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THE 2014 ALMA LONG BASELINE CAMPAIGN: AN OVERVIEW
VILLARD, E.
Université Pierre et Marie Curie - Paris 6 [UPMC]
Unité de Recherche sur les Maladies Cardiovasculaires, du Métabolisme et de la Nutrition = Research Unit on Cardiovascular and Metabolic Diseases [ICAN]
Université Pierre et Marie Curie - Paris 6 [UPMC]
Unité de Recherche sur les Maladies Cardiovasculaires, du Métabolisme et de la Nutrition = Research Unit on Cardiovascular and Metabolic Diseases [ICAN]
LEROY, A. K.
Centre d'Investigation Clinique - Innovation Technologique - INSERM - CHU de Grenoble [CIC-IT Grenoble (CIT803)]
< Réduire
Centre d'Investigation Clinique - Innovation Technologique - INSERM - CHU de Grenoble [CIC-IT Grenoble (CIT803)]
Langue
en
Article de revue
Ce document a été publié dans
The Astrophysical journal letters. 2015-07, vol. 808, n° 1, p. id. L1
Bristol : IOP Publishing
Résumé en anglais
A major goal of the Atacama Large Millimeter/submillimeter Array (ALMA) is to make accurate images with resolutions of tens of milliarcseconds, which at submillimeter (submm) wavelengths requires baselines up to ~15 km. ...Lire la suite >
A major goal of the Atacama Large Millimeter/submillimeter Array (ALMA) is to make accurate images with resolutions of tens of milliarcseconds, which at submillimeter (submm) wavelengths requires baselines up to ~15 km. To develop and test this capability, a Long Baseline Campaign (LBC) was carried out from September to late November 2014, culminating in end-to-end observations, calibrations, and imaging of selected Science Verification (SV) targets. This paper presents an overview of the campaign and its main results, including an investigation of the short-term coherence properties and systematic phase errors over the long baselines at the ALMA site, a summary of the SV targets and observations, and recommendations for science observing strategies at long baselines. Deep ALMA images of the quasar 3C138 at 97 and 241 GHz are also compared to VLA 43 GHz results, demonstrating an agreement at a level of a few percent. As a result of the extensive program of LBC testing, the highly successful SV imaging at long baselines achieved angular resolutions as fine as 19 mas at ~350 GHz. Observing with ALMA on baselines of up to 15 km is now possible, and opens up new parameter space for submm astronomy.< Réduire
Mots clés en anglais
instrumentation: interferometers
techniques: high angular resolution
telescopes
techniques: interferometric
submillimeter: general
Origine
Importé de halUnités de recherche