2021
DOI: 10.1051/0004-6361/202039774
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Abstract: The radio-quiet pulsar PSR J2021+4026 is mostly known because it is the only rotation-powered pulsar that shows variability in its γ-ray emission. Using XMM-Newton archival data, we first confirmed that its flux is steady in the X-ray band, and then we showed that both the spectral and timing X-ray properties, that is to say the narrow pulse profile, the high pulsed fraction of 80–90%, and its dependence on the energy, can be better reproduced using a magnetized atmosphere model instead of simply a blackbody m… Show more

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Cited by 5 publications
(3 citation statements)
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References 57 publications
(42 reference statements)
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“…The blackbody + power-law fit presented in section 3.4 points to a thermal emission region of radius ∼ 340 m and a luminosity of ∼2.5×10 31 erg s −1 , which matches the predicted polar cap heating luminosity of 10 31 erg s −1 reported in Harding & Muslimov (2001) reasonably well. The measured temperature of the polar cap is higher than we would expect for a cooling neutron star with ∼77 kyr such as PSR J2021+4026 (Rigoselli et al 2021;Potekhin et al 2020). The shift of the X-ray pulse phase by 0.21, if corresponding to the emission coming from one of the magnetic poles, is much larger than the size of a standard polar cap (Page et al 2004).…”
Section: Discussionmentioning
confidence: 71%
See 1 more Smart Citation
“…The blackbody + power-law fit presented in section 3.4 points to a thermal emission region of radius ∼ 340 m and a luminosity of ∼2.5×10 31 erg s −1 , which matches the predicted polar cap heating luminosity of 10 31 erg s −1 reported in Harding & Muslimov (2001) reasonably well. The measured temperature of the polar cap is higher than we would expect for a cooling neutron star with ∼77 kyr such as PSR J2021+4026 (Rigoselli et al 2021;Potekhin et al 2020). The shift of the X-ray pulse phase by 0.21, if corresponding to the emission coming from one of the magnetic poles, is much larger than the size of a standard polar cap (Page et al 2004).…”
Section: Discussionmentioning
confidence: 71%
“…Quadrupole field components can produce polar caps that are larger and more extended that those of a pure dipole field (Gralla et al 2017). Rigoselli et al (2021), using a more complex magnetic atmosphere model to fit the X-ray profile of PSR J2021+4026, find a heated area much larger than dipole. This model could also explain the observed variability in γ -rays.…”
Section: Discussionmentioning
confidence: 99%
“…In order to maximize the signal-to-noise ratio for these generally faint sources, we extracted their EPIC-pn spectra using the maximum likelihood method as described in Rigoselli et al (2019bRigoselli et al ( , 2021. The energy bins are chosen in such a way to have a significant detection, that means at least 50 counts per bin.…”
Section: Analysis Of the Six Unknown Sourcesmentioning
confidence: 99%