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The HERA-19 Commissioning Array: Direction-dependent Effects

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cam.issuedOnline2019-09-02
dc.contributor.authorKohn, SA
dc.contributor.authorAguirre, JE
dc.contributor.authorLa Plante, P
dc.contributor.authorBillings, TS
dc.contributor.authorChichura, PM
dc.contributor.authorFortino, AF
dc.contributor.authorIgarashi, AS
dc.contributor.authorBenefo, RK
dc.contributor.authorGallardo, S
dc.contributor.authorMartinot, ZE
dc.contributor.authorNunhokee, CD
dc.contributor.authorKern, NS
dc.contributor.authorBull, P
dc.contributor.authorLiu, A
dc.contributor.authorAlexander, P
dc.contributor.authorAli, ZS
dc.contributor.authorBeardsley, AP
dc.contributor.authorBernardi, G
dc.contributor.authorBowman, JD
dc.contributor.authorBradley, RF
dc.contributor.authorCarilli, CL
dc.contributor.authorCheng, C
dc.contributor.authorDeboer, DR
dc.contributor.authorAcedo, EDL
dc.contributor.authorDillon, JS
dc.contributor.authorEwall-Wice, A
dc.contributor.authorFadana, G
dc.contributor.authorFagnoni, N
dc.contributor.authorFritz, R
dc.contributor.authorFurlanetto, SR
dc.contributor.authorGlendenning, B
dc.contributor.authorGreig, B
dc.contributor.authorGrobbelaar, J
dc.contributor.authorHazelton, BJ
dc.contributor.authorHewitt, JN
dc.contributor.authorHickish, J
dc.contributor.authorJacobs, DC
dc.contributor.authorJulius, A
dc.contributor.authorKariseb, M
dc.contributor.authorKolopanis, M
dc.contributor.authorLekalake, T
dc.contributor.authorLoots, A
dc.contributor.authorMacmahon, D
dc.contributor.authorMalan, L
dc.contributor.authorMalgas, C
dc.contributor.authorMaree, M
dc.contributor.authorMathison, N
dc.contributor.authorMatsetela, E
dc.contributor.authorMesinger, A
dc.contributor.authorMorales, MF
dc.contributor.authorNeben, AR
dc.contributor.authorNikolic, B
dc.contributor.authorParsons, AR
dc.contributor.authorPatra, N
dc.contributor.authorPieterse, S
dc.contributor.authorPober, JC
dc.contributor.authorRazavi-Ghods, N
dc.contributor.authorRinguette, J
dc.contributor.authorRobnett, J
dc.contributor.authorRosie, K
dc.contributor.authorSell, R
dc.contributor.authorSmith, C
dc.contributor.authorSyce, A
dc.contributor.authorTegmark, M
dc.contributor.authorThyagarajan, N
dc.contributor.authorWilliams, PKG
dc.contributor.authorZheng, H
dc.contributor.orcidKohn, SA [0000-0001-6744-5328]
dc.contributor.orcidAguirre, JE [0000-0002-4810-666X]
dc.contributor.orcidLa Plante, P [0000-0002-4693-0102]
dc.contributor.orcidNunhokee, CD [0000-0002-5445-6586]
dc.contributor.orcidKern, NS [0000-0002-8211-1892]
dc.contributor.orcidLiu, A [0000-0001-6876-0928]
dc.contributor.orcidBeardsley, AP [0000-0001-9428-8233]
dc.contributor.orcidBernardi, G [0000-0002-0916-7443]
dc.contributor.orcidBowman, JD [0000-0002-8475-2036]
dc.contributor.orcidCarilli, CL [0000-0001-6647-3861]
dc.contributor.orcidDillon, JS [0000-0003-3336-9958]
dc.contributor.orcidEwall-Wice, A [0000-0002-0086-7363]
dc.contributor.orcidFurlanetto, SR [0000-0002-0658-1243]
dc.contributor.orcidHazelton, BJ [0000-0001-7532-645X]
dc.contributor.orcidJacobs, DC [0000-0002-0917-2269]
dc.contributor.orcidKolopanis, M [0000-0002-2950-2974]
dc.contributor.orcidMorales, MF [0000-0001-7694-4030]
dc.contributor.orcidNeben, AR [0000-0001-7776-7240]
dc.contributor.orcidPatra, N [0000-0002-9457-1941]
dc.contributor.orcidTegmark, M [0000-0001-7670-7190]
dc.contributor.orcidThyagarajan, N [0000-0003-1602-7868]
dc.contributor.orcidWilliams, PKG [0000-0003-3734-3587]
dc.date.accessioned2018-09-05T12:47:19Z
dc.date.available2018-09-05T12:47:19Z
dc.date.issued2019
dc.description.abstractForeground power dominates the measurements of interferometers that seek a statistical detection of highly-redshifted HI emission from the Epoch of Reionization (EoR). The chromaticity of the instrument creates a boundary in the Fourier transform of frequency (proportional to $k_\parallel$) between spectrally smooth emission, characteristic of the strong synchrotron foreground (the "wedge"), and the spectrally structured emission from HI in the EoR (the "EoR window"). Faraday rotation can inject spectral structure into otherwise smooth polarized foreground emission, which through instrument effects or miscalibration could possibly pollute the EoR window. Using data from the HERA 19-element commissioning array, we investigate the polarization response of this new instrument in the power spectrum domain. We perform a simple image-based calibration based on the unpolarized diffuse emission of the Global Sky Model, and show that it achieves qualitative redundancy between the nominally-redundant baselines of the array and reasonable amplitude accuracy. We construct power spectra of all fully polarized coherencies in all pseudo-Stokes parameters. We compare to simulations based on an unpolarized diffuse sky model and detailed electromagnetic simulations of the dish and feed, confirming that in Stokes I, the calibration does not add significant spectral structure beyond the expected level. Further, this calibration is stable over the 8 days of observations considered. Excess power is seen in the power spectra of the linear polarization Stokes parameters which is not easily attributable to leakage via the primary beam, and results from some combination of residual calibration errors and actual polarized emission. Stokes V is found to be highly discrepant from the expectation of zero power, strongly pointing to the need for more accurate polarized calibration.
dc.identifier.doi10.17863/CAM.26908
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/279535
dc.language.isoeng
dc.publisherAmerican Astronomical Society
dc.publisher.urlhttp://dx.doi.org/10.3847/1538-4357/ab2f72
dc.subjectcosmology: observations
dc.subjectdark ages, reionization, first stars
dc.subjectinstrumentation: interferometers
dc.subjectpolarization
dc.subjecttechniques: interferometric
dc.titleThe HERA-19 Commissioning Array: Direction-dependent Effects
dc.typeArticle
dcterms.dateAccepted2019-07-03
prism.issueIdentifier1
prism.publicationDate2019
prism.publicationNameAstrophysical Journal
prism.volume882
pubs.funder-project-idScience and Technology Facilities Council (ST/M001393/1)
rioxxterms.licenseref.startdate2019-09-01
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.typeJournal Article/Review
rioxxterms.versionAM
rioxxterms.versionofrecord10.3847/1538-4357/ab2f72

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