Spin-Down Measurement of PSR J1813-1749: The Energetic Pulsar Powering HESS J1813-178

TL;DR

This paper measures the spin-down rate of the energetic pulsar PSR J1813-1749, revealing its high energy output and discussing its distance and observational constraints across multiple wavelengths.

Contribution

It provides the first precise spin-down measurement of PSR J1813-1749 and analyzes its energetic properties and distance estimates using X-ray observations.

Findings

PSR J1813-1749 is the third most energetic pulsar in the Galaxy.

No pulsed radio or gamma-ray emission detected from the pulsar.

The pulsar's spin-down luminosity is 5.6E37 erg/s.

Abstract

Two new X-ray timing observations of the 44.7 ms pulsar in G12.82-0.02/HESS J1813-178 were obtained with Chandra and XMM-Newton to determine its precise spin-down rate. With a period derivative of dP/dt = 1.265E-13, PSR J1813-1749 is the third most energetic pulsar in the Galaxy, having spin-down luminosity dE/dt = 5.6E37 erg/s. Lack of pulsed detection in a deep radio search from the Green Bank Telescope, and in gamma-rays from Fermi, are reported. We reconsider the distance to PSR J1813-1749/G12.82-0.02 in view of its large X-ray measured column density, N(H) = 10.E22 cm^-2, which exceeds the visual extinction A(V) = 9.1 to a young stellar cluster at d = 4.8 kpc that has been associated with it. Although the distance may well be larger, existing data do not constrain it further. The small radiative output of PSR J1813-1749/G12.82-0.02 in all bands would not exceed its spin-down power at any distance in the Galactic disk.