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The Atacama Cosmology Telescope: measurement and analysis of 1D beams for DR4

Lungu, Marius, Storer, Emilie R., Hasselfield, Matthew, Duivenvoorden, Adriaan J., Calabrese, Erminia ORCID:, Chesmore, Grace E., Choi, Steve K., Dunkley, Jo, Dünner, Rolando, Gallardo, Patricio A., Golec, Joseph E., Guan, Yilun, Hill, J. Colin, Hincks, Adam D., Hubmayr, Johannes, Madhavacheril, Mathew S., Mallaby-Kay, Maya, McMahon, Jeff, Moodley, Kavilan, Naess, Sigurd, Nati, Federico, Niemack, Michael D., Page, Lyman A., Partridge, Bruce, Puddu, Roberto, Schillaci, Alessandro, Sifón, Cristóbal, Staggs, Suzanne, Sunder, Dhaneshwar D., Wollack, Edward J. and Xu, Zhilei 2022. The Atacama Cosmology Telescope: measurement and analysis of 1D beams for DR4. Journal of Cosmology and Astroparticle Physics 2022 (05) , 044. 10.1088/1475-7516/2022/05/044

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We describe the measurement and treatment of the telescope beams for the Atacama Cosmology Telescope's fourth data release, DR4. Observations of Uranus are used to measure the central portion (<12') of the beams to roughly -40 dB of the peak. Such planet maps in intensity are used to construct azimuthally averaged beam profiles, which are fit with a physically motivated model before being transformed into Fourier space. We investigate and quantify a number of percent-level corrections to the beams, all of which are important for precision cosmology. Uranus maps in polarization are used to measure the temperature-to-polarization leakage in the main part of the beams, which is ≲ 1% (2.5%) at 150 GHz (98 GHz). The beams also have polarized sidelobes, which are measured with observations of Saturn and deprojected from the ACT time-ordered data. Notable changes relative to past ACT beam analyses include an improved subtraction of the atmospheric effects from Uranus calibration maps, incorporation of a scattering term in the beam profile model, and refinements to the beam model uncertainties and the main temperature-to-polarization leakage terms in the ACT power spectrum analysis.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: IOP Publishing
ISSN: 1475-7516
Date of First Compliant Deposit: 15 July 2022
Date of Acceptance: 17 March 2022
Last Modified: 10 Nov 2022 11:38

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