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dc.contributor.authorRowan, Dominick M.
dc.contributor.authorVenter, Christo
dc.contributor.authorGhazi, Zaynab
dc.contributor.authorLugo, Lauren
dc.contributor.authorSpano, Elizabeth
dc.identifier.citationRowan, D.M. et al. 2020. A NICER view of spectral and profile evolution for three x-ray-emitting millisecond pulsars. Astrophysical journal, 892(2): #150. []en_US
dc.identifier.issn1538-4357 (Online)
dc.description.abstractWe present two years of Neutron star Interior Composition Explorer (NICER) X-ray observations of three energetic rotation-powered millisecond pulsars (MSPs): PSRs B1937+21, B1821−24, and J0218+4232. We fit Gaussians and Lorentzians to the pulse profiles for different energy sub-bands of the soft X-ray regime to measure the energy dependence of pulse separation and width. We find that the separation between pulse components of PSR J0218+4232 decreases with increasing energy at >3σ confidence. The 95% upper limit on pulse separation evolution for PSRs B1937+21 and B1821−24 is less than 2 milliperiods per keV. Our phase-resolved spectral results provide updated constraints on the non-thermal X-ray emission of these three pulsars. The photon indices of the modeled X-ray emission spectra for each pulse component of PSR B1937+21 are inconsistent with each other at the 90% confidence level, suggesting different emission origins for each pulse. We find that the PSR B1821−24 and PSR J0218+4232 emission spectra are invariant with phase at the 90% confidence level. We describe the implications of our profile and spectral results in the context of equatorial current sheet emission models for these three MSPs with non-thermal, magnetospheric X-ray emissionen_US
dc.subjectMillisecond pulsarsen_US
dc.subjectNeutron starsen_US
dc.subjectX-ray astronomyen_US
dc.titleA NICER view of spectral and profile evolution for three x-ray-emitting millisecond pulsarsen_US
dc.contributor.researchID12006653 - Venter, Christo

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