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Lyman break and ultraviolet-selected galaxies at z ∼ 1 - I. Stellar populations from the ALHAMBRA survey

AuthorsOteo Gómez, Iván; Bongiovanni, Ángel; Cepa, Jordi; Pérez-García, Ana M.; Ederoclite, A.; Sánchez-Portal, Miguel; Pintos-Castro, Irene; Pérez-Martínez, Ricardo; Polednikova, Jana; Aguerri, J.A.L.; Alfaro, Emilio J. CSIC ORCID ; Aparicio Villegas, Teresa CSIC; Benítez, Narciso CSIC ORCID; Broadhurst, T.; Cabrera-Caño, Jesús; Castander, Francisco J. CSIC ORCID; Cerviño, Miguel CSIC ORCID CVN ; Cristóbal-Hornillos, David CSIC; Fernández-Soto, Alberto CSIC ORCID ; González Delgado, Rosa M. CSIC ORCID ; Husillos, César CSIC ORCID; Infante, Leopoldo; Martínez, Vicente J.; Márquez, Isabel CSIC ORCID; Masegosa, Josefa CSIC ORCID; Matute, Israel; Moles, Mariano CSIC; Molino, Alberto CSIC ORCID; Olmo, Ascensión del CSIC ORCID; Perea, Jaime CSIC ORCID; Pović, Mirjana; Prada, Francisco CSIC ORCID ; Quintana, José María CSIC; Viironen, Kerttu
KeywordsUltraviolet: galaxies
Cosmology: observations
Galaxies: star formation
Galaxies: high-redshift
Galaxies: photometry
Galaxies: evolution
Issue Date2013
PublisherOxford University Press
Royal Astronomical Society
CitationMonthly Notices of the Royal Astronomical Society 433(4): 2706-2726 (2013)
AbstractWe take advantage of the exceptional photometric coverage provided by the combination of GALEX data in the ultraviolet (UV) and the ALHAMBRA survey in the optical and near-infrared to analyse the physical properties of a sample of 1225 GALEX-selected Lyman break galaxies (LBGs) at 0.8 ≲ z ≲ 1.2 that are located in the COSMOS field. This is the largest sample of LBGs studied in this redshift range to date. According to a spectral energy distribution (SED) fitting with synthetic stellar population templates, we find that LBGs at z ̃ 1 are mostly young galaxies with a median age of 341 Myr and have intermediate dust attenuation, (Es(B - V)) ̃ 0.20. Owing to the selection criterion, LBGs at z ̃ 1 are UV-bright galaxies and have a high dust-corrected total star formation rate (SFR), with a median value of 16.9M⊙ yr-1. Their median stellar mass is log (M*/M⊙) = 9.74. We find that the dustcorrected total SFR of LBGs increases with stellar mass and that the specific SFR is lower for more massive galaxies (downsizing scenario). Only 2 per cent of the galaxies selected through the Lyman break criterion have an active galactic nucleus nature. LBGs at z ̃ 1 are located mostly over the blue cloud of the colour-magnitude diagram of galaxies at their redshift, with only the oldest and/or the dustiest deviating towards the green valley and red sequence. Morphologically, 69 per cent of LBGs are disc-like galaxies, with the fractions of interacting, compact, or irregular systems being much lower, below 12 per cent. LBGs have a median effective radius of 2.5 kpc, and larger galaxies have a higher total SFR and stellar mass. Compared with their high-redshift analogues, we find evidence that LBGs at lower redshifts are larger, redder in the UV continuum, and have a major presence of older stellar populations in their SEDs. However, we do not find significant differences in the distributions of stellar mass or dust attenuation. ©2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Publisher version (URL)http://dx.doi.org/10.1093/mnras/stt835
Identifiersdoi: 10.1093/mnras/stt835
issn: 0035-8711
e-issn: 1365-2966
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