Results from the Atacama B-mode Search (ABS) experiment

Akito Kusaka, John Appel, Thomas Essinger-Hileman, James A. Beall, Luis E. Campusano, Hsiao Mei Cho, Steve K. Choi, Kevin Crowley, Joseph W. Fowler, Patricio Gallardo, Matthew Hasselfield, Gene Hilton, Shuay Pwu P. Ho, Kent Irwin, Norman Jarosik, Michael D. Niemack, Glen W. Nixon, Michael Snolta, Lyman A. Page, Gonzalo A. PalmaLucas Parker, Srinivasan Raghunathan, Carl D. Reintsema, Jonathan Sievers, Sara M. Simon, Suzanne T. Staggs, Katerina Visnjic, Ki Won Yoon

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The Atacama B-mode Search is an experiment designed to measure the cosmic microwave background polarization at large angular scales (0ℓ>4). It observes at 145 GHz from a site at 5,190 m elevation in northern Chile. The noise equivalent polarization temperature, or NEQ, is 41 μKs. One of the unique features of ABS is its use of a rapidly rotating ambient-temperature half-wave plate (HWP) {as the first optical element}. {The HWP spins} at 2.55 Hz to modulate the incident polarized signal at frequencies above where instrument white noise dominates over atmospheric fluctuations and other sources of low-frequency noise. We report here on the analysis of data from a 2,400 deg2 region of sky. We perform a blind analysis to reduce potential bias. After unblinding, we find agreement with the Planck TE and EE measurements on the same region of sky, {with a derived calibration factor of 00.89 ± 0.1}. We marginally detect polarized dust emission {(at 3.2 σ for EE and 2.2 σ for BB)} and give an upper limit on the tensor-to-scalar ratio of r<2.3 (95% confidence level) with the equivalent of 100 on-sky days of observation. We also present a new measurement of the polarization of Tau A and introduce new methods for calibration and data analysis associated with HWP-based observations.

Original languageEnglish (US)
Article number005
JournalJournal of Cosmology and Astroparticle Physics
Volume2018
Issue number9
DOIs
StatePublished - Sep 4 2018

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sky
polarization
Chile
white noise
ambient temperature
confidence
dust
tensors
scalars
low frequencies
microwaves
temperature

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

Cite this

Kusaka, A., Appel, J., Essinger-Hileman, T., Beall, J. A., Campusano, L. E., Cho, H. M., ... Yoon, K. W. (2018). Results from the Atacama B-mode Search (ABS) experiment. Journal of Cosmology and Astroparticle Physics, 2018(9), [005]. https://doi.org/10.1088/1475-7516/2018/09/005
Kusaka, Akito ; Appel, John ; Essinger-Hileman, Thomas ; Beall, James A. ; Campusano, Luis E. ; Cho, Hsiao Mei ; Choi, Steve K. ; Crowley, Kevin ; Fowler, Joseph W. ; Gallardo, Patricio ; Hasselfield, Matthew ; Hilton, Gene ; Ho, Shuay Pwu P. ; Irwin, Kent ; Jarosik, Norman ; Niemack, Michael D. ; Nixon, Glen W. ; Snolta, Michael ; Page, Lyman A. ; Palma, Gonzalo A. ; Parker, Lucas ; Raghunathan, Srinivasan ; Reintsema, Carl D. ; Sievers, Jonathan ; Simon, Sara M. ; Staggs, Suzanne T. ; Visnjic, Katerina ; Yoon, Ki Won. / Results from the Atacama B-mode Search (ABS) experiment. In: Journal of Cosmology and Astroparticle Physics. 2018 ; Vol. 2018, No. 9.
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abstract = "The Atacama B-mode Search is an experiment designed to measure the cosmic microwave background polarization at large angular scales (0ℓ>4). It observes at 145 GHz from a site at 5,190 m elevation in northern Chile. The noise equivalent polarization temperature, or NEQ, is 41 μKs. One of the unique features of ABS is its use of a rapidly rotating ambient-temperature half-wave plate (HWP) {as the first optical element}. {The HWP spins} at 2.55 Hz to modulate the incident polarized signal at frequencies above where instrument white noise dominates over atmospheric fluctuations and other sources of low-frequency noise. We report here on the analysis of data from a 2,400 deg2 region of sky. We perform a blind analysis to reduce potential bias. After unblinding, we find agreement with the Planck TE and EE measurements on the same region of sky, {with a derived calibration factor of 00.89 ± 0.1}. We marginally detect polarized dust emission {(at 3.2 σ for EE and 2.2 σ for BB)} and give an upper limit on the tensor-to-scalar ratio of r<2.3 (95{\%} confidence level) with the equivalent of 100 on-sky days of observation. We also present a new measurement of the polarization of Tau A and introduce new methods for calibration and data analysis associated with HWP-based observations.",
author = "Akito Kusaka and John Appel and Thomas Essinger-Hileman and Beall, {James A.} and Campusano, {Luis E.} and Cho, {Hsiao Mei} and Choi, {Steve K.} and Kevin Crowley and Fowler, {Joseph W.} and Patricio Gallardo and Matthew Hasselfield and Gene Hilton and Ho, {Shuay Pwu P.} and Kent Irwin and Norman Jarosik and Niemack, {Michael D.} and Nixon, {Glen W.} and Michael Snolta and Page, {Lyman A.} and Palma, {Gonzalo A.} and Lucas Parker and Srinivasan Raghunathan and Reintsema, {Carl D.} and Jonathan Sievers and Simon, {Sara M.} and Staggs, {Suzanne T.} and Katerina Visnjic and Yoon, {Ki Won}",
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Kusaka, A, Appel, J, Essinger-Hileman, T, Beall, JA, Campusano, LE, Cho, HM, Choi, SK, Crowley, K, Fowler, JW, Gallardo, P, Hasselfield, M, Hilton, G, Ho, SPP, Irwin, K, Jarosik, N, Niemack, MD, Nixon, GW, Snolta, M, Page, LA, Palma, GA, Parker, L, Raghunathan, S, Reintsema, CD, Sievers, J, Simon, SM, Staggs, ST, Visnjic, K & Yoon, KW 2018, 'Results from the Atacama B-mode Search (ABS) experiment', Journal of Cosmology and Astroparticle Physics, vol. 2018, no. 9, 005. https://doi.org/10.1088/1475-7516/2018/09/005

Results from the Atacama B-mode Search (ABS) experiment. / Kusaka, Akito; Appel, John; Essinger-Hileman, Thomas; Beall, James A.; Campusano, Luis E.; Cho, Hsiao Mei; Choi, Steve K.; Crowley, Kevin; Fowler, Joseph W.; Gallardo, Patricio; Hasselfield, Matthew; Hilton, Gene; Ho, Shuay Pwu P.; Irwin, Kent; Jarosik, Norman; Niemack, Michael D.; Nixon, Glen W.; Snolta, Michael; Page, Lyman A.; Palma, Gonzalo A.; Parker, Lucas; Raghunathan, Srinivasan; Reintsema, Carl D.; Sievers, Jonathan; Simon, Sara M.; Staggs, Suzanne T.; Visnjic, Katerina; Yoon, Ki Won.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2018, No. 9, 005, 04.09.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Results from the Atacama B-mode Search (ABS) experiment

AU - Kusaka, Akito

AU - Appel, John

AU - Essinger-Hileman, Thomas

AU - Beall, James A.

AU - Campusano, Luis E.

AU - Cho, Hsiao Mei

AU - Choi, Steve K.

AU - Crowley, Kevin

AU - Fowler, Joseph W.

AU - Gallardo, Patricio

AU - Hasselfield, Matthew

AU - Hilton, Gene

AU - Ho, Shuay Pwu P.

AU - Irwin, Kent

AU - Jarosik, Norman

AU - Niemack, Michael D.

AU - Nixon, Glen W.

AU - Snolta, Michael

AU - Page, Lyman A.

AU - Palma, Gonzalo A.

AU - Parker, Lucas

AU - Raghunathan, Srinivasan

AU - Reintsema, Carl D.

AU - Sievers, Jonathan

AU - Simon, Sara M.

AU - Staggs, Suzanne T.

AU - Visnjic, Katerina

AU - Yoon, Ki Won

PY - 2018/9/4

Y1 - 2018/9/4

N2 - The Atacama B-mode Search is an experiment designed to measure the cosmic microwave background polarization at large angular scales (0ℓ>4). It observes at 145 GHz from a site at 5,190 m elevation in northern Chile. The noise equivalent polarization temperature, or NEQ, is 41 μKs. One of the unique features of ABS is its use of a rapidly rotating ambient-temperature half-wave plate (HWP) {as the first optical element}. {The HWP spins} at 2.55 Hz to modulate the incident polarized signal at frequencies above where instrument white noise dominates over atmospheric fluctuations and other sources of low-frequency noise. We report here on the analysis of data from a 2,400 deg2 region of sky. We perform a blind analysis to reduce potential bias. After unblinding, we find agreement with the Planck TE and EE measurements on the same region of sky, {with a derived calibration factor of 00.89 ± 0.1}. We marginally detect polarized dust emission {(at 3.2 σ for EE and 2.2 σ for BB)} and give an upper limit on the tensor-to-scalar ratio of r<2.3 (95% confidence level) with the equivalent of 100 on-sky days of observation. We also present a new measurement of the polarization of Tau A and introduce new methods for calibration and data analysis associated with HWP-based observations.

AB - The Atacama B-mode Search is an experiment designed to measure the cosmic microwave background polarization at large angular scales (0ℓ>4). It observes at 145 GHz from a site at 5,190 m elevation in northern Chile. The noise equivalent polarization temperature, or NEQ, is 41 μKs. One of the unique features of ABS is its use of a rapidly rotating ambient-temperature half-wave plate (HWP) {as the first optical element}. {The HWP spins} at 2.55 Hz to modulate the incident polarized signal at frequencies above where instrument white noise dominates over atmospheric fluctuations and other sources of low-frequency noise. We report here on the analysis of data from a 2,400 deg2 region of sky. We perform a blind analysis to reduce potential bias. After unblinding, we find agreement with the Planck TE and EE measurements on the same region of sky, {with a derived calibration factor of 00.89 ± 0.1}. We marginally detect polarized dust emission {(at 3.2 σ for EE and 2.2 σ for BB)} and give an upper limit on the tensor-to-scalar ratio of r<2.3 (95% confidence level) with the equivalent of 100 on-sky days of observation. We also present a new measurement of the polarization of Tau A and introduce new methods for calibration and data analysis associated with HWP-based observations.

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DO - 10.1088/1475-7516/2018/09/005

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Kusaka A, Appel J, Essinger-Hileman T, Beall JA, Campusano LE, Cho HM et al. Results from the Atacama B-mode Search (ABS) experiment. Journal of Cosmology and Astroparticle Physics. 2018 Sep 4;2018(9). 005. https://doi.org/10.1088/1475-7516/2018/09/005