Star-formation histories of local luminous infrared galaxies
Entity
UAM. Departamento de Física TeóricaPublisher
EDP SciencesDate
2015-05-01Citation
10.1051/0004-6361/201425359
Astronomy and Astrophysics 577 (2015): A78
ISSN
0004-6361 (print); 1432-0746 (online)DOI
10.1051/0004-6361/201425359Funded by
We acknowledge support from the Spanish Plan Nacional de Astronomía y Astrofísica through grants AYA2010-21161-C02-1, AYA2010-21887-C04-03, AYA2012-32295, AYA2012-31447, AYA2012-31277, and AYA2012-39408-C02-01Project
Gobierno de España. AYA2010- 21161-C02-1; Gobierno de España. AYA2010-21887-C04-03; Gobierno de España. AYA2012-32295; Gobierno de España. AYA2012-31447; Gobierno de España. AYA2012-31277; Gobierno de España. AYA2012-39408-C02-01Editor's Version
http://dx.doi.org/10.1051/0004-6361/201425359Subjects
Galaxies: evolution; Galaxies: star formation; Galaxies: starburst; FísicaNote
Astronomy and Astrophysics 577 (2015): A78 reproduced with permission from Astronomy & Astrophysics, © ESORights
© ESO, 2015Abstract
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 1011 Lₒ and 1011.8 Lₒ. 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 Mₒ. 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 diagram that can be used to identify objects with rapidly changing (increasing or decreasing) SFR during the past 100 Myr
Files in this item
Google Scholar:Pereira-Santaella, Miguel
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Alonso-Herrero, Almudena
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Colina, Luis
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Miralles-Caballero, Daniel
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Pérez-González, Pablo G.
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Arribas, Santiago
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Bellocchi, Enrica
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Cazzoli, Sara
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Díaz-Santos, Tanio
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López, Javier Piqueras
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