PSR J1631−4722: the discovery of a young and energetic pulsar in the supernova remnant G336.7+0.5

Detecting a pulsar associated with a supernova remnant (SNR) and/or pulsar wind nebula (PWN) is crucial for unraveling its formation history and pulsar wind dynamics, yet the association with a radio pulsar is observed only in a small fraction of known SNRs and PWNe. In this paper, we report the discovery of a young pulsar J1631−4722, associated with the Galactic SNR G336.7+0.5 using Murriyang, Commonwealth Scientific and Industrial Research Organisation (CSIRO)’s Parkes radio telescope. It is also potentially associated with a PWN revealed by the Rapid ASKAP (Australian Square Kilometre Array Pathfinder) Continuum Survey (RACS). This 118 ms pulsar has a high dispersion measure of ∼873 pc cm⁻³ and a rotation measure of –1004 rad m⁻². Because of such a high DM, at frequencies below 2 GHz, the pulse profile is significantly scattered, making it effectively undetectable in previous pulsar surveys at ∼1.4 GHz. Follow-up observations yield a period derivative of P˙ = 5.5 × 10⁻¹⁴, implying a characteristic age, τ_c = 33.9 kyr, and spin-down luminosity, E˙ = 1.3 × 10³⁶ erg s⁻¹. PSR J1631−4722, with its high spin-down luminosity and potential link to a PWN, stands out as a promising source of the highenergy γ -ray emission observed in the region.