An Ultraviolet-to-Radio Broadband Spectral Atlas of Nearby Galaxies
| Autor: | D. A. Dale, A. Gil de Paz, K. D. Gordon, H. M. Hanson, L. Armus, G. J. Bendo, L. Bianchi, M. Block, S. Boissier, A. Boselli, B. A. Buckalew, V. Buat, D. Burgarella, D. Calzetti, J. M. Cannon, C. W. Engelbracht, G. Helou, D. J. Hollenbach, T. H. Jarrett, R. C. Kennicutt, C. Leitherer, A. Li, B. F. Madore, D. C. Martin, M. J. Meyer, E. J. Murphy, M. W. Regan, H. Roussel, J. D. T. Smith, M. L. Sosey, D. A. Thilker, F. Walter |
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| Přispěvatelé: | Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Beaussier, Catherine, Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES) |
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
Astrofísica
010504 meteorology & atmospheric sciences FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics medicine.disease_cause 01 natural sciences [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] 0103 physical sciences Spectral slope medicine Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Physics Spiral galaxy Star formation Astrophysics (astro-ph) Spectral density Astronomy and Astrophysics Galaxy Astronomía [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] Space and Planetary Science Spectral atlas Astrophysics::Earth and Planetary Astrophysics Irregular galaxy Ultraviolet |
| Zdroj: | E-Prints Complutense. Archivo Institucional de la UCM instname E-Prints Complutense: Archivo Institucional de la UCM Universidad Complutense de Madrid |
| Popis: | The ultraviolet-to-radio continuum spectral energy distributions are presented for all 75 galaxies in the Spitzer Infrared Nearby Galaxies Survey (SINGS). A principal component analysis of the sample shows that most of the sample's spectral variations stem from two underlying components, one representative of a galaxy with a low infrared-to-ultraviolet ratio and one representative of a galaxy with a high infrared-to-ultraviolet ratio. The influence of several parameters on the infrared-to-ultraviolet ratio is studied (e.g., optical morphology, disk inclination, far-infrared color, ultraviolet spectral slope, and star formation history). Consistent with our understanding of normal star-forming galaxies, the SINGS sample of galaxies in comparison to more actively star-forming galaxies exhibits a larger dispersion in the infrared-to-ultraviolet versus ultraviolet spectral slope correlation. Early type galaxies, exhibiting low star formation rates and high optical surface brightnesses, have the most discrepant infrared-to-ultraviolet correlation. These results suggest that the star formation history may be the dominant regulator of the broadband spectral variations between galaxies. Finally, a new discovery shows that the 24 micron morphology can be a useful tool for parametrizing the global dust temperature and ultraviolet extinction in nearby galaxies. The dust emission in dwarf/irregular galaxies is clumpy and warm accompanied by low ultraviolet extinction, while in spiral galaxies there is typically a much larger diffuse component of cooler dust and average ultraviolet extinction. For galaxies with nuclear 24 micron emission, the dust temperature and ultraviolet extinction are relatively high compared to disk galaxies. Comment: Accepted for publication in the Astrophysical Journal; Fixed radio flux density units (mJy) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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