Astronomy and Astrophysics, volume 577A, 78-78 (2015/5-1)
Star-formation histories of local luminous infrared galaxies.
PEREIRA-SANTAELLA M., ALONSO-HERRERO A., COLINA L., MIRALLES-CABALLERO D., PEREZ-GONZALEZ P.G., ARRIBAS S., BELLOCCHI E., CAZZOLI S., DIAZ-SANTOS T. and PIQUERAS LOPEZ J.
Abstract (from CDS):
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 + [NII] 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 ∼1Gyr 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 ∼1Gyr ago with stellar masses between 1010.1 and 1011.5M☉. We also derived the average extinction (Av=0.6-3mag) 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 100Myr.
galaxies: evolution - galaxies: starburst - galaxies: star formation
CGCG 468-002 NED02 is 2MASX J05082121+1722083 in SIMBAD.
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