Portraits of the young and old in X-ray: New millisecond pulsar detections and updated characterisation of young neutron stars

Document Type

Journal Article

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Author

Published In

Monthly Notices of the Royal Astronomical Society

Haverford Libraries Support

Open Publishing Agreement - Oxford University Press

Article Number

stag1650

Publication Date

8-29-2026

Abstract

We present analyses of new and archival Chandra and NuSTAR data on two old millisecond pulsars, a young highly-energetic pulsar, and a young neutron star. PSR J1810−0623 is a recently-discovered 4.55 ms radio pulsar in a binary with a possible carbon-oxygen white dwarf companion. We tentatively detect the pulsar for the first time in X-ray using a new short Chandra HRC-I observation. Its faintness suggests a distance more in accord with the further (≈1kpc) of its dispersion measure-inferred distances. PSR J1933−6211 is a 3.54 ms radio pulsar also with a carbon-oxygen white dwarf companion. Our first-time X-ray detection in an archival HRC-S image indicates its X-ray luminosity is similar to that of the 1.9 ⊙ pulsar PSR J1614−2230. Next, PSR J1813−1749 is a 1–2 kyr pulsar with one of the highest known spin-down luminosities. We measure its spin period of 44.7 ms using 2025 NuSTAR and 2026 Chandra ACIS-S data and update its spin evolution model. We show for the first time the pulse profile of PSR J1813−1749 at 3–79 keV, and we find that the spectra of the pulsar and pulsar wind nebula at these energies did not change significantly between observations in 2018 and 2025. Finally, for the 5–10 kyr neutron star CXOU J182913.1−125113 in the supernova remnant G18.95−1.1, we combine ACIS-I observations from 2009 and 2024 to better measure the neutron star’s spectrum.

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