Results from the Atacama B-mode Search (ABS) experiment
We report 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 μK√s. One o...
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| creator | 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. ~Nolta, Michael Jr, Lyman A. Page Palma, Gonzalo A. Parker, Lucas Raghunathan, Srinivasan Reintsema, Carl D. Sievers, Jonathan Simon, Sara M. Staggs, Suzanne T. Visnjic, Katerina Yoon, Ki-Won |
| description | We report 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 μK√s. 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 |
| doi_str_mv | 10.1088/1475-7516/2018/09/005 |
| format | Article |
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Page ; Palma, Gonzalo A. ; Parker, Lucas ; Raghunathan, Srinivasan ; Reintsema, Carl D. ; Sievers, Jonathan ; Simon, Sara M. ; Staggs, Suzanne T. ; Visnjic, Katerina ; Yoon, Ki-Won</creator><creatorcontrib>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. ; ~Nolta, Michael ; Jr, Lyman A. Page ; Palma, Gonzalo A. ; Parker, Lucas ; Raghunathan, Srinivasan ; Reintsema, Carl D. ; Sievers, Jonathan ; Simon, Sara M. ; Staggs, Suzanne T. ; Visnjic, Katerina ; Yoon, Ki-Won ; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States) ; Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)</creatorcontrib><description>We report 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 μK√s. 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. Finally, 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.</description><identifier>ISSN: 1475-7516</identifier><identifier>EISSN: 1475-7516</identifier><identifier>DOI: 10.1088/1475-7516/2018/09/005</identifier><language>eng</language><publisher>United States: Institute of Physics (IOP)</publisher><subject>ASTRONOMY AND ASTROPHYSICS ; CMB experiments, CMB polarization, gravitational waves and CMB polarization, physics of the early universe ; cosmic background radiation ; Cosmology: observations ; Gravitational waves ; inflation ; Polarization</subject><ispartof>Journal of cosmology and astroparticle physics, 2018-09, Vol.2018 (9), p.5-5</ispartof><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c346t-45c9b970c0c59b89254472cd3e46383a2953b1f218e2f250d2bfeca9f518ac223</citedby><cites>FETCH-LOGICAL-c346t-45c9b970c0c59b89254472cd3e46383a2953b1f218e2f250d2bfeca9f518ac223</cites><orcidid>000000028224859X</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,315,781,785,886,27929,27930</link.rule.ids><backlink>$$Uhttps://www.osti.gov/servlets/purl/1475421$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Kusaka, Akito</creatorcontrib><creatorcontrib>Appel, John</creatorcontrib><creatorcontrib>Essinger-Hileman, Thomas</creatorcontrib><creatorcontrib>Beall, James A.</creatorcontrib><creatorcontrib>Campusano, Luis E.</creatorcontrib><creatorcontrib>Cho, Hsiao-Mei</creatorcontrib><creatorcontrib>Choi, Steve K.</creatorcontrib><creatorcontrib>Crowley, Kevin</creatorcontrib><creatorcontrib>Fowler, Joseph W.</creatorcontrib><creatorcontrib>Gallardo, Patricio</creatorcontrib><creatorcontrib>Hasselfield, Matthew</creatorcontrib><creatorcontrib>Hilton, Gene</creatorcontrib><creatorcontrib>Ho, Shuay-Pwu P.</creatorcontrib><creatorcontrib>Irwin, Kent</creatorcontrib><creatorcontrib>Jarosik, Norman</creatorcontrib><creatorcontrib>Niemack, Michael D.</creatorcontrib><creatorcontrib>Nixon, Glen W.</creatorcontrib><creatorcontrib>~Nolta, Michael</creatorcontrib><creatorcontrib>Jr, Lyman A. Page</creatorcontrib><creatorcontrib>Palma, Gonzalo A.</creatorcontrib><creatorcontrib>Parker, Lucas</creatorcontrib><creatorcontrib>Raghunathan, Srinivasan</creatorcontrib><creatorcontrib>Reintsema, Carl D.</creatorcontrib><creatorcontrib>Sievers, Jonathan</creatorcontrib><creatorcontrib>Simon, Sara M.</creatorcontrib><creatorcontrib>Staggs, Suzanne T.</creatorcontrib><creatorcontrib>Visnjic, Katerina</creatorcontrib><creatorcontrib>Yoon, Ki-Won</creatorcontrib><creatorcontrib>SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)</creatorcontrib><creatorcontrib>Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)</creatorcontrib><title>Results from the Atacama B-mode Search (ABS) experiment</title><title>Journal of cosmology and astroparticle physics</title><description>We report the Atacama B-mode Search is an experiment designed to measure the cosmic microwave background polarization at large angular scales (0ℓ>4). 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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 μK√s. 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. Finally, 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.</abstract><cop>United States</cop><pub>Institute of Physics (IOP)</pub><doi>10.1088/1475-7516/2018/09/005</doi><tpages>1</tpages><orcidid>https://orcid.org/000000028224859X</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | Journal of cosmology and astroparticle physics, 2018-09, Vol.2018 (9), p.5-5 |
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| subjects | ASTRONOMY AND ASTROPHYSICS CMB experiments, CMB polarization, gravitational waves and CMB polarization, physics of the early universe cosmic background radiation Cosmology: observations Gravitational waves inflation Polarization |
| title | Results from the Atacama B-mode Search (ABS) experiment |
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