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: https://orcid.org/0000-0003-0837-0068, 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

Full text not available from this repository.

Abstract

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:	Professional Services > Advanced Research Computing @ Cardiff (ARCCA) 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:	17 Jun 2024 14:50
URI:	https://orca.cardiff.ac.uk/id/eprint/151331

Actions (repository staff only)

Edit Item