Cosmology Large Angular Scale Surveyor (CLASS): 90 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance

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dc.contributor.authorDatta, Rahul
dc.contributor.authorBrewer, Michael K.
dc.contributor.authorCouto, Jullianna Denes
dc.contributor.authorEimer, Joseph
dc.contributor.authorLi, Yunyang
dc.contributor.authorXu, Zhilei
dc.contributor.authorAli, Aamir
dc.contributor.authorAppel, John W.
dc.contributor.authorBennett, Charles L.
dc.contributor.authorBustos, Ricardo
dc.contributor.authorChuss, David T.
dc.contributor.authorCleary, Joseph
dc.contributor.authorDahal, Sumit
dc.contributor.authorInostroza, Francisco Raul Javier Espinoza
dc.contributor.authorEssinger-Hileman, Thomas
dc.contributor.authorFluxa, Pedro
dc.contributor.authorHarrington, Kathleen
dc.contributor.authorHelson, Kyle
dc.contributor.authorIuliano, Jeffrey
dc.contributor.authorKarakla, John
dc.contributor.authorMarriage, Tobias A.
dc.contributor.authorNovack, Sasha
dc.contributor.authorNunez, Carolina
dc.contributor.authorPadilla, Ivan L.
dc.contributor.authorParker, Lucas
dc.contributor.authorPetroff, Matthew A.
dc.contributor.authorReeves, Rodrigo
dc.contributor.authorRostem, Karwan
dc.contributor.authorShi, Rui
dc.contributor.authorValle, Deniz A. N.
dc.contributor.authorWatts, Duncan J.
dc.contributor.authorWeiland, Janet L.
dc.contributor.authorWollack, Edward J.
dc.contributor.authorZeng, Lingzhen
dc.date.accessioned2025-01-20T16:12:25Z
dc.date.available2025-01-20T16:12:25Z
dc.date.issued2024
dc.description.abstractThe Cosmology Large Angular Scale Surveyor (CLASS) is a telescope array that observes the cosmic microwave background (CMB) over similar to 75% of the sky from the Atacama Desert, Chile, at frequency bands centered near 40, 90, 150, and 220 GHz. CLASS measures the large angular scale CMB polarization to constrain the tensor-to-scalar ratio and the optical depth to last scattering. This paper presents the optical characterization of the 90 GHz telescope. Observations of the Moon establish the pointing while dedicated observations of Jupiter are used for beam calibration. The standard deviations of the pointing error in azimuth, elevation, and boresight angle are 1.' 3, 2.' 1, and 2.' 0, respectively, over the first 3 yr of observations. This corresponds to a pointing uncertainty similar to 7% of the beam's full width at half-maximum (FWHM). The effective azimuthally symmetrized instrument 1D beam estimated at 90 GHz has an FWHM of 0.degrees 620 +/- 0.degrees 003 and a solid angle of 138.7 +/- 0.6(stats.) +/- 1.1(sys.) mu sr integrated to a radius of 4 degrees. The corresponding beam window function drops to b & ell;2=0.93,0.71,0.14 at & ell; = 30, 100, 300, respectively. Far-sidelobes are studied using detector-centered intensity maps of the Moon and measured to be at a level of 10-3 or below relative to the peak. The polarization angle of Tau A estimated from preliminary survey maps is 149 degrees.6 +/- 0 degrees.2(stats.) in equatorial coordinates. The instrumental temperature-to-polarization (T -> P) leakage fraction, inferred from per-detector demodulated Jupiter scan data, has a monopole component at the level of 1.7 x 10-3, a dipole component with an amplitude of 4.3 x 10-3, with no evidence of quadrupolar leakage.
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4365/ad50a0
dc.identifier.eissn1538-4365
dc.identifier.issn0067-0049
dc.identifier.urihttps://doi.org/10.3847/1538-4365/ad50a0
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90332
dc.identifier.wosidWOS:001275852900001
dc.issue.numero2
dc.language.isoen
dc.revistaAstrophysical journal supplement series
dc.rightsacceso restringido
dc.titleCosmology Large Angular Scale Surveyor (CLASS): 90 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance
dc.typeartículo
dc.volumen273
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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