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AzTEC millimetre survey of the COSMOS field – II. Source count overdensity and correlations with large-scale structure
ITZIAR ARETXAGA MENDEZ
David Hughes
Acceso Abierto
Atribución-NoComercial-SinDerivadas
Gravitational lensing
Surveys
Galaxies: evolution
Cosmology: miscellaneous
Infrared: galaxies
Submillimeter
We report an overdensity of bright submillimetre galaxies (SMGs) in the 0.15 deg² AzTEC/COSMOS survey and a spatial correlation between the SMGs and the optical-IR galaxy density at z ≲ 1.1. This portion of the COSMOS field shows a ∼3σ overdensity of robust SMG detections when compared to a background, or ‘blank-field’, population model that is consistent with SMG surveys of fields with no extragalactic bias. The SMG overdensity is most significant in the number of very bright detections (14 sources with measured fluxes S₁․₁ₘₘ > 6 mJy), which is entirely incompatible with sample variance within our adopted blank-field number densities and infers an overdensity significance of ≫ 4σ. We find that the overdensity and spatial correlation to optical-IR galaxy density are most consistent with lensing of a background SMG population by foreground mass structures along the line of sight, rather than physical association of the SMGs with the z ≲ 1.1 galaxies/clusters. The SMG positions are only weakly correlated with weak-lensing maps, suggesting that the dominant sources of correlation are individual galaxies and the more tenuous structures in the survey region, and not the massive and compact clusters. These results highlight the important roles cosmic variance and large-scale structure can play in the study of SMGs.
Monthly Notices of the Royal Astronomical Society
2009
Artículo
Inglés
Estudiantes
Investigadores
Público en general
Austermann, J. E., et al., (2009). AzTEC millimetre survey of the COSMOS field – II. Source count overdensity and correlations with large-scale structure, Monthly Notices of the Royal Astronomical Society, Vol.393(4):1573–1583
ASTRONOMÍA Y ASTROFÍSICA
Versión aceptada
acceptedVersion - Versión aceptada
Appears in Collections:Artículos de Astrofísica

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