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- W3100683185 abstract "We present the results of a 7-12 GHz phased-array study of the Galactic center magnetar J1745-2900 with the Karl G. Jansky Very Large Array (VLA). Using data from two 6.5 hour observations from September 2014, we find that the average profile is comprised of several distinct components at these epochs and is stable over $sim$day timescales and $sim$GHz frequencies. Comparison with additional phased VLA data at 8.7 GHz shows significant profile changes on longer timescales. The average profile at 7-12 GHz is dominated by the jitter of relatively narrow pulses. The pulses in each of the four main profile components seen in September 2014 are uncorrelated in phase and amplitude, though there is a small but significant correlation in the occurrence of pulses in two of the profile components. Using the brightest pulses, we measure the dispersion and scattering parameters of J1745-2900. A joint fit of 38 pulses gives a 10 GHz pulse broadening time of $tau_{rm sc, 10} = 0.09 pm 0.03~rm ms$ and a dispersion measure of ${rm DM} = 1760^{+2.4}_{-1.3}~{rm pc~cm}^{-3}$. Both of these results are consistent with previous measurements, which suggests that the scattering and dispersion measure of J1745-2900 may be stable on timescales of several years." @default.
- W3100683185 created "2020-11-23" @default.
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- W3100683185 date "2019-04-24" @default.
- W3100683185 modified "2023-10-02" @default.
- W3100683185 title "VLA Observations of Single Pulses from the Galactic Center Magnetar" @default.
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- W3100683185 doi "https://doi.org/10.3847/1538-4357/ab100a" @default.
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