Fig. 2: The dynamic spectra and polarization pulse profiles of ASKAP J1935+2148 from the MeerKAT beamformed data.
From: An emission-state-switching radio transient with a 54-minute period
Left: a bright detection on 3 February 2023. Right: a weaker detection on 8 May 2023. The data have a time resolution of 2.4 ms and are de-dispersed to a DM of 145.8 pc cm−3and corrected for an RM of +159.3 rad m−2. Top: the polarization position angle (PA; for values of linear polarization greater than three times the off-pulse noise), which is observed to be flat across the main pulse profile in the left panel. The insufficient signal-to-noise ratio during the detection on 8 May 2023 prevented robust measurements of polarization position angles. Middle: the Stokes parameter pulse profiles for ASKAP J1935+2148 at 1,284 MHz where black represents the total intensity, magenta represents linear polarization and blue represents circular polarization. The flux density is in arbitrary units as the data are not flux calibrated. The arrows indicate the positions of the pre- and post-cursor bursts for the detection on 3 February 2023 (left). Bottom: the dynamic spectra where the backwards sweeping striations across the observing band in the left panel correspond to ~50 Hz radio-frequency interference.
