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A detailed dust energy balance study of the Sombrero galaxy

Ilse De Looze (UGent) , Maarten Baes (UGent) , Jacopo Fritz (UGent) , Gianfranco Gentile (UGent) and Joris Verstappen (UGent)
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Abstract
The Sombrero galaxy (M104) is an interesting object for a dust energy balance study due to its very symmetric dust lane, its proximity and its (nearly edge-on) inclination of 84 degrees. From a. panchromatic radiative transfer analysis, including scattering, absorption and thermal dust re-emission, we construct a standard model for M104 accounting for observations in the optical wave bands (stellar SED, images and extinction profiles in the V and R-C band). This standard model underestimates the observed dust emission at infrared wavelengths by a factor of similar to 3, similar to the discrepancy found in other energy balance studies of edge-on spirals. Supplementing this standard model with a young stellar component of low star formation activity in both the inner disk (SFR similar to 0.21 M-circle dot yr(-1)) and dust ring (SFR similar to 0.05 M-circle dot yr(-1)), we are capable of solving the discrepancy in the dust energy budget of the Sombrero galaxy at wavelengths shortwards of 100 mu m. To account for the remaining discrepancy at longer wavelengths, we propose a secondary dust component distributed in quiescent clumps. This model with a clumpy dust structure predicts three-quarters of the total dust content to reside in compact dust clouds with no associated embedded sources.
Keywords
ISM: dust, radiative transfer, extinction, galaxies: M104, EVOLUTIONARY POPULATION SYNTHESIS, RADIATIVE-TRANSFER, NEARBY GALAXIES, SPIRAL GALAXIES, STAR-FORMATION, EMISSIVITY, NGC-4594, MODELS, ATLAS, DISK

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MLA
De Looze, Ilse, Maarten Baes, Jacopo Fritz, et al. “A Detailed Dust Energy Balance Study of the Sombrero Galaxy.” IAU Symposium Proceedings Series. Ed. RJ Tuffs & CC Popescu. Vol. 284. Cambridge, UK: Cambridge University Press, 2012. 92–96. Print.
APA
De Looze, Ilse, Baes, M., Fritz, J., Gentile, G., & Verstappen, J. (2012). A detailed dust energy balance study of the Sombrero galaxy. In R. Tuffs & C. Popescu (Eds.), IAU Symposium Proceedings Series (Vol. 284, pp. 92–96). Presented at the 284th Symposium of the International Astronomical Union, Cambridge, UK: Cambridge University Press.
Chicago author-date
De Looze, Ilse, Maarten Baes, Jacopo Fritz, Gianfranco Gentile, and Joris Verstappen. 2012. “A Detailed Dust Energy Balance Study of the Sombrero Galaxy.” In IAU Symposium Proceedings Series, ed. RJ Tuffs and CC Popescu, 284:92–96. Cambridge, UK: Cambridge University Press.
Chicago author-date (all authors)
De Looze, Ilse, Maarten Baes, Jacopo Fritz, Gianfranco Gentile, and Joris Verstappen. 2012. “A Detailed Dust Energy Balance Study of the Sombrero Galaxy.” In IAU Symposium Proceedings Series, ed. RJ Tuffs and CC Popescu, 284:92–96. Cambridge, UK: Cambridge University Press.
Vancouver
1.
De Looze I, Baes M, Fritz J, Gentile G, Verstappen J. A detailed dust energy balance study of the Sombrero galaxy. In: Tuffs R, Popescu C, editors. IAU Symposium Proceedings Series. Cambridge, UK: Cambridge University Press; 2012. p. 92–6.
IEEE
[1]
I. De Looze, M. Baes, J. Fritz, G. Gentile, and J. Verstappen, “A detailed dust energy balance study of the Sombrero galaxy,” in IAU Symposium Proceedings Series, Preston, UK, 2012, vol. 284, pp. 92–96.
@inproceedings{3097858,
  abstract     = {The Sombrero galaxy (M104) is an interesting object for a dust energy balance study due to its very symmetric dust lane, its proximity and its (nearly edge-on) inclination of 84 degrees. From a. panchromatic radiative transfer analysis, including scattering, absorption and thermal dust re-emission, we construct a standard model for M104 accounting for observations in the optical wave bands (stellar SED, images and extinction profiles in the V and R-C band). This standard model underestimates the observed dust emission at infrared wavelengths by a factor of similar to 3, similar to the discrepancy found in other energy balance studies of edge-on spirals. Supplementing this standard model with a young stellar component of low star formation activity in both the inner disk (SFR similar to 0.21 M-circle dot yr(-1)) and dust ring (SFR similar to 0.05 M-circle dot yr(-1)), we are capable of solving the discrepancy in the dust energy budget of the Sombrero galaxy at wavelengths shortwards of 100 mu m. To account for the remaining discrepancy at longer wavelengths, we propose a secondary dust component distributed in quiescent clumps. This model with a clumpy dust structure predicts three-quarters of the total dust content to reside in compact dust clouds with no associated embedded sources.},
  author       = {De Looze, Ilse and Baes, Maarten and Fritz, Jacopo and Gentile, Gianfranco and Verstappen, Joris},
  booktitle    = {IAU Symposium Proceedings Series},
  editor       = {Tuffs, RJ and Popescu, CC},
  isbn         = {9781107019843},
  issn         = {1743-9213},
  keywords     = {ISM: dust,radiative transfer,extinction,galaxies: M104,EVOLUTIONARY POPULATION SYNTHESIS,RADIATIVE-TRANSFER,NEARBY GALAXIES,SPIRAL GALAXIES,STAR-FORMATION,EMISSIVITY,NGC-4594,MODELS,ATLAS,DISK},
  language     = {eng},
  location     = {Preston, UK},
  pages        = {92--96},
  publisher    = {Cambridge University Press},
  title        = {A detailed dust energy balance study of the Sombrero galaxy},
  url          = {http://dx.doi.org/10.1017/S1743921312008800},
  volume       = {284},
  year         = {2012},
}

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