Chandra Observations of the High-Magnetic-Field Radio Pulsar J1718-3718

Abstract

High-magnetic-field pulsars represent an important class of objects for studying the relationship between magnetars and radio pulsars. Here we report on four Chandra observations of the high-magnetic-field pulsar J1718-3718 ($B=7.4\times 10^{13}$\,G) taken in 2009 as well as on a re-analysis of 2002 Chandra observations of the region. We also report an improved radio position for this pulsar based on ATCA observations. We detect X-ray pulsations at the pulsar's period in the 2009 data, with pulsed fraction 52%$\pm$13% in the 0.8--2.0 keV band. We find that the X-ray pulse is aligned with the radio pulse. The data from 2002 and 2009 show consistent spectra and fluxes; a merged overall spectrum is well fit by a blackbody of temperature $186_{-18}^{+19}$\,eV, slightly higher than predicted by standard cooling models, however, the best-fit neutron star atmosphere model is consistent with standard cooling. We find the bolometric luminosity $L_{\mathrm{bb}}^{\infty }=4_{-2}^{+5}\times 10^{32}$\,erg\,s${}^{-1}\sim 0.3\dot{E}$, for a distance of 4.5 kpc. We compile measurements of the temperatures of all X-ray detected high-$B$ pulsars as well as those of low-$B$ radio pulsars and find evidence for the former being on average hotter than the latter.

8 pages, 3 tables, 5 figures, published on ApJ

References in corpus (21)

• The strongest cosmic magnets: Soft Gamma-ray Repeaters and Anomalous X-ray Pulsars
• Transient pulsed radio emission from a magnetar
• The Vertical Structure of Warm Ionised Gas in the Milky Way
• The Magnificent Seven: Magnetic fields and surface temperature distributions
• 1E 1547.0-5408: a radio-emitting magnetar with a rotation period of 2 seconds
• Magnetar-like Emission from the Young Pulsar in Kes 75
• Resonant cyclotron scattering in magnetars' emission
• Recent Progress on Anomalous X-ray Pulsars
• Evidence for Heating of Neutron Stars by Magnetic Field Decay
• Evidence for precession of the isolated neutron star RX J0720.4-3125
• Constraining the Spin-down of the Nearby Isolated Neutron Star RX J2143.0+0654
• The Origin and Motion of PSR J0538+2817 in S147
• Deep Chandra Observation of the Pulsar Wind Nebula Powered by the Pulsar J1846-0258 in the Supernova Remnant Kes 75
• Chandra Observation of PSR B1823-13 and its Pulsar Wind Nebula
• Using Chandra to Unveil the High-Energy Properties of the High-Magnetic Field Radio Pulsar J1119-6127
• Chandra observations of the pulsar PSR B1929+10 and its environment
• The complex X-ray spectrum of the isolated neutron star RBS1223
• Discovery of extended X-ray emission around the highly magnetic RRAT J1819-1458
• Phase resolved spectroscopy of the Vela pulsar with XMM-Newton
• XMM-Newton X-ray Observation of the High-Magnetic-Field Radio Pulsar PSR J1734--3333
• Dim Isolated Neutron Stars, Cooling and Energy Dissipation