Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A First Detection of Atmospheric Circular Polarization at Q band

Observaciones de Cosmología a Gran Escala Angular (CLASS): Primera Detección de Polarización Circular Atmosférica en la Banda Q

dc.creatorPetroff, Matthew A.
dc.creatorEimer, Joseph R.
dc.creatorHarrington, Kathleen
dc.creatorAli, Aamir
dc.creatorAppel, John W.
dc.creatorBennett, Charles L.
dc.creatorBrewer, Michael K.
dc.creatorBustos Placencia, Ricardo
dc.creatorChan, Manwei
dc.creatorChuss, David T.
dc.creatorCleary, Joseph
dc.creatorDenes Couto, Jullianna
dc.creatorDahal, Sumit
dc.creatorDünner, Rolando
dc.creatorEssinger-Hileman, Thomas
dc.creatorFluxá Rojas, Pedro
dc.creatorGothe, Dominik
dc.creatorIuliano, Jeffrey
dc.creatorMarriage, Tobias A.
dc.creatorMiller, Nathan J.
dc.creatorNúñez, Carolina
dc.creatorPadilla, Ivan L.
dc.creatorParker, Lucas
dc.creatorReeves, Rodrigo
dc.creatorRostem, Karwan
dc.creatorNunes Valle, Deniz Augusto
dc.creatorWatts, Duncan J.
dc.creatorWeiland, Janet L.
dc.creatorWollack, Edward J.
dc.creatorXu, Zhilei
dc.date2020-06-27T03:01:12Z
dc.date2020-06-27T03:01:12Z
dc.date2020-02-01
dc.date.accessioned2022-10-18T12:07:34Z
dc.date.available2022-10-18T12:07:34Z
dc.identifierThe Astrophysical Journal, 889:120 (10pp), 2020 February 1
dc.identifier0004-637X
dc.identifierhttp://repositoriodigital.ucsc.cl/handle/25022009/2007
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/4441641
dc.descriptionThe Earth’s magnetic field induces Zeeman splitting of the magnetic dipole transitions of molecular oxygen in the atmosphere, which produces polarized emission in the millimeter-wave regime. This polarized emission is primarily circularly polarized and manifests as a foreground with a dipole-shaped sky pattern for polarizationsensitive ground-based cosmic microwave background experiments, such as the Cosmology Large Angular Scale Surveyor (CLASS), which is capable of measuring large angular scale circular polarization. Using atmospheric emission theory and radiative transfer formalisms, we model the expected amplitude and spatial distribution of this signal and evaluate the model for the CLASS observing site in the Atacama Desert of northern Chile. Then, using two years of observations at 32°. 3 to 43.7 GHz from the CLASS Q-band telescope, we present a detection of this signal and compare the observed signal to that predicted by the model. We recover an angle between magnetic north and true north of −5°. 5 ± 0°. 6, which is consistent with the expectation of −5°.9 for the CLASS observing site. When comparing dipole sky patterns fit to both simulated and data-derived sky maps, the dipole directions match to within a degree, and the measured amplitudes match to within ∼20%.
dc.languageen
dc.publisherAstrophysical Journal
dc.subjectCosmic microwave background radiation
dc.subjectObservational cosmology
dc.subjectPolarimeters
dc.subjectAstronomical instrumentation
dc.subjectAtmospheric effects
dc.titleTwo-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A First Detection of Atmospheric Circular Polarization at Q band
dc.titleObservaciones de Cosmología a Gran Escala Angular (CLASS): Primera Detección de Polarización Circular Atmosférica en la Banda Q
dc.typeArtículos de revistas


Este ítem pertenece a la siguiente institución