[7] It presents a compact astrophysical jet[8] that is 0.1" ~200 pc wide, a high molecular gas mass measuring 4.4 × 1010 M[9] and contains a gigahertz peaked-spectrum radio source (GPS)[10] within the extent of its narrow-line region (<~1 kpc).

[12] Such infrared galaxies like PKS 1345+125, are in a transition state between the "cold" (f25 m/f60 m < 0.2) ULIG phenomenon, where active star formation are occurring,[13] with their accretion disks forming around the black hole and in optical quasar phases.

[15] According to researchers who studied PKS 1345+125, the galaxy contains ratios of narrow optical emission lines; this indicates Seyfert 2 activity.

[16][17] The two nuclei in the galaxy have a projected separation of ≈ 2″ ~ 4 kpc and are surrounded by an extended asymmetrical galactic halo that is detected in both infrared and optical images.

[19] Furthermore, a powerful obscured quasar nucleus at wavelengths, is detected with a broad (△vFWHM ~ 2600 km s−1) Pa emission, through recent near-infrared spectroscopic observations.

From a VLBI study on neutral hydrogen inside nuclear regions of this object, they showed most gas detected close to the systemic velocity, are found to be associated with an off-nuclear cloud ( ~ 50 to 100 pc from its radio core.

The velocity profile of the gas on the other hand, is relatively broad ( ~ 150 km s−1), which researchers interpret this as a sign of kinematical evidence for interaction of the radio plasma with the cloud.

The broadest component (FWHM ~2000 km/s) is blue shifted by ~2000 km/s with respect to the galaxy halo and HI absorption, which they interpret it as material outflow.