The Low-Frequency Radio Eclipses of the Black Widow Pulsar J1810+1744

E. J. Polzin, R. P. Breton, A. O. Clarke, V. I. Kondratiev, B. W. Stappers, J. W. T. Hessels, C. G. Bassa, J. W. Broderick, J. -M. Grießmeier, C. Sobey, S. ter Veen, J. van Leeuwen, P. Weltevrede

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    We have observed and analysed the eclipses of the black widow pulsar J1810+1744 at low radio frequencies. Using LOw-Frequency ARray (LOFAR) and Westerbork Synthesis Radio Telescope observations between 2011--2015 we have measured variations in flux density, dispersion measure and scattering around eclipses. High-time-resolution, simultaneous beamformed and interferometric imaging LOFAR observations show concurrent disappearance of pulsations and total flux from the source during the eclipses, with a $3\sigma$ upper limit of 36 mJy ($pulsars averaged out-of-eclipse flux density). The dispersion measure variations are highly asymmetric, suggesting a tail of material swept back due to orbital motion. The egress deviations are variable on timescales shorter than the 3.6 hr orbital period and are indicative of a clumpy medium. Additional pulse broadening detected during egress is typically $
    Original languageEnglish
    JournalMonthly Notices of the Royal Astronomical Society
    Early online date9 Feb 2018
    Publication statusPublished - 2018


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