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NICER X-ray Observations of Seven Nearby Rotation-Powered Millisecond Pulsars
S. Guillot, M. Kerr, P. S. Ray +18
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 therm…
Constraining the Neutron Star Mass-Radius Relation and Dense Matter Equation of State with NICER. II. Emission from Hot Spots on a Rapidly Rotating Neutron Star
Slavko Bogdanov, Frederick K. Lamb, Simin Mahmoodifar +10
We describe the model of surface emission from a rapidly rotating neutron star that is applied to Neutron Star Interior Composition Explorer X-ray data of millisecond pulsars in or…
Constraining the Neutron Star Mass-Radius Relation and Dense Matter Equation of State with NICER. I. The Millisecond Pulsar X-ray Data Set
Slavko Bogdanov, Sebastien Guillot, Paul S. Ray +27
We present the set of deep Neutron Star Interior Composition Explorer (NICER) X-ray timing observations of the nearby rotation-powered millisecond pulsars PSRs J0437-4715, J0030+04…
PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
M. C. Miller, F. K. Lamb, A. J. Dittmann +18
Neutron stars are not only of astrophysical interest, but are also of great interest to nuclear physicists, because their attributes can be used to determine the properties of the…
A NICER view of PSR J0030+0451: evidence for a global-scale multipolar magnetic field
Anna V. Bilous, Anna L. Watts, Alice K. Harding +8
Recent modeling of NICER observations of thermal X-ray pulsations from the surface of the isolated millisecond pulsar PSR J0030+0451 suggests that the hot emitting regions on the p…
A NICER view of PSR J0030+0451: Implications for the dense matter equation of state
G. Raaijmakers, T. E. Riley, A. L. Watts +14
Both the mass and radius of the millisecond pulsar PSR J0030+0451 have been inferred via pulse-profile modeling of X-ray data obtained by NASA's NICER mission. In this Letter we st…
A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
Thomas E. Riley, Anna L. Watts, Slavko Bogdanov +13
We report on Bayesian parameter estimation of the mass and equatorial radius of the millisecond pulsar PSR J00300451, conditional on pulse-profile modeling of Neutron Star Inter…
Constraining the dense matter equation of state with joint analysis of NICER and LIGO/Virgo measurements
G. Raaijmakers, S. K. Greif, T. E. Riley +8
The NICER collaboration recently published a joint estimate of the mass and the radius of PSR J0030+0451, derived via X-ray pulse-profile modeling. Raaijmakers et al. (2019) explor…
Timing the pulsations of the accreting millisecond pulsar SAX J1808.4-3658 during its 2019 outburst
Peter Bult, Deepto Chakrabarty, Zaven Arzoumanian +5
In this paper we present a coherent timing analysis of the 401 Hz pulsations of the accreting millisecond X-ray pulsar SAX J1808.4-3658 during its 2019 outburst. Using observations…
The SUrvey for Pulsars and Extragalactic Radio Bursts IV: Discovery and polarimetry of a 12.1-second radio pulsar
V. Morello, E. F. Keane, T. Enoto +19
We report the discovery of PSR~J22513711, a radio pulsar with a spin period of 12.1 seconds, the second longest currently known. Its timing parameters imply a characteristic age…
An evolving broad iron line from the first Galactic ultraluminous X-ray pulsar Swift J0243.6+6124
Gaurava K. Jaisawal, Colleen A. Wilson-Hodge, Andrew C. Fabian +15
We present a spectral study of the ultraluminous Be/X-ray transient pulsar Swift J0243.6+6124 using Neutron Star Interior Composition Explorer (NICER) observations during the syste…
A NICER thermonuclear burst from the millisecond X-ray pulsar SAX J1808.4-3658
Peter Bult, Gaurava K. Jaisawal, Tolga Güver +9
The Neutron Star Interior Composition Explorer (NICER) has extensively monitored the August 2019 outburst of the 401 Hz millisecond X-ray pulsar SAX J1808.4-3658. In this Letter, w…
NICER observes a secondary peak in the decay of a thermonuclear burst from 4U 1608-52
Gaurava K. Jaisawal, Jérôme Chenevez, Peter Bult +14
We report for the first time below 1.5 keV, the detection of a secondary peak in an Eddington-limited thermonuclear X-ray burst observed by the Neutron Star Interior Composition Ex…
NICER Observation of Unusual Burst Oscillations in 4U 1728-34
Simin Mahmoodifar, Tod E. Strohmayer, Peter Bult +9
The Neutron Star Interior Composition Explorer (NICER) has observed seven thermonuclear X-ray bursts from the Low Mass X-ray Binary (LMXB) neutron star 4U 1728-34 from the start of…
Observations of the Ultra-compact X-ray Binary 4U 1543-624 in Outburst with NICER, INTEGRAL, Swift, and ATCA
R. M. Ludlam, L. Shishkovsky, P. M. Bult +17
We report on X-ray and radio observations of the ultra-compact X-ray binary 4U 1543-624 taken in August 2017 during an enhanced accretion episode. We obtained NICER monitoring of t…
Thermal X-ray emission identified from the millisecond pulsar PSR J1909-3744
N. A. Webb, D. Leahy, S. Guillot +5
Pulsating thermal X-ray emission from millisecond pulsars can be used to obtain constraints on the neutron star equation of state, but to date only five such sources have been iden…
A joint NICER and XMM-Newton view of the "Magnificent" thermally emitting X-ray Isolated Neutron Star RX J1605.3+3249
Christian Malacaria, Slavko Bogdanov, Wynn C. G. Ho +9
Thermally emitting X-ray isolated neutron stars represent excellent targets for testing cooling surface emission and atmosphere models, which are used to infer physical parameters…
NICER Discovers Spectral Lines During Photospheric Radius Expansion Bursts from 4U 1820-30: Evidence for Burst-driven Winds
T. E. Strohmayer, D. Altamirano, Z. Arzoumanian +14
We report the discovery with the Neutron Star Interior Composition Explorer (NICER) of narrow emission and absorption lines during photospheric radius expansion (PRE) X-ray bursts…
Discovery of Soft X-ray Pulsations from PSR J1231-1411 using NICER
Paul S. Ray, Sebastien Guillot, Scott M. Ransom +10
We report the discovery of soft X-ray pulsations from the nearby millisecond pulsar PSR J12311411 using NICER. The pulsed emission is characterized by a broad and asymmetric mai…
NICER Observations of the 2018 Outburst of XTE J1810-197
Tolga Guver, Ersin Gogus, Eda Vurgun +9
We present the earliest available soft X-ray observations of XTE J1810-187, the prototypical transient magnetar, obtained 75--84 days after its 2018 outburst with the Neutron Star…
New constraints on the nuclear equation of state from the thermal emission of neutron stars in quiescent low-mass X-ray binaries
N. Baillot d'Etivaux, S. Guillot, J. Margueron +3
This paper presents a new analysis of the thermal emission from the neutron star surface to constrain the dense matter equation of state. It is based on the use of a Markov-Chain M…
On the curious pulsation properties of the accreting millisecond pulsar IGR J17379-3747
Peter Bult, Craig B. Markwardt, Diego Altamirano +7
We report on the Neutron Star Interior Composition Explorer (NICER) monitoring campaign of the 468 Hz accreting millisecond X-ray pulsar IGR J17379-3747. From a detailed spectral a…
Neutron star radius measurement from the ultraviolet and soft X-ray thermal emission of PSR J0437-4715
Denis Gonzalez-Caniulef, Sebastien Guillot, Andreas Reisenegger
We analyzed the thermal emission from the entire surface of the millisecond pulsar PSR J0437-4715 observed in the ultraviolet and soft X-ray bands. For this, we calculated non-magn…
The Physics of Accretion Onto Highly Magnetized Neutron Stars
Michael T. Wolff, Peter A. Becker, Joel Coley +16
Studying the physical processes occurring in the region just above the magnetic poles of strongly magnetized, accreting binary neutron stars is essential to our understanding of st…