Dokumentdetails
ID
oai:arXiv.org:2412.05452
Thema
Astrophysics - High Energy Astroph... Astrophysics - Instrumentation and...Autor
Fiore, William McLaughlin, Maura A. Agazie, Gabriella Anumarlapudi, Akash Archibald, Anne M. Arzoumanian, Zaven Baker, Paul T. Brook, Paul R. Cromartie, H. Thankful Crowter, Kathryn DeCesar, Megan E. Demorest, Paul B. Dey, Lankeswar Dolch, Timothy Ferrara, Elizabeth C. Fonseca, Emmanuel Freedman, Gabriel E. Garver-Daniels, Nate Gentile, Peter A. Glaser, Joseph Good, Deborah C. Hazboun, Jeffrey S. Jennings, Ross J. Jones, Megan L. Kaplan, David L. Kerr, Matthew Lam, Michael T. Lorimer, Duncan R. Luo, Jing Lynch, Ryan S. McEwen, Alexander McMann, Natasha Meyers, Bradley W. Ng, Cherry Nice, David J. Pennucci, Timothy T. Perera, Benetge B. P. Pol, Nihan S. Radovan, Henri A. Ransom, Scott M. Ray, Paul S. Schmiedekamp, Ann Schmiedekamp, Carl Shapiro-Albert, Brent J. Stairs, Ingrid H. Stovall, Kevin Susobhanan, Abhimanyu Swiggum, Joseph K. Wahl, Haley M.Kategorie
Wissenschaften: Astrophysik
Jahr
2024
Auflistungsdatum
11.12.2024
Schlüsselwörter
psr data j1022+1001 astrophysics nanograv pulsar profile pulseZusammenfassung
Pulse profile stability is a central assumption of standard pulsar timing methods.
Thus, it is important for pulsar timing array experiments such as the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) to account for any pulse profile variability present in their data sets.
We show that in the NANOGrav 15-yr data set, the integrated pulse profile of PSR J1022+1001 as seen by the Arecibo radio telescope at 430, 1380, and 2030 MHz varies considerably in its shape from observation to observation.
We investigate the possibility that this is due to the "ideal feed assumption" (IFA), on which NANOGrav's routine polarization calibration procedure relies.
PSR J1022+1001 is $\sim 90\%$ polarized in one pulse profile component, and also has significant levels of circular polarization.
Time-dependent deviations in the feed's polarimetric response (PR) could cause mixing between the intensity I and the other Stokes parameters, leading to the observed variability.
We calibrate the PR using a mixture of Measurement Equation Modeling and Measurement Equation Template Matching techniques.
The resulting profiles are no less variable than those calibrated using the IFA method, nor do they provide an improvement in the timing quality of this pulsar.
We observe the pulse shape in 25-MHz bandwidths to vary consistently across the band, which cannot be explained by interstellar scintillation in combination with profile evolution with frequency.
Instead, we favor phenomena intrinsic to the pulsar as the cause.
;Comment: 18 pages, 16 figures, 4 tables.
Submitted to ApJ
Fiore, William,McLaughlin, Maura A.,Agazie, Gabriella,Anumarlapudi, Akash,Archibald, Anne M.,Arzoumanian, Zaven,Baker, Paul T.,Brook, Paul R.,Cromartie, H. Thankful,Crowter, Kathryn,DeCesar, Megan E.,Demorest, Paul B.,Dey, Lankeswar,Dolch, Timothy,Ferrara, Elizabeth C.,Fonseca, Emmanuel,Freedman, Gabriel E.,Garver-Daniels, Nate,Gentile, Peter A.,Glaser, Joseph,Good, Deborah C.,Hazboun, Jeffrey S.,Jennings, Ross J.,Jones, Megan L.,Kaplan, David L.,Kerr, Matthew,Lam, Michael T.,Lorimer, Duncan R.,Luo, Jing,Lynch, Ryan S.,McEwen, Alexander,McMann, Natasha,Meyers, Bradley W.,Ng, Cherry,Nice, David J.,Pennucci, Timothy T.,Perera, Benetge B. P.,Pol, Nihan S.,Radovan, Henri A.,Ransom, Scott M.,Ray, Paul S.,Schmiedekamp, Ann,Schmiedekamp, Carl,Shapiro-Albert, Brent J.,Stairs, Ingrid H.,Stovall, Kevin,Susobhanan, Abhimanyu,Swiggum, Joseph K.,Wahl, Haley M., 2024, Pulse Profile Variability of PSR J1022+1001 in NANOGrav Data
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