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The NuSTAR view of the non-thermal emission from PSR J0437-4715
High Energy Astrophysical Phenomena · Submitted 12 Dec 2015
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We performed a simultaneous spectral analysis of the XMM-Newton and NuSTAR data to confirm that three thermal components and a power law are required to fit the 0.3-20 keV emission of PSR J0437-4715.
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We present a hard X-ray NuSTAR observation of PSR J0437-4715, the nearest millisecond pulsar. The known pulsations at the apparent pulse period ~5.76 ms are detected at energies up to 20 keV. We measure a photon index $\Gamma= 1.65\pm0.24$ (90% confidence) for the power law fit to the non-thermal emission. It had been shown that spectral models with two or three thermal components fit the XMM-Newton spectrum of PSR J0437-4715, depending on the slope of the power-law component, and the amount of absorption of soft X-rays. The new constraint on the high-energy emission provided by NuSTAR removes ambiguities regarding the thermal components of the emission below 3 keV. We performed a simultaneous spectral analysis of the XMM-Newton and NuSTAR data to confirm that three thermal components and a power law are required to fit the 0.3-20 keV emission of PSR J0437-4715. Adding a ROSAT-PSPC spectrum further confirmed this result and allowed us to better constrain the temperatures of the three thermal components. A phase-resolved analysis of the NuSTAR data revealed no significant change in the photon index of the high-energy emission. This NuSTAR observation provides further impetus for future observations with the NICER mission (Neutron Star Interior Composition Explorer) whose sensitivity will provide much stricter constraints on the equation of state of nuclear matter by combining model fits to the pulsar's phase-folded lightcurve with the pulsar's well-defined mass and distance from radio timing observations.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present a hard X-ray NuSTAR observation of PSR J0437-4715, the nearest millisecond pulsar. | contribution 0.98 | 0.95 | 0.04 | asserted 0.99 |
| s1 | The known pulsations at the apparent pulse period ~5.76 ms are detected at energies up to 20 keV. | result 1.00 | 0.84 | 0.06 | asserted 1.00 |
| s2 | We measure a photon index $\Gamma= 1.65\pm0.24$ (90% confidence) for the power law fit to the non-thermal emission. | result 1.00 | 0.97 | 0.14 | asserted 1.00 |
| s3 | It had been shown that spectral models with two or three thermal components fit the XMM-Newton spectrum of PSR J0437-4715, depending on the slope of the power-law component, and the amount of absorption of soft X-rays. | background 0.96 | 0.04 | 0.04 | asserted 0.98 |
| s4 | The new constraint on the high-energy emission provided by NuSTAR removes ambiguities regarding the thermal components of the emission below 3 keV. | interpretation 0.69 | 0.52 | 0.31 | asserted 0.99 |
| s5 | We performed a simultaneous spectral analysis of the XMM-Newton and NuSTAR data to confirm that three thermal components and a power law are required to fit the 0.3-20 keV emission of PSR J0437-4715. | result 0.58 | 0.97 | 0.59 | asserted 1.00 |
| s6 | Adding a ROSAT-PSPC spectrum further confirmed this result and allowed us to better constrain the temperatures of the three thermal components. | result 0.57 | 0.91 | 0.09 | asserted 1.00 |
| s7 | A phase-resolved analysis of the NuSTAR data revealed no significant change in the photon index of the high-energy emission. | result 1.00 | 0.96 | 0.08 | asserted 1.00 |
| s8 | This NuSTAR observation provides further impetus for future observations with the NICER mission (Neutron Star Interior Composition Explorer) whose sensitivity will provide much stricter constraints on the equation of state of nuclear matter by combining model fits to the pulsar's phase-folded lightcurve with the pulsar's well-defined mass and distance from radio timing observations. | future work 0.98 | 0.12 | 0.09 | asserted 0.58 |
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Original abstract
We present a hard X-ray NuSTAR observation of PSR J0437-4715, the nearest millisecond pulsar. The known pulsations at the apparent pulse period ~5.76 ms are detected at energies up to 20 keV. We measure a photon index $\Gamma= 1.65\pm0.24$ (90% confidence) for the power law fit to the non-thermal emission. It had been shown that spectral models with two or three thermal components fit the XMM-Newton spectrum of PSR J0437-4715, depending on the slope of the power-law component, and the amount of absorption of soft X-rays. The new constraint on the high-energy emission provided by NuSTAR removes ambiguities regarding the thermal components of the emission below 3 keV. We performed a simultaneous spectral analysis of the XMM-Newton and NuSTAR data to confirm that three thermal components and a power law are required to fit the 0.3-20 keV emission of PSR J0437-4715. Adding a ROSAT-PSPC spectrum further confirmed this result and allowed us to better constrain the temperatures of the three thermal components. A phase-resolved analysis of the NuSTAR data revealed no significant change in the photon index of the high-energy emission. This NuSTAR observation provides further impetus for future observations with the NICER mission (Neutron Star Interior Composition Explorer) whose sensitivity will provide much stricter constraints on the equation of state of nuclear matter by combining model fits to the pulsar's phase-folded lightcurve with the pulsar's well-defined mass and distance from radio timing observations.
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Measurements of the NS radii are crucial to determine their interior properties, and study the behavior of dense nuclear matter [ref] .
Astrophysical Constraints on Dense Matter in Neutron Stars · Introduction · 0.92
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