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

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 (NICER). 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 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 obtain on the size of their mass deformation and r-mode fluid oscillation.

12 pages, 4 figures; submitted to the Astrophysical Journal

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Cited by in corpus (10)

• Thermal luminosities of cooling neutron stars
• Timing six energetic rotation-powered X-ray pulsars, including the fast-spinning young PSR J0058-7218 and Big Glitcher PSR J0537-6910
• Search for continuous gravitational waves from ten H.E.S.S. sources using a hidden Markov model
• NICER study of pulsed thermal X-rays from Calvera: a neutron star born in the Galactic halo?
• Fermi-LAT detection of G118.4+37.0: a supernova remnant in the Galactic halo seen around the Calvera pulsar
• Discovery of two promising isolated neutron star candidates in the SRG/eROSITA All-Sky Survey
• Phase resolved spectrum of the Crab pulsar from NICER
• New upper limits on low-frequency radio emission from isolated neutron stars with LOFAR
• Detection of the extended $\gamma$-ray emission from the high Galactic latitude Calvera's SNR candidate
• Chandra X-ray Observations of PSR J1849-0001, its Pulsar Wind Nebula, and the TeV Source HESS J1849-000