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SHARDS: A global view of the star formation activity at z∼ 0.84 and z∼ 1.23

AuthorsCava, Antonio; Pérez-González, Pablo G.; Alonso-Herrero, A. ; Cenarro, A. J.; Domínguez-Sánchez, H.; Esquej, Pilar ; Gallego, Jesús; Hernán-Caballero, Antonio ; Huertas-Company, M.; Rodríguez-Espinosa, J. M.; Villar, Víctor
KeywordsGalaxies: photometry
Quasars: emission lines
Galaxies: star formation
Galaxies: high-redshift
Galaxies: general
Galaxies: evolution
Issue Date2015
CitationAstrophysical Journal 812(2): 155 (2015)
AbstractIn this paper, we present a comprehensive analysis of star-forming galaxies (SFGs) at intermediate redshifts (z ∼ 1). We combine the ultra-deep optical spectro-photometric data from the Survey for High-z Absorption Red and Dead Sources (SHARDS) with deep UV-to-FIR observations in the GOODS-N field. Exploiting two of the 25 SHARDS medium-band filters, F687W17 and F823W17, we select [O ii] emission line galaxies at z ∼ 0.84 and z ∼ 1.23 and characterize their physical properties. Their rest-frame equivalent widths (EW([O ii])), line fluxes, luminosities, star formation rates (SFRs), and dust attenuation properties are investigated. The evolution of EW([O ii]) closely follows the SFR density evolution of the universe, with a trend of EW([O ii]) (1 + z) up to redshift z ≃ 1, followed by a possible flattening. The SF properties of the galaxies selected on the basis of their [O ii] emission are compared with complementary samples of SFGs selected by their MIR and FIR emission, and also with a general mass-selected sample of galaxies at the same redshifts. We demonstrate observationally that the UVJ diagram (or, similarly, a cut in the specific SFR) is only partially able to distinguish the quiescent galaxies from the SFGs. The SFR-M relation is investigated for the different samples, yielding a logarithmic slope ∼1, in good agreement with previous results. The dust attenuations derived from different SFR indicators (UV(1600), UV(2800), [O ii], IR) are compared and show clear trends with respect to both the stellar mass and total SFR, with more massive and highly star-forming galaxies being affected by stronger dust attenuation.
Descriptionet al.
Publisher version (URL)http://dx.doi.org/10.1088/0004-637X/812/2/155
Identifiersdoi: 10.1088/0004-637X/812/2/155
e-issn: 1538-4357
issn: 0004-637X
Appears in Collections:(IFCA) Artículos
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