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Título: | Star-formation histories of local luminous infrared galaxies |
Autor: | Pereira-Santaella, Miguel CSIC ORCID; Alonso-Herrero, A. CSIC ORCID; Colina, Luis CSIC ORCID; Miralles-Caballero, D. CSIC; Pérez-González, Pablo G. CSIC ORCID; Arribas-Mocoroa, Santiago CSIC ORCID ; Bellocchi, E.; Cazzoli, S.; Díaz-Santos, T. CSIC ORCID; Piqueras López, Javier CSIC ORCID | Palabras clave: | Galaxies: star formation Galaxies: evolution Galaxies: starburst |
Fecha de publicación: | 2015 | Editor: | EDP Sciences | Citación: | Astronomy and Astrophysics 577: A78 (2015) | Resumen: | We present analysis of the integrated spectral energy distribution (SED) from the ultraviolet (UV) to the far-infrared and Hα of a sample of 29 local systems and individual galaxies with infrared (IR) luminosities between 1011L⊙ and 1011.8L⊙. We combined new narrow-band Hα + [N ii] and broad-band g, r optical imaging taken with the Nordic Optical Telescope (NOT), with archival GALEX, 2MASS, Spitzer, and Herschel data. Their SEDs(photometry and integrated Hα flux) were fitted simultaneously with a modified version of the magphys code using stellar population synthesis models for the UV–near-IR range and thermal emission models for the IR emission taking the energy balance between the absorbed and re-emitted radiation into account. From the SED fits, we derive the star-formation histories (SFH) of these galaxies. For nearly half of them, the star-formation rate appears to be approximately constant during the last few Gyr. In the other half, the current star-formation rate seems to be enhanced by a factor of 3–20 with respect to what occurred ~1 Gyr ago. Objects with constant SFH tend to be more massive than starbursts, and they are compatible with the expected properties of a main-sequence (M-S) galaxy. Likewise, the derived SFHs show that all our objects were M-S galaxies ~1 Gyr ago with stellar masses between 1010.1 and 1011.5 M⊙. We also derived the average extinction (Av = 0.6−3 mag) and the polycyclic aromatic hydrocarbon luminosity to LIR ratio (0.03−0.16) from our fits. We combined the Av with the total IR and Hα luminosities into a diagramthat can be used to identify objects with rapidly changing (increasing or decreasing) SFR during the past 100 Myr. | Versión del editor: | http://dx.doi.org/10.1051/0004-6361/201425359 | URI: | http://hdl.handle.net/10261/140212 | DOI: | 10.1051/0004-6361/201425359 | Identificadores: | doi: 10.1051/0004-6361/201425359 e-issn: 1432-0746 issn: 0004-6361 |
Aparece en las colecciones: | (CAB) Artículos (IFCA) Artículos |
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Star-formation histories.pdf | 33,34 MB | Adobe PDF | Visualizar/Abrir |
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