APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Pratik Tarafdar (Institute of Mathematical Sciences, India)
Title: The Indian Pulsar Timing Array: Joining the global hunt for nanohertz gravitational waves and related sciences
Date (JST): Thu, Mar 23, 2023, 11:00 - 12:30
Place: Seminar Room A
Abstract: We present InPTA DR1, the first official Indo-Japanese data
contribution to the International Pulsar Timing Array (IPTA) consortium
aiming to inaugurate the era of nanohertz gravitational wave astronomy
in the very near future. Our data enriches the pool being populated by
PTAs around the globe such as NANOGrav, European Pulsar Timing Array and
Parkes Pulsar Timing Array. It expands the overall frequency coverage
and sensitivity of the combined dataset for incorporation in the
upcoming third data release by the IPTA. This is expected to play a
critical role in the first-ever detection of nanohertz gravitational
waves. InPTA DR1 comprises the pulse arrival times, timing solutions and
the highest-precision interstellar dispersion measures obtained so far,
for fourteen millisecond pulsars chosen from the IPTA sample. The time
baseline of the current release spans over 3.5 years of data obtained
using the upgraded Giant Metrewave Radio Telescope (uGMRT). This dataset
forms the basis of our recent studies and findings including recent
profile change event in PSR J1713+0747, detection of CME with pulsar
timing, investigation of scatter broadening in MSPs, wideband timing,
single pulsar noise analysis, and chromaticity of decorrelation
bandwidths and dispersion measures.