Comparing recent PTA results on the nanohertz stochastic gravitational wave background - full noise and GWB parameter comparison plots

A full collection of plots comparing the noise properties of individual pulsars and gravitational wave background parameters discussed in the companion paper Comparing recent PTA results on the nanohertz stochastic gravitational wave background (IPTA 2024).

Section4_GWB_comparison.zip supplements and expands section 4.1, "Comparing the published GWB measurements," of IPTA (2024). It contains parameter difference distributions for GWB model parameters.  There are four different models included. The HD correlated powerlaw (PL) model make up the basis for Figure 2.  Additionally, there are three comparisons not included in IPTA (2024).  First, comparisons the common uncorrelated red noise (CURN) PL model are included.  Finally,  comparisons of two free spectral (FS) models (HD and CURN) are included.  These comparisons fit the HD and CURN FS posteriors using the ceffyl software package, and then compare the parameters of the resulting powerlaw fits.

Section5_Noise_comparison.zip supplements section 5, "Comparing Pulsar Noice Properties," of IPTA (2024).  It contains plots for 27 pulsars timed by more than one PTA collaboration, including the plots for PSR J1012+5307, which are presented in Figure 7.  The plots include noise parameter posteriors, time domain GP realizations, TOA residuals, and TOA radio frequency.