High Precision Measurements of Interstellar Dispersion Measure with the upgraded GMRT

Understand

Pulsar radio emission undergoes dispersion due to the presence of free electrons in the interstellar medium (ISM).

• The dispersive delay in the arrival time of pulsar signal changes over time due to the varying ISM electron column density along the line of sight.
• Correcting for this delay accurately is crucial for the detection of nanohertz gravitational waves using Pulsar Timing Arrays.
• In this work, we present in-band and inter-band DM estimates of four pulsars observed with uGMRT over the timescale of a year using two different template alignment methods.