NICER X-ray Observations of Seven Nearby Rotation-Powered Millisecond Pulsars

Abstract

NICER observed several rotation-powered millisecond pulsars to search for or confirm the presence of X-ray pulsations. When broad and sine-like, these pulsations may indicate thermal emission from hot polar caps at the magnetic poles on the neutron star surface. We report confident detections ($\ge 4.7\sigma$ after background filtering) of X-ray pulsations for five of the seven pulsars in our target sample: PSR J0614-3329, PSR J0636+5129, PSR J0751+1807, PSR J1012+5307, and PSR J2241-5236, while PSR J1552+5437 and PSR J1744-1134 remain undetected. Of those, only PSR J0751+1807 and PSR J1012+5307 had pulsations previously detected at the 1.7$\sigma$ and almost 3$\sigma$ confidence levels, respectively, in XMM-Newton data. All detected sources exhibit broad sine-like pulses, which are indicative of surface thermal radiation. As such, these MSPs are promising targets for future X-ray observations aimed at constraining the neutron star mass-radius relation and the dense matter equation of state using detailed pulse profile modeling. Furthermore, we find that three of the detected millisecond pulsars exhibit a significant phase offset between their X-ray and radio pulses.

25 pages, 11 tables, 4 figures. In press in The Astrophysical Journal Letters

References in corpus (26)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• TEMPO2, a new pulsar timing package. I: Overview
• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• PSRCHIVE and PSRFITS An Open Approach to Radio Pulsar Data Storage and Analysis
• Astrophysical Measurement of the Equation of State of Neutron Star Matter
• The Green Bank Northern Celestial Cap Pulsar Survey - I: Survey Description, Data Analysis, and Initial Results
• Constraining the Neutron Star Mass-Radius Relation and Dense Matter Equation of State with NICER. I. The Millisecond Pulsar X-ray Data Set
• Three Millisecond Pulsars in FERMI LAT Unassociated Bright Sources
• Improved Mass and Radius Constraints for Quiescent Neutron Stars in Omega Cen and NGC 6397
• A NICER view of PSR J0030+0451: evidence for a global-scale multipolar magnetic field
• Chandra X-Ray Observations of Nineteen Millisecond Pulsars in the Globular Cluster 47 Tucanae
• Constraints on Neutron Star Properties from X-ray Observations of Millisecond Pulsars
• Constraining the equation of state of supra-nuclear dense matter from XMM-Newton observations of neutron stars in globular clusters
• A Survey of 56 Mid-latitude EGRET Error Boxes for Radio Pulsars
• Thermal X-rays from Millisecond Pulsars: Constraining the Fundamental Properties of Neutron Stars
• Extreme Scattering Events Towards Two Young Pulsars
• A Chandra Look at the X-ray Faint Millisecond Pulsars in the Globular Cluster NGC 6752
• High-Precision X-ray Timing of Three Millisecond Pulsars with NICER: Stability Estimates and Comparison with Radio
• X-ray emission from the planet pulsar B1257+12
• Discovery of Soft X-ray Pulsations from PSR J1231-1411 using NICER
• A millisecond pulsar discovery in a survey of unidentified Fermi $\gamma$-ray sources with LOFAR
• The ultracool helium-atmosphere white dwarf companion of PSR J0740+6620?
• A multi-wavelength study of nearby millisecond pulsar PSR J1400$-$1431: improved astrometry & an optical detection of its cool white dwarf companion
• Thermal X-ray emission identified from the millisecond pulsar PSR J1909-3744

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