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NICER X-ray observations of seven nearby rotation-powered millisecond pulsars

NICER X-ray observations of seven nearby rotation-powered millisecond pulsars
NICER X-ray observations of seven nearby rotation-powered millisecond pulsars
The Neutron star Interior Composition Explorer observed several rotation-powered millisecond pulsars (MSPs) 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 (≥4.7σ 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 1.7σ and almost 3σ 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 MSPs exhibit a significant phase offset between their X-ray and radio pulses.
2041-8205
Guillot, Sebastien
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Kerr, Matthew
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Ray, Paul S.
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Bogdanov, Slavko
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Ransom, Scott
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Deneva, Julia S.
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Arzoumanian, Zaven
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Bult, Peter
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Chakrabarty, Deepto
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Gendreau, Keith C.
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Ho, Wynn C.G.
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Jaisawal, Gaurava K.
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Malacaria, Christian
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Coleman Miller, M.
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Strohmayer, Tod E.
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Wolff, Michael T.
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Wood, Kent S.
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Webb, Natalie A.
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Guillemot, Lucas
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Cognard, Ismael
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Theureau, Gilles
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Guillot, Sebastien
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Kerr, Matthew
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Ray, Paul S.
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Bogdanov, Slavko
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Ransom, Scott
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Deneva, Julia S.
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Arzoumanian, Zaven
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Bult, Peter
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Chakrabarty, Deepto
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Gendreau, Keith C.
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Ho, Wynn C.G.
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Jaisawal, Gaurava K.
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Malacaria, Christian
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Coleman Miller, M.
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Strohmayer, Tod E.
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Wolff, Michael T.
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Wood, Kent S.
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Webb, Natalie A.
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Guillemot, Lucas
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Cognard, Ismael
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Theureau, Gilles
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Guillot, Sebastien, Kerr, Matthew, Ray, Paul S., Bogdanov, Slavko, Ransom, Scott, Deneva, Julia S., Arzoumanian, Zaven, Bult, Peter, Chakrabarty, Deepto, Gendreau, Keith C., Ho, Wynn C.G., Jaisawal, Gaurava K., Malacaria, Christian, Coleman Miller, M., Strohmayer, Tod E., Wolff, Michael T., Wood, Kent S., Webb, Natalie A., Guillemot, Lucas, Cognard, Ismael and Theureau, Gilles (2019) NICER X-ray observations of seven nearby rotation-powered millisecond pulsars. Astrophysical Journal Letters, 887 (1), [L27]. (doi:10.3847/2041-8213/ab511b).

Record type: Article

Abstract

The Neutron star Interior Composition Explorer observed several rotation-powered millisecond pulsars (MSPs) 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 (≥4.7σ 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 1.7σ and almost 3σ 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 MSPs exhibit a significant phase offset between their X-ray and radio pulses.

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1912.05708 - Accepted Manuscript
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Accepted/In Press date: 9 October 2019
Published date: 12 December 2019

Identifiers

Local EPrints ID: 436759
URI: http://eprints.soton.ac.uk/id/eprint/436759
ISSN: 2041-8205
PURE UUID: 5791e072-35d8-46be-bbbf-05706489b6f2
ORCID for Wynn C.G. Ho: ORCID iD orcid.org/0000-0002-6089-6836

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Date deposited: 03 Jan 2020 17:30
Last modified: 05 Feb 2020 01:30

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Contributors

Author: Sebastien Guillot
Author: Matthew Kerr
Author: Paul S. Ray
Author: Slavko Bogdanov
Author: Scott Ransom
Author: Julia S. Deneva
Author: Zaven Arzoumanian
Author: Peter Bult
Author: Deepto Chakrabarty
Author: Keith C. Gendreau
Author: Wynn C.G. Ho ORCID iD
Author: Gaurava K. Jaisawal
Author: Christian Malacaria
Author: M. Coleman Miller
Author: Tod E. Strohmayer
Author: Michael T. Wolff
Author: Kent S. Wood
Author: Natalie A. Webb
Author: Lucas Guillemot
Author: Ismael Cognard
Author: Gilles Theureau

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