Please use this identifier to cite or link to this item: http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/2040
The source counts of submillimetre galaxies detected at λ = 1.1 mm
Itziar Aretxaga
David Hughes
Alfredo Montaña Barbano
Acceso Abierto
Atribución-NoComercial-SinDerivadas
Galaxies: evolution
Galaxies: high-redshift
Galaxies: starburst
Submillimetre: galaxies
The source counts of galaxies discovered at submillimetre and millimetre wavelengths provideimportant information on the evolution of infrared-bright galaxies. We combine the data fromsix blank-field surveys carried out at 1.1 mm with AzTEC, totalling 1.6 deg² in area with root-mean-square depths ranging from 0.4 to 1.7 mJy, and derive the strongest constraints to date on the 1.1 mm source counts at flux densities S₁₁₀₀ = 1–12 mJy. Using additional data from the AzTEC Cluster Environment Survey to extend the counts to S₁₁₀₀ ~ 20 mJy, we see tentative evidence for an enhancement relative to the exponential drop in the The source counts of galaxies discovered at submillimetre and millimetre wavelengths provideimportant information on the evolution of infrared-bright galaxies. We combine the data fromsix blank-field surveys carried out at 1.1 mm with AzTEC, totalling 1.6 deg² in area with root-mean-square depths ranging from 0.4 to 1.7 mJy, and derive the strongest constraints to date on the 1.1 mm source counts at flux densities S₁₁₀₀ = 1–12 mJy. Using additional data from the AzTEC Cluster Environment Survey to extend the counts to S₁₁₀₀ ~ 20 mJy, we see tentative evidence for an enhancement relative to the exponential drop in the counts at S₁₁₀₀ ~ 13 mJy and a smooth connection to the bright source counts at >20 mJy measured by the South Pole Telescope; this excess may be due to strong-lensing effects. We compare these counts to predictions from several semi-analytical and phenomenological models and find that for most the agreement is quite good at flux densities ≳4 mJy; however, we find significant discrepancies (≳3σ) between the models and the observed 1.1-mm counts at lower flux densities, and none of them is consistent with the observed turnover in the Euclideannormalized counts at S₁₁₀₀ ≲ 2mJy. Our new results therefore may require modifications to existing evolutionary models for low-luminosity galaxies. Alternatively, the discrepancy between the measured counts at the faint end and predictions from phenomenological models could arise from limited knowledge of the spectral energy distributions of faint galaxies in the local Universe.
Monthly notices of the royal astronomical society
2012-06
Artículo
Inglés
Estudiantes
Investigadores
Público en general
Scott, K. S., et al., (2012), The source counts of submillimetre galaxies detected at λ = 1.1 mm, Monthly notices of the royal astronomical society, Vol. 423(1):575-589
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Appears in Collections:Artículos de Astrofísica

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