Long-term scintillation studies of EPTA pulsars : I. Observations and basic results

Medientyp: E-Artikel
Titel: Long-term scintillation studies of EPTA pulsars : I. Observations and basic results : I. Observations and basic results
Beteiligte: Liu, Yulan; Verbiest, Joris P. W.; Main, Robert A.; Wu, Ziwei; Ambalappat, Krishnakumar Moochickal; Champion, David J.; Cognard, Ismaël; Guillemot, Lucas; Gaikwad, Madhuri; Janssen, Gemma H.; Kramer, Michael; Keith, Michael J.; Karuppusamy, Ramesh; Künkel, Lars; Liu, Kuo; McKee, James W.; Mickaliger, Mitchell B.; Stappers, Ben W.; Shaifullah, Golam. M.; Theureau, Gilles
Erschienen: EDP Sciences, 2022
Erschienen in: Astronomy & Astrophysics
Sprache: Nicht zu entscheiden
DOI: 10.1051/0004-6361/202142552
ISSN: 1432-0746; 0004-6361
Schlagwörter: Space and Planetary Science ; Astronomy and Astrophysics
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Beschreibung: <jats:p><jats:italic>Context.</jats:italic> Interstellar scintillation analysis of pulsars allows us to probe the small-scale distribution and inhomogeneities of the ionized interstellar medium. From the frequency scale of scintillation, one can estimate the geometric time delays from multipath propagation, a source of (typically) unmodeled, correlated noise in pulsar timing. Interstellar scintillation analysis of well-timed pulsars is useful to quantify the effects of time delays and may lead to improved timing precision, enhancing the probability of detecting gravitational waves.</jats:p> <jats:p><jats:italic>Aims.</jats:italic> Our priority is to present the data set and the basic measurements of scintillation parameters of pulsars, employing long-term scintillation observations carried out from 2011 January to 2020 August by the European Pulsar Timing Array radio telescopes in the 21-cm and 11-cm bands. Additionally, we aim to identify future possible lines of study using this long-term scintillation data set.</jats:p> <jats:p><jats:italic>Methods.</jats:italic> The autocorrelation function of dynamic spectra has been used to estimate the scintillation bandwidth <jats:italic>v</jats:italic><jats:sub>d</jats:sub> and scintillation timescale <jats:italic>τ</jats:italic><jats:sub>d</jats:sub>.</jats:p> <jats:p><jats:italic>Results.</jats:italic> We present the long-term time series of <jats:italic>v</jats:italic><jats:sub>d</jats:sub> and <jats:italic>τ</jats:italic><jats:sub>d</jats:sub> for 13 pulsars. Sanity checks and comparisons indicate that the scintillation parameters of our work and previously published works are mostly consistent. For two pulsars, PSRs J1857+0943 and J1939+2134, we were able to obtain measurements of the <jats:italic>v</jats:italic><jats:sub>d</jats:sub> at both bands, which allowed us to derive the time series of frequency scaling indices with a mean and a standard deviation of 2.82 ± 1.95 and 3.18 ± 0.60, respectively. We found some interesting features which will be studied in more detail in subsequent papers in this series: (i) in the time series of PSR J1939+2134, where <jats:italic>v</jats:italic><jats:sub>d</jats:sub> and <jats:italic>τ</jats:italic><jats:sub>d</jats:sub> sharply decrease associated with a sharp increase in the dispersion measure; (ii) PSR J0613-0200 and PSR J0636+5126 show a strong annual variation in the time series of the <jats:italic>τ</jats:italic><jats:sub>d</jats:sub>; and (iii) PSR J1939+2134 shows a weak anticorrelation between the scintillation timescale and the dispersion in Westerbork Synthesis Radio Telescope data.</jats:p>
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