HERschel Observations of Edge-on Spirals (HEROES). IV. Dust energy balance problem
| Autor: | Fraser Lewis, Simone Bianchi, Joris Verstappen, Peter Camps, Jacopo Fritz, Gert De Geyter, S. Verstocken, Aleksandr V. Mosenkov, F. Allaert, Christopher J. R. Clark, Matthew Smith, Ilse De Looze, Marjorie Decleir, Gianfranco Gentile, Benne W. Holwerda, T. M. Hughes, Maarten Baes, Sébastien Viaene |
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| Přispěvatelé: | Astronomy |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
ACTIVE GALACTIC NUCLEI
Active galactic nucleus 010504 meteorology & atmospheric sciences Stellar population Extinction (astronomy) FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics SURFACE PHOTOMETRY 01 natural sciences RADIATIVE-TRANSFER CODE Bulge GRAND-DESIGN 0103 physical sciences fundamental parameters [galaxies] Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics SHAPED BULGES 0105 earth and related environmental sciences Cosmic dust Luminosity function (astronomy) Physics infrared: ISM Spiral galaxy ISM [galaxies] extinction SPITZER SURVEY ISM [infrared] Astronomy and Astrophysics galaxies: fundamental parameters Astrophysics - Astrophysics of Galaxies Galaxy STELLAR DISKS Physics and Astronomy LUMINOSITY FUNCTION Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics dust SKY SURVEY INTERSTELLAR DUST galaxies: ISM |
| Zdroj: | Astronomy & astrophysics, 616. EDP Sciences ASTRONOMY & ASTROPHYSICS |
| ISSN: | 0004-6361 1432-0746 |
| Popis: | We present results of the detailed dust energy balance study for the seven large edge-on galaxies in the HEROES sample using 3D radiative transfer (RT) modelling. Based on available optical and near-infrared observations of the HEROES galaxies, we derive the 3D distribution of stars and dust in these galaxies. For the sake of uniformity, we apply the same technique to retrieve galaxy properties for the entire sample: we use a stellar model consisting of a S\'ersic bulge and three double-exponential discs (a superthin disc for a young stellar population and thin and thick discs for old populations). For the dust component, we adopt a double-exponential disc with the new THEMIS dust-grain model. We fit oligochromatic radiative transfer (RT) models to the optical and near-infrared images with the fitting algorithm FitSKIRT and do panchromatic simulations with the SKIRT code at wavelengths ranging from ultraviolet to submillimeter. We confirm the previously stated dust energy balance problem in galaxies: for the HEROES galaxies, the dust emission derived from our RT calculations underestimates the real observations by a factor 1.5-4 for all galaxies except NGC 973 and NGC 5907 (apparently, the latter galaxy has a more complex geometry than we used). The comparison between our RT simulations and the observations at mid-infrared-submillimeter wavelengths shows that most of our galaxies exhibit complex dust morphologies (possible spiral arms, star-forming regions, more extended dust structure in the radial and vertical directions). We suggest that, in agreement with the results from Saftly et al. (2015), the large- and small-scale structure is the most probable explanation for the dust energy balance problem. Comment: 53 pages, 31 figures, Accepted for publication in Astronomy & Astrophysics |
| Databáze: | OpenAIRE |
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