et al. “Mapping Far-IR Emission from the Central Kiloparsec of NGC 1097.” ASTRONOMY & ASTROPHYSICS, vol. 518, 2010.
APA
Sandstrom, K., Krause, O., Linz, H., Schinnerer, E., Dumas, G., van der Wel, S. M., … Zibetti, S. (2010). Mapping far-IR emission from the central kiloparsec of NGC 1097. ASTRONOMY & ASTROPHYSICS, 518.
Chicago author-date
Sandstrom, K, O Krause, H Linz, E Schinnerer, G Dumas, Sharon Meidt van der Wel, H-W Rix, et al. 2010. “Mapping Far-IR Emission from the Central Kiloparsec of NGC 1097.” ASTRONOMY & ASTROPHYSICS 518.
Chicago author-date (all authors)
Sandstrom, K, O Krause, H Linz, E Schinnerer, G Dumas, Sharon Meidt van der Wel, H-W Rix, M Sauvage, F Walter, RC Kennicutt, D Calzetti, P Appleton, L Armus, P Beirao, A Bolatto, B Brandl, A Crocker, K Croxall, D Dale, BT Draine, C Engelbracht, A Gil de Paz, K Gordon, B Groves, C-N Hao, G Helou, J Hinz, L Hunt, BD Johnson, J Koda, A Leroy, EJ Murphy, N Rahman, H Roussel, R Skibba, J-D Smith, S Srinivasan, L Vigroux, BE Warren, CD Wilson, M Wolfire, and S Zibetti. 2010. “Mapping Far-IR Emission from the Central Kiloparsec of NGC 1097.” ASTRONOMY & ASTROPHYSICS 518.
Vancouver
1.
Sandstrom K, Krause O, Linz H, Schinnerer E, Dumas G, van der Wel SM, et al. Mapping far-IR emission from the central kiloparsec of NGC 1097. ASTRONOMY & ASTROPHYSICS. 2010;518.
IEEE
[1]
K. Sandstrom et al., “Mapping far-IR emission from the central kiloparsec of NGC 1097,” ASTRONOMY & ASTROPHYSICS, vol. 518, 2010.
@article{8622902,
  abstract     = {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 similar to 900 pc. These observations are the first to resolve the structure of a circumnuclear ring at wavelengths that probe the peak (i.e. lambda similar to 100 mu m) 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 mu m, 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 similar to 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 similar to 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.},
  articleno    = {L59},
  author       = {Sandstrom, K and Krause, O and Linz, H and Schinnerer, E and Dumas, G and van der Wel, Sharon Meidt and Rix, H-W and Sauvage, M and Walter, F and Kennicutt, RC and Calzetti, D and Appleton, P and Armus, L and Beirao, P and Bolatto, A and Brandl, B and Crocker, A and Croxall, K and Dale, D and Draine, BT and Engelbracht, C and Gil de Paz, A and Gordon, K and Groves, B and Hao, C-N and Helou, G and Hinz, J and Hunt, L and Johnson, BD and Koda, J and Leroy, A and Murphy, EJ and Rahman, N and Roussel, H and Skibba, R and Smith, J-D and Srinivasan, S and Vigroux, L and Warren, BE and Wilson, CD and Wolfire, M and Zibetti, S},
  issn         = {0004-6361},
  journal      = {ASTRONOMY & ASTROPHYSICS},
  keywords     = {SPECTRAL ENERGY-DISTRIBUTION,STAR-FORMATION,GALAXY NGC-1097,NUCLEAR,RINGS,NEARBY GALAXIES,SPIRAL GALAXIES,ACTIVE NUCLEUS,STARBURST,ULTRAVIOLET,TELESCOPE,infrared: galaxies,galaxies: star formation,galaxies: individual: NGC,1097,dust,extinction},
  language     = {eng},
  pages        = {5},
  title        = {Mapping far-IR emission from the central kiloparsec of NGC 1097},
  url          = {http://dx.doi.org/10.1051/0004-6361/201014583},
  volume       = {518},
  year         = {2010},
}

Altmetric
View in Altmetric
Web of Science
Times cited: