WALOP-South: A wide-field one-shot linear optical polarimeter for PASIPHAE survey
Rattachement africain : in, gr, us, no, Afrique du Sud. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
WALOP (Wide-Area Linear Optical Polarimeter)-South, to be mounted on the 1m SAAO telescope in South Africa, is first of the two WALOP instruments currently under development for carrying out the PASIPHAE survey. Scheduled for commissioning in the year 2021, the WALOP instruments will be used to measure the linear polarization of around 10⁶ stars in the SDSS-r broadband with 0.1 % polarimetric accuracy, covering 4000 square degrees in the Galactic polar regions. The combined capabilities of one-shot linear polarimetry, high polarimetric accuracy (< 0.1 %) and polarimetric sensitivity (< 0.05 %), and a large field of view (FOV) of 35 35 arcminutes make WALOP-South a unique astronomical instrument. In a single exposure, it is designed to measure the Stokes parameters I, q and u in the SDSS-r broadband and narrowband filters between 500-700 nm. During each measurement, four images of the full field corresponding to the polarization angles of 0°, 45°, 90° and 135° will be imaged on four detectors and carrying out differential photometry on these images will yield the Stokes parameters. Major challenges in designing WALOP-South instrument include- (a) in the optical design, correcting for the spectral dispersion introduced by large split angle Wollaston Prisms used as polarization analyzers as well as aberrations from the wide field, and (b) making an optomechanical design adherent to the tolerances required to obtain good imaging and polarimetric performance under all temperature conditions as well as telescope pointing positions. We present the optical and optomechanical design for WALOP-South which overcomes these challenges.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
Où se fait cette recherche
-
Inter-University Centre for Astronomy and Astrophysics pays non établi dans la noticeStructure de recherche
-
University of Crete pays non établi dans la noticeUniversité ou école supérieure
-
Foundation for Research and Technology Hellas pays non établi dans la noticeStructure de recherche
-
California Institute of Technology pays non établi dans la noticeUniversité ou école supérieure
-
National Institute of Science Education and Research pays non établi dans la noticeUniversité ou école supérieure
-
University of Oslo pays non établi dans la noticeUniversité ou école supérieure
-
University of Johannesburg University of Johannesburg, Afrique du Sud (code pays fourni par la source)Université ou école supérieure
-
South African Radio Astronomy Observatory Afrique du Sud (code pays fourni par la source)Structure de recherche
-
South African Astronomical Observatory Afrique du Sud (code pays fourni par la source)Structure de recherche
-
Inter-Univ. Ctr. for Astronomy and Astrophysics (India) pays non établi dans la noticeInstitution
-
Institute of Astrophysics pays non établi dans la noticeStructure de recherche
-
Univ. of Crete (Greece) pays non établi dans la noticeInstitution
Inter-University Centre for Astronomy and Astrophysics, University of Crete et Foundation for Research and Technology Hellas, avec 9 autres affiliations. Pays d’affiliation : Afrique du Sud.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.