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The MSPSR catalogue: VLBA astrometry of 18 millisecond pulsars
H. Ding, A. T. Deller, B. W. Stappers +13
With unparalleled rotational stability, millisecond pulsars (MSPs) serve as ideal laboratories for numerous astrophysical studies, many of which require precise knowledge of the di…
Scattering variability detected from the circumsource medium of FRB 20190520B
S. K. Ocker, J. M. Cordes, S. Chatterjee +5
Fast radio bursts (FRBs) are millisecond-timescale radio transients, the origins of which are predominantly extragalactic and likely involve highly magnetized compact objects. FRBs…
An unusual pulse shape change event in PSR J1713+0747 observed with the Green Bank Telescope and CHIME
Ross J. Jennings, James M. Cordes, Shami Chatterjee +41
The millisecond pulsar J1713+0747 underwent a sudden and significant pulse shape change between April 16 and 17, 2021 (MJDs 59320 and 59321). Subsequently, the pulse shape graduall…
Heliosphere Meets Interstellar Medium, in a Galactic Context
Stella Koch Ocker, James Cordes, Shami Chatterjee +8
The physical conditions within our heliosphere are driven by the Sun's motion through an evolving interstellar environment that remains largely unexplored. The next generation of o…
Resolving the inner parsec of the blazar J1924-2914 with the Event Horizon Telescope
Sara Issaoun, Maciek Wielgus, Svetlana Jorstad +27
The blazar J1924-2914 is a primary Event Horizon Telescope (EHT) calibrator for the Galactic Center's black hole Sagittarius A*. Here we present the first total and linearly polari…
Radio Scattering Horizons for Galactic and Extragalactic Transients
S. K. Ocker, J. M. Cordes, S. Chatterjee +1
Radio wave scattering can cause severe reductions in detection sensitivity for surveys of Galactic and extragalactic fast (ms duration) transients. While Galactic sources lik…