AzTEC millimetre survey of the COSMOS field – II. Source count overdensity and correlations with large-scale structure

dc.creatorITZIAR ARETXAGA MENDEZ
dc.creatorDavid Hughes
dc.date2009
dc.date.accessioned2023-07-25T16:23:21Z
dc.date.available2023-07-25T16:23:21Z
dc.identifierhttp://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1278
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7806475
dc.descriptionWe 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.
dc.formatapplication/pdf
dc.languageeng
dc.publisherMonthly Notices of the Royal Astronomical Society
dc.relationcitation: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
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/4.0
dc.subjectinfo:eu-repo/classification/Inspec/Gravitational lensing
dc.subjectinfo:eu-repo/classification/Inspec/Surveys
dc.subjectinfo:eu-repo/classification/Inspec/Galaxies: evolution
dc.subjectinfo:eu-repo/classification/Inspec/Cosmology: miscellaneous
dc.subjectinfo:eu-repo/classification/Inspec/Infrared: galaxies
dc.subjectinfo:eu-repo/classification/Inspec/Submillimeter
dc.subjectinfo:eu-repo/classification/cti/1
dc.subjectinfo:eu-repo/classification/cti/21
dc.subjectinfo:eu-repo/classification/cti/21
dc.titleAzTEC millimetre survey of the COSMOS field – II. Source count overdensity and correlations with large-scale structure
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/acceptedVersion
dc.audiencestudents
dc.audienceresearchers
dc.audiencegeneralPublic


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