Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A Measurement of Circular Polarization at 40 GHz
We report measurements of circular polarization from the first two years of observation with the 40 GHz polarimeter of the Cosmology Large Angular Scale Surveyor (CLASS). CLASS is conducting a multi-frequency survey covering 75% of the sky from the Atacama Desert designed to measure the cosmic micro...
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| Veröffentlicht in: | The Astrophysical journal 2020-02, Vol.889 (2), p.105 |
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| creator | Padilla, Ivan L. Eimer, Joseph R. Li, Yunyang Addison, Graeme E. Ali, Aamir Appel, John W. Bennett, Charles L. Bustos, Ricardo Brewer, Michael K. Chan, Manwei Chuss, David T. Cleary, Joseph Couto, Jullianna Dahal, Sumit Denis, Kevin Dünner, Rolando Essinger-Hileman, Thomas Fluxá, Pedro Gothe, Dominik Haridas, Saianeesh K. Harrington, Kathleen Iuliano, Jeffrey Karakla, John Marriage, Tobias A. Miller, Nathan J. Núñez, Carolina Parker, Lucas Petroff, Matthew A. Reeves, Rodrigo Rostem, Karwan Stevens, Robert W. Nunes Valle, Deniz Augusto Watts, Duncan J. Weiland, Janet L. Wollack, Edward J. Xu, Zhilei |
| description | We report measurements of circular polarization from the first two years of observation with the 40 GHz polarimeter of the Cosmology Large Angular Scale Surveyor (CLASS). CLASS is conducting a multi-frequency survey covering 75% of the sky from the Atacama Desert designed to measure the cosmic microwave background (CMB) linear E and B polarization on angular scales 1° θ ≤ 90°, corresponding to a multipole range of 2 ≤ 200. The modulation technology enabling measurements of linear polarization at the largest angular scales from the ground, the Variable-delay Polarization Modulator, is uniquely designed to provide explicit sensitivity to circular polarization (Stokes V). We present a first detection of circularly polarized atmospheric emission at 40 GHz that is well described by a dipole with an amplitude of when observed at an elevation of 45°, and discuss its potential impact on the recovery of linear polarization by CLASS. Filtering the atmospheric component, CLASS places a 95% confidence upper limit of to on for , representing an improvement by two orders of magnitude over previous CMB limits. |
| doi_str_mv | 10.3847/1538-4357/ab61f8 |
| format | Article |
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CLASS is conducting a multi-frequency survey covering 75% of the sky from the Atacama Desert designed to measure the cosmic microwave background (CMB) linear E and B polarization on angular scales 1° θ ≤ 90°, corresponding to a multipole range of 2 ≤ 200. The modulation technology enabling measurements of linear polarization at the largest angular scales from the ground, the Variable-delay Polarization Modulator, is uniquely designed to provide explicit sensitivity to circular polarization (Stokes V). We present a first detection of circularly polarized atmospheric emission at 40 GHz that is well described by a dipole with an amplitude of when observed at an elevation of 45°, and discuss its potential impact on the recovery of linear polarization by CLASS. 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All rights reserved.</rights><rights>Copyright IOP Publishing Feb 01, 2020</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c380t-25495c382f6ecdabe9c7240172ce686d1361c2d3945c50382e180cb7ce9468ba3</citedby><cites>FETCH-LOGICAL-c380t-25495c382f6ecdabe9c7240172ce686d1361c2d3945c50382e180cb7ce9468ba3</cites><orcidid>0000-0003-1248-9563 ; 0000-0001-8468-9391 ; 0000-0002-2061-0063 ; 0000-0003-1127-0965 ; 0000-0002-5437-6121 ; 0000-0003-4939-076X ; 0000-0001-5112-2567 ; 0000-0001-6519-502X ; 0000-0002-4436-4215 ; 0000-0002-0024-2662 ; 0000-0002-0552-3754 ; 0000-0001-8839-7206 ; 0000-0002-4782-3851 ; 0000-0002-7567-4451 ; 0000-0002-8412-630X ; 0000-0003-4496-6520 ; 0000-0002-2147-2248 ; 0000-0002-4820-1122 ; 0000-0003-4189-0700 ; 0000-0003-0016-0533 ; 0000-0002-1708-5464 ; 0000-0001-6976-180X ; 0000-0002-5247-2523</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.3847/1538-4357/ab61f8/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>314,776,780,27903,27904,38869,53845</link.rule.ids><linktorsrc>$$Uhttps://iopscience.iop.org/article/10.3847/1538-4357/ab61f8$$EView_record_in_IOP_Publishing$$FView_record_in_$$GIOP_Publishing</linktorsrc></links><search><creatorcontrib>Padilla, Ivan L.</creatorcontrib><creatorcontrib>Eimer, Joseph R.</creatorcontrib><creatorcontrib>Li, Yunyang</creatorcontrib><creatorcontrib>Addison, Graeme E.</creatorcontrib><creatorcontrib>Ali, Aamir</creatorcontrib><creatorcontrib>Appel, John W.</creatorcontrib><creatorcontrib>Bennett, Charles L.</creatorcontrib><creatorcontrib>Bustos, Ricardo</creatorcontrib><creatorcontrib>Brewer, Michael K.</creatorcontrib><creatorcontrib>Chan, Manwei</creatorcontrib><creatorcontrib>Chuss, David T.</creatorcontrib><creatorcontrib>Cleary, Joseph</creatorcontrib><creatorcontrib>Couto, Jullianna</creatorcontrib><creatorcontrib>Dahal, Sumit</creatorcontrib><creatorcontrib>Denis, Kevin</creatorcontrib><creatorcontrib>Dünner, Rolando</creatorcontrib><creatorcontrib>Essinger-Hileman, Thomas</creatorcontrib><creatorcontrib>Fluxá, Pedro</creatorcontrib><creatorcontrib>Gothe, Dominik</creatorcontrib><creatorcontrib>Haridas, Saianeesh K.</creatorcontrib><creatorcontrib>Harrington, Kathleen</creatorcontrib><creatorcontrib>Iuliano, Jeffrey</creatorcontrib><creatorcontrib>Karakla, John</creatorcontrib><creatorcontrib>Marriage, Tobias A.</creatorcontrib><creatorcontrib>Miller, Nathan J.</creatorcontrib><creatorcontrib>Núñez, Carolina</creatorcontrib><creatorcontrib>Parker, Lucas</creatorcontrib><creatorcontrib>Petroff, Matthew A.</creatorcontrib><creatorcontrib>Reeves, Rodrigo</creatorcontrib><creatorcontrib>Rostem, Karwan</creatorcontrib><creatorcontrib>Stevens, Robert W.</creatorcontrib><creatorcontrib>Nunes Valle, Deniz Augusto</creatorcontrib><creatorcontrib>Watts, Duncan J.</creatorcontrib><creatorcontrib>Weiland, Janet L.</creatorcontrib><creatorcontrib>Wollack, Edward J.</creatorcontrib><creatorcontrib>Xu, Zhilei</creatorcontrib><title>Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A Measurement of Circular Polarization at 40 GHz</title><title>The Astrophysical journal</title><addtitle>APJ</addtitle><addtitle>Astrophys. J</addtitle><description>We report measurements of circular polarization from the first two years of observation with the 40 GHz polarimeter of the Cosmology Large Angular Scale Surveyor (CLASS). CLASS is conducting a multi-frequency survey covering 75% of the sky from the Atacama Desert designed to measure the cosmic microwave background (CMB) linear E and B polarization on angular scales 1° θ ≤ 90°, corresponding to a multipole range of 2 ≤ 200. The modulation technology enabling measurements of linear polarization at the largest angular scales from the ground, the Variable-delay Polarization Modulator, is uniquely designed to provide explicit sensitivity to circular polarization (Stokes V). We present a first detection of circularly polarized atmospheric emission at 40 GHz that is well described by a dipole with an amplitude of when observed at an elevation of 45°, and discuss its potential impact on the recovery of linear polarization by CLASS. Filtering the atmospheric component, CLASS places a 95% confidence upper limit of to on for , representing an improvement by two orders of magnitude over previous CMB limits.</description><subject>Astronomical instrumentation</subject><subject>Astrophysics</subject><subject>Big Bang theory</subject><subject>Circular polarization</subject><subject>Cosmic microwave background</subject><subject>Cosmic microwave background radiation</subject><subject>Cosmology</subject><subject>Dipoles</subject><subject>Early universe</subject><subject>Linear polarization</subject><subject>Multipoles</subject><subject>Observational cosmology</subject><subject>Polarimeters</subject><subject>Polarization</subject><subject>Reionization</subject><subject>Sky surveys</subject><subject>Sky surveys 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Cosmology Large Angular Scale Surveyor (CLASS) Observations: A Measurement of Circular Polarization at 40 GHz</title><author>Padilla, Ivan L. ; Eimer, Joseph R. ; Li, Yunyang ; Addison, Graeme E. ; Ali, Aamir ; Appel, John W. ; Bennett, Charles L. ; Bustos, Ricardo ; Brewer, Michael K. ; Chan, Manwei ; Chuss, David T. ; Cleary, Joseph ; Couto, Jullianna ; Dahal, Sumit ; Denis, Kevin ; Dünner, Rolando ; Essinger-Hileman, Thomas ; Fluxá, Pedro ; Gothe, Dominik ; Haridas, Saianeesh K. ; Harrington, Kathleen ; Iuliano, Jeffrey ; Karakla, John ; Marriage, Tobias A. ; Miller, Nathan J. ; Núñez, Carolina ; Parker, Lucas ; Petroff, Matthew A. ; Reeves, Rodrigo ; Rostem, Karwan ; Stevens, Robert W. ; Nunes Valle, Deniz Augusto ; Watts, Duncan J. ; Weiland, Janet L. ; Wollack, Edward J. ; Xu, 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| fulltext | fulltext_linktorsrc |
| identifier | ISSN: 0004-637X |
| ispartof | The Astrophysical journal, 2020-02, Vol.889 (2), p.105 |
| issn | 0004-637X 1538-4357 |
| language | eng |
| recordid | cdi_proquest_journals_2357575159 |
| source | IOP Publishing Free Content |
| subjects | Astronomical instrumentation Astrophysics Big Bang theory Circular polarization Cosmic microwave background Cosmic microwave background radiation Cosmology Dipoles Early universe Linear polarization Multipoles Observational cosmology Polarimeters Polarization Reionization Sky surveys Sky surveys (astronomy) |
| title | Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A Measurement of Circular Polarization at 40 GHz |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-27T05%3A38%3A26IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_O3W&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Two-year%20Cosmology%20Large%20Angular%20Scale%20Surveyor%20(CLASS)%20Observations:%20A%20Measurement%20of%20Circular%20Polarization%20at%2040%20GHz&rft.jtitle=The%20Astrophysical%20journal&rft.au=Padilla,%20Ivan%20L.&rft.date=2020-02-01&rft.volume=889&rft.issue=2&rft.spage=105&rft.pages=105-&rft.issn=0004-637X&rft.eissn=1538-4357&rft_id=info:doi/10.3847/1538-4357/ab61f8&rft_dat=%3Cproquest_O3W%3E2357575159%3C/proquest_O3W%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=2357575159&rft_id=info:pmid/&rfr_iscdi=true |