X-ray nondetection of PSR J0250+5854

Abstract

We conducted a deep XMM$\unicode{x2013}$Newton observing campaign on the 23.5-s radio pulsar PSR J0250+5854 in order to better understand the connection between long-period, radio-emitting neutron stars and their high-energy-emitting counterparts. No X-ray emission was detected resulting in an upper limit in the bolometric luminosity of PSR J0250+5854 of $<$10${}^{31}$ erg s${}^{-1}$ for an assumed blackbody with a temperature of 85 eV, typical of an X-ray Dim Isolated Neutron Star (XDINS). We compared the upper limit in the bolometric luminosity of PSR J0250+5854 with the known population of XDINSs and found that the upper limit is lower than the bolometric luminosity of all but one XDINS. We also compared PSR J0250+5854 with SGR 0418+5729, the magnetar with low dipole magnetic field strength, where the upper limit suggests that if PSR J0250+5854 has a thermal hot spot like SGR 0418+5729, it would have a blackbody temperature of $<$200 eV, compared to 320 eV of the magnetar.

4 pages, 2 figures, accepted by MNRAS

References in corpus (8)

• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• Magnetars: Properties, Origin and Evolution
• Discovery of a radio emitting neutron star with an ultra-long spin period of 76 seconds
• A radio transient with unusually slow periodic emission
• The SUrvey for Pulsars and Extragalactic Radio Bursts IV: Discovery and polarimetry of a 12.1-second radio pulsar
• Thermal and non-thermal X-ray emission from the rotation-powered radio/$\gamma$-ray pulsar PSR J1740+1000
• XMM-Newton observations of PSR J0726-2612, a radio-loud XDINS
• Two decades of X-ray observations of the isolated neutron star RX J1856.5-3754: detection of thermal and non-thermal hard X-rays and refined spin-down measurement

Cited by in corpus (1)

• 3D evolution of neutron star magnetic-fields from a realistic core-collapse turbulent topology