The NANOGrav 12.5 yr Data Set: Polarimetry and Faraday Rotation Measures from Observations of Millisecond Pulsars with the Green Bank Telescope
In this work, we present polarization profiles for 23 millisecond pulsars observed at 820 and 1500 MHz with the Green Bank Telescope as part of the NANOGrav pulsar timing array. We calibrate the data using Mueller matrix solutions calculated from observations of PSRs B1929+10 and J1022+1001. We disc...
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2022-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ac4045 |
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| author | H. M. Wahl M. A. McLaughlin P. A. Gentile M. L. Jones R. Spiewak Z. Arzoumanian K. Crowter P. B. Demorest M. E. DeCesar T. Dolch J. A. Ellis R. D. Ferdman E. C. Ferrara E. Fonseca N. Garver-Daniels G. Jones M. T. Lam L. Levin N. Lewandowska D. R. Lorimer R. S. Lynch D. R. Madison C. Ng D. J. Nice T. T. Pennucci S. M. Ransom P. Ray I. H. Stairs K. Stovall J. K. Swiggum W. W. Zhu |
| author_facet | H. M. Wahl M. A. McLaughlin P. A. Gentile M. L. Jones R. Spiewak Z. Arzoumanian K. Crowter P. B. Demorest M. E. DeCesar T. Dolch J. A. Ellis R. D. Ferdman E. C. Ferrara E. Fonseca N. Garver-Daniels G. Jones M. T. Lam L. Levin N. Lewandowska D. R. Lorimer R. S. Lynch D. R. Madison C. Ng D. J. Nice T. T. Pennucci S. M. Ransom P. Ray I. H. Stairs K. Stovall J. K. Swiggum W. W. Zhu |
| author_sort | H. M. Wahl |
| collection | DOAJ |
| description | In this work, we present polarization profiles for 23 millisecond pulsars observed at 820 and 1500 MHz with the Green Bank Telescope as part of the NANOGrav pulsar timing array. We calibrate the data using Mueller matrix solutions calculated from observations of PSRs B1929+10 and J1022+1001. We discuss the polarization profiles, which can be used to constrain pulsar emission geometry, and present both the first published radio polarization profiles for nine pulsars and the discovery of very low-intensity average profile components (“microcomponents”) in four pulsars. We obtain the Faraday rotation measures for each pulsar and use them to calculate the Galactic magnetic field parallel to the line of sight for different lines of sight through the interstellar medium. We fit for linear and sinusoidal trends in time in the dispersion measure and Galactic magnetic field and detect magnetic field variations with a period of 1 yr in some pulsars, but overall find that the variations in these parameters are more consistent with a stochastic origin. |
| first_indexed | 2024-03-12T01:48:07Z |
| format | Article |
| id | doaj.art-2f21f50e9c884ea185ffec406761b159 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T01:48:07Z |
| publishDate | 2022-01-01 |
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| series | The Astrophysical Journal |
| spelling | doaj.art-2f21f50e9c884ea185ffec406761b1592023-09-08T18:19:38ZengIOP PublishingThe Astrophysical Journal1538-43572022-01-01926216810.3847/1538-4357/ac4045The NANOGrav 12.5 yr Data Set: Polarimetry and Faraday Rotation Measures from Observations of Millisecond Pulsars with the Green Bank TelescopeH. M. Wahl0https://orcid.org/0000-0001-9678-0299M. A. McLaughlin1https://orcid.org/0000-0001-7697-7422P. A. Gentile2https://orcid.org/0000-0001-8158-683XM. L. Jones3https://orcid.org/0000-0001-6607-3710R. Spiewak4https://orcid.org/0000-0002-6730-3298Z. Arzoumanian5K. Crowter6P. B. Demorest7https://orcid.org/0000-0002-6664-965XM. E. DeCesar8https://orcid.org/0000-0002-2185-1790T. Dolch9https://orcid.org/0000-0001-8885-6388J. A. Ellis10R. D. Ferdman11https://orcid.org/0000-0002-2223-1235E. C. Ferrara12https://orcid.org/0000-0001-7828-7708E. Fonseca13https://orcid.org/0000-0001-8384-5049N. Garver-Daniels14G. Jones15M. T. Lam16https://orcid.org/0000-0003-0721-651XL. Levin17https://orcid.org/0000-0002-2034-2986N. Lewandowska18D. R. Lorimer19https://orcid.org/0000-0003-1301-966XR. S. Lynch20https://orcid.org/0000-0001-5229-7430D. R. Madison21https://orcid.org/0000-0003-2285-0404C. Ng22https://orcid.org/0000-0002-3616-5160D. J. Nice23https://orcid.org/0000-0002-6709-2566T. T. Pennucci24https://orcid.org/0000-0001-5465-2889S. M. Ransom25https://orcid.org/0000-0001-5799-9714P. Ray26https://orcid.org/0000-0002-5297-5278I. H. Stairs27https://orcid.org/0000-0001-9784-8670K. Stovall28https://orcid.org/0000-0002-7261-594XJ. K. Swiggum29https://orcid.org/0000-0002-1075-3837W. W. Zhu30https://orcid.org/0000-0001-5105-4058Department of Physics and Astronomy, West Virginia University , P.O. Box 6315, Morgantown, WV 26506, USA ; hmw0023@mix.wvu.edu; Center for Gravitational Waves and Cosmology, West Virginia University , Chestnut Ridge Research Building, Morgantown, WV 26505, USADepartment of Physics and Astronomy, West Virginia University , P.O. Box 6315, Morgantown, WV 26506, USA ; hmw0023@mix.wvu.edu; Center for Gravitational Waves and Cosmology, West Virginia University , Chestnut Ridge Research Building, Morgantown, WV 26505, USADepartment of Physics and Astronomy, West Virginia University , P.O. Box 6315, Morgantown, WV 26506, USA ; hmw0023@mix.wvu.edu; Center for Gravitational Waves and Cosmology, West Virginia University , Chestnut Ridge Research Building, Morgantown, WV 26505, USACenter for Gravitation, Cosmology and Astrophysics, Department of Physics, University of Wisconsin-Milwaukee , P.O. Box 413, Milwaukee, WI 53201, USAJodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester , Manchester M13 9PL, UK; Centre for Astrophysics and Supercomputing, Swinburne University of Technology , P.O. Box 218, Hawthorn, Victoria 3122, AustraliaX-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USADepartment of Physics and Astronomy, University of British Columbia , 6224 Agricultural Road, Vancouver, BC V6T 1Z1, CanadaNational Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM 87801, USAGeorge Mason University , Fairfax, VA, 22030, Resident at the Naval Research Laboratory, Washington, DC 20375, USADepartment of Physics, Hillsdale College, 33 E. College Street, Hillsdale, MI 49242, USA; Eureka Scientific, Inc. 2452 Delmer Street, Suite 100, Oakland, CA 94602-3017, USAInfinia ML, 202 Rigsbee Avenue, Durham, NC 27701, USASchool of Chemistry, University of East Anglia , Norwich, NR4 7TJ, UKNASA Goddard Space Flight Center, Greenbelt, MD 20771, USA; Department of Astronomy, University of Maryland , College Park, MD, 20742, USA; Center for Exploration and Space Studies (CRESST), NASA/GSFC, Greenbelt, MD 20771, USADepartment of Physics, McGill University , 3600 University Street, Montreal, QC H3A 2T8, CanadaDepartment of Physics and Astronomy, West Virginia University , P.O. Box 6315, Morgantown, WV 26506, USA ; hmw0023@mix.wvu.edu; Center for Gravitational Waves and Cosmology, West Virginia University , Chestnut Ridge Research Building, Morgantown, WV 26505, USADepartment of Astronomy, Columbia University , 550 W. 120th Street, New York, NY 10027, USASchool of Physics and Astronomy, Rochester Institute of Technology, Rochester, NY 14623, USA; Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NY 14623, USAJodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester , Manchester M13 9PL, UKDepartment of Physics and Astronomy, West Virginia University , P.O. Box 6315, Morgantown, WV 26506, USA ; hmw0023@mix.wvu.edu; Center for Gravitational Waves and Cosmology, West Virginia University , Chestnut Ridge Research Building, Morgantown, WV 26505, USADepartment of Physics and Astronomy, West Virginia University , P.O. Box 6315, Morgantown, WV 26506, USA ; hmw0023@mix.wvu.edu; Center for Gravitational Waves and Cosmology, West Virginia University , Chestnut Ridge Research Building, Morgantown, WV 26505, USAGreen Bank Observatory, P.O. Box 2, Green Bank, WV 24944, USADepartment of Physics and Astronomy, West Virginia University , P.O. Box 6315, Morgantown, WV 26506, USA ; hmw0023@mix.wvu.edu; Center for Gravitational Waves and Cosmology, West Virginia University , Chestnut Ridge Research Building, Morgantown, WV 26505, USA; Department of Physics, University of the Pacific , 3601 Pacific Avenue, Stockton, CA 95211, USADunlap Institute for Astronomy and Astrophysics, University of Toronto , 50 St. George Street, Toronto, ON M5S 3H4, CanadaDepartment of Physics, Lafayette College , Easton, PA 18042, USAInstitute of Physics, Eötvös Loránd University , Pázmány P.s. 1/A, 1117 Budapest, HungaryNational Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USASpace Science Division, Naval Research Laboratory, Washington, DC 20375-5352, USADepartment of Physics and Astronomy, University of British Columbia , 6224 Agricultural Road, Vancouver, BC V6T 1Z1, CanadaNational Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM 87801, USAGeorge Mason University , Fairfax, VA, 22030, Resident at the Naval Research Laboratory, Washington, DC 20375, USANational Astronomical Observatories, Chinese Academy of Science, 20A Datun Road, Chaoyang District, Beijing 100012, People's Republic of ChinaIn this work, we present polarization profiles for 23 millisecond pulsars observed at 820 and 1500 MHz with the Green Bank Telescope as part of the NANOGrav pulsar timing array. We calibrate the data using Mueller matrix solutions calculated from observations of PSRs B1929+10 and J1022+1001. We discuss the polarization profiles, which can be used to constrain pulsar emission geometry, and present both the first published radio polarization profiles for nine pulsars and the discovery of very low-intensity average profile components (“microcomponents”) in four pulsars. We obtain the Faraday rotation measures for each pulsar and use them to calculate the Galactic magnetic field parallel to the line of sight for different lines of sight through the interstellar medium. We fit for linear and sinusoidal trends in time in the dispersion measure and Galactic magnetic field and detect magnetic field variations with a period of 1 yr in some pulsars, but overall find that the variations in these parameters are more consistent with a stochastic origin.https://doi.org/10.3847/1538-4357/ac4045PulsarsInterstellar mediumAstronomical techniques |
| spellingShingle | H. M. Wahl M. A. McLaughlin P. A. Gentile M. L. Jones R. Spiewak Z. Arzoumanian K. Crowter P. B. Demorest M. E. DeCesar T. Dolch J. A. Ellis R. D. Ferdman E. C. Ferrara E. Fonseca N. Garver-Daniels G. Jones M. T. Lam L. Levin N. Lewandowska D. R. Lorimer R. S. Lynch D. R. Madison C. Ng D. J. Nice T. T. Pennucci S. M. Ransom P. Ray I. H. Stairs K. Stovall J. K. Swiggum W. W. Zhu The NANOGrav 12.5 yr Data Set: Polarimetry and Faraday Rotation Measures from Observations of Millisecond Pulsars with the Green Bank Telescope The Astrophysical Journal Pulsars Interstellar medium Astronomical techniques |
| title | The NANOGrav 12.5 yr Data Set: Polarimetry and Faraday Rotation Measures from Observations of Millisecond Pulsars with the Green Bank Telescope |
| title_full | The NANOGrav 12.5 yr Data Set: Polarimetry and Faraday Rotation Measures from Observations of Millisecond Pulsars with the Green Bank Telescope |
| title_fullStr | The NANOGrav 12.5 yr Data Set: Polarimetry and Faraday Rotation Measures from Observations of Millisecond Pulsars with the Green Bank Telescope |
| title_full_unstemmed | The NANOGrav 12.5 yr Data Set: Polarimetry and Faraday Rotation Measures from Observations of Millisecond Pulsars with the Green Bank Telescope |
| title_short | The NANOGrav 12.5 yr Data Set: Polarimetry and Faraday Rotation Measures from Observations of Millisecond Pulsars with the Green Bank Telescope |
| title_sort | nanograv 12 5 yr data set polarimetry and faraday rotation measures from observations of millisecond pulsars with the green bank telescope |
| topic | Pulsars Interstellar medium Astronomical techniques |
| url | https://doi.org/10.3847/1538-4357/ac4045 |
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