Neutron Star Interior Composition Explorer X-Ray Timing of the Radio and gamma-Ray Quiet Pulsars PSR J1412+7922 and PSR J1849-0001

Slavko Bogdanov*, Wynn C. G. Ho, Teruaki Enoto, Sebastien Guillot, Alice K. Harding, Gaurava K. Jaisawal, Christian Malacaria, Sridhar S. Manthripragada, Zaven Arzoumanian, Keith C. Gendreau

*Corresponding author for this work

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Abstract

We present new timing and spectral analyses of PSR J1412+7922 (Calvera) and PSR J1849-0001, which are only seen as pulsars in X-rays, based on observations conducted with the Neutron Star Interior Composition Explorer. We obtain updated and substantially improved pulse ephemerides compared to previous X-ray studies, as well as spectra that can be well fit by simple blackbodies and/or a power law. Our refined timing measurements enable deeper searches for pulsations at other wavelengths and sensitive targeted searches by the Laser Interferometer Gravitational-Wave Observatory (LIGO)/Virgo for continuous gravitational waves from these neutron stars. Using the sensitivity of LIGO' s first observing run, we estimate constraints that a gravitational wave search of these pulsars would be obtained on the size of their mass deformation and r-mode fluid oscillation.
Original languageEnglish
Article number69
JournalAstrophysical Journal
Volume877
Issue number2
Number of pages8
ISSN0004-637X
DOIs
Publication statusPublished - 2019

Keywords

  • Gravitational waves
  • Pulsars: general
  • Pulsars: individual (PSR J1412+7922, PSR J1849-0001)
  • Stars: neutron
  • X-rays: stars

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