The Atacama Cosmology Telescope: Mitigating the Impact of Extragalactic Foregrounds for the DR6 Cosmic Microwave Background Lensing Analysis

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dc.contributor.authorMacCrann, Niall
dc.contributor.authorSherwin, Blake D.
dc.contributor.authorQu, Frank J.
dc.contributor.authorNamikawa, Toshiya
dc.contributor.authorMadhavacheril, Mathew S.
dc.contributor.authorAbril-Cabezas, Irene
dc.contributor.authorAn, Rui
dc.contributor.authorAustermann, Jason E.
dc.contributor.authorBattaglia, Nicholas
dc.contributor.authorBattistelli, Elia S.
dc.contributor.authorBeall, James A.
dc.contributor.authorBolliet, Boris
dc.contributor.authorBond, J. Richard
dc.contributor.authorCai, Hongbo
dc.contributor.authorCalabrese, Erminia
dc.contributor.authorCoulton, William R.
dc.contributor.authorDarwish, Omar
dc.contributor.authorDuff, Shannon M.
dc.contributor.authorDuivenvoorden, Adriaan J.
dc.contributor.authorDunkley, Jo
dc.contributor.authorFarren, Gerrit S.
dc.contributor.authorFerraro, Simone
dc.contributor.authorGolec, Joseph E.
dc.contributor.authorGuan, Yilun
dc.contributor.authorHan, Dongwon
dc.contributor.authorHervias-Caimapo, Carlos
dc.contributor.authorHill, J. Colin
dc.contributor.authorHilton, Matt
dc.contributor.authorHlozek, Renee
dc.contributor.authorHubmayr, Johannes
dc.contributor.authorKim, Joshua
dc.contributor.authorLi, Zack
dc.contributor.authorKosowsky, Arthur
dc.contributor.authorLouis, Thibaut
dc.contributor.authorMcMahon, Jeff
dc.contributor.authorA. Marques, Gabriela
dc.contributor.authorMoodley, Kavilan
dc.contributor.authorNaess, Sigurd
dc.contributor.authorNiemack, Michael D.
dc.contributor.authorPage, Lyman
dc.contributor.authorPartridge, Bruce
dc.contributor.authorSchaan, Emmanuel
dc.contributor.authorSehgal, Neelima
dc.contributor.authorSifon, Cristobal
dc.contributor.authorWollack, Edward J.
dc.contributor.authorSalatino, Maria
dc.contributor.authorUllom, Joel N.
dc.contributor.authorVan Lanen, Jeff
dc.contributor.authorVan Engelen, Alexander
dc.contributor.authorWenzl, Lukas
dc.date.accessioned2025-01-20T16:19:40Z
dc.date.available2025-01-20T16:19:40Z
dc.date.issued2024
dc.description.abstractWe investigate the impact and mitigation of extragalactic foregrounds for the cosmic microwave background (CMB) lensing power spectrum analysis of Atacama Cosmology Telescope (ACT) data release 6 (DR6) data. Two independent microwave sky simulations are used to test a range of mitigation strategies. We demonstrate that finding and then subtracting point sources, finding and then subtracting models of clusters, and using a profile bias-hardened lensing estimator together reduce the fractional biases to well below statistical uncertainties, with the inferred lensing amplitude, A lens, biased by less than 0.2 sigma. We also show that another method where a model for the cosmic infrared background (CIB) contribution is deprojected and high-frequency data from Planck is included has similar performance. Other frequency-cleaned options do not perform as well, either incurring a large noise cost or resulting in biased recovery of the lensing spectrum. In addition to these simulation-based tests, we also present null tests on the ACT DR6 data for sensitivity of our lensing spectrum estimation to differences in foreground levels between the two ACT frequencies used, while nulling the CMB lensing signal. These tests pass whether the nulling is performed at the map or bandpower level. The CIB-deprojected measurement performed on the DR6 data is consistent with our baseline measurement, implying that contamination from the CIB is unlikely to significantly bias the DR6 lensing spectrum. This collection of tests gives confidence that the ACT DR6 lensing measurements and cosmological constraints presented in companion papers to this work are robust to extragalactic foregrounds.
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/ad2610
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ad2610
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90701
dc.identifier.wosidWOS:001210797400001
dc.issue.numero1
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.titleThe Atacama Cosmology Telescope: Mitigating the Impact of Extragalactic Foregrounds for the DR6 Cosmic Microwave Background Lensing Analysis
dc.typeartículo
dc.volumen966
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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