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The braking index of PSR B0540-69 and the associated pulsar wind nebula emission after spin-down rate transition 期刊论文 OAI收割
Monthly Notices of the Royal Astronomical Society, 2020, 卷号: 494, 页码: 1865-1870
作者: HXMT

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stars: magnetic field stars: neutron pulsars: general Astrophysics - High Energy Astrophysical Phenomena Abstract: In 2011 December, PSR B054-69 experienced a spin-down rate transition (SRT), after which the spin-down power of the pulsar increased by $\sim 36{{\ \rm per\ cent}}$. About 1000 d after the SRT, the X-ray luminosity of the associated pulsar wind nebula (PWN) was found to brighten by $32\pm 8{{\ \rm per\ cent}}$. After the SRT, the braking index n of PSR B0540-69 changes from n = 2.12 to 0.03 and then keeps this value for about five years before rising to n = 0.9 in the following years. We find that most of the current models have difficulties in explaining the measured braking index. One exceptive model of the braking index evolution is the increasing dipole magnetic field of PSR B0540-69. We suggest that the field increase may result from some instabilities within the pulsar core that enhance the poloidal component at the price of toroidal component of the magnetic field. The increasing dipole magnetic field will result in the X-ray brightening of the PWN. We fit the PWN X-ray light curve by two models: one assumes a constant magnetic field within the PWN during the brightening and the other assumes an enhanced magnetic field proportional to the energy density of the PWN. It appears that the two models fit the data well, though the later model seems to fit the data a bit better. This provides marginal observational evidence that magnetic field in the PWN is generated by the termination shock. Future high-quality and high-cadence data are required to draw a solid conclusion.

Insight-HXMT observations of Swift J0243.6+6124: the evolution of RMS pulse fractions at super-Eddington luminosity 期刊论文 OAI收割
Monthly Notices of the Royal Astronomical Society, 2020, 卷号: 497, 页码: 5498-5506
作者: HXMT

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stars: neutron pulsars: individual: Swift J0243.6+6124 X-rays: binaries Astrophysics - High Energy Astrophysical Phenomena Abstract: Based on Insight-HXMT data, we report on the pulse fraction evolution during the 2017-2018 outburst of the newly discovered first Galactic ultraluminous X-ray (ULX) source Swift J0243.6+6124. The pulse fractions of 19 observation pairs selected in the rising and fading phases with similar luminosity are investigated. The results show a general trend of the pulse fraction increasing with luminosity and energy at supercritical luminosity. However, the relative strength of the pulsation between each pair evolves strongly with luminosity. The pulse fraction in the rising phase is larger at luminosity below 7.71 × 10³⁸ erg s^-1, but smaller at above. A transition luminosity is found to be energy independent. Such a phenomenon is first confirmed by Insight-HXMT observations and we speculate that it may have relation with the radiation-pressure-dominated accretion disc.

Unifying neutron star sub-populations in the supernova fallback accretion model 期刊论文 iSwitch采集
Research in astronomy and astrophysics, 2019, 卷号: 19, 期号: 3, 页码: 12
作者: Liu, Bai-Sheng; Li, Xiang-Dong

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Accretion, accretion disks Stars: neutron, evolution, rotation, magnetic field, magnetars Pulsars: general

Unifying neutron star sub-populations in the supernova fallback accretion model 期刊论文 iSwitch采集
Research in astronomy and astrophysics, 2019, 卷号: 19, 期号: 3, 页码: 12
作者: Liu, Bai-Sheng; Li, Xiang-Dong

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Accretion, accretion disks Stars: neutron, evolution, rotation, magnetic field, magnetars Pulsars: general

Pulse phase-resolved analysis of smc x-3 during its 2016-2017 super-eddington outburst 期刊论文 iSwitch采集
Astrophysics and space science, 2018, 卷号: 363, 期号: 2, 页码: 6
作者: Zhao, Hai-Hui; Weng, Shan-Shan; Ge, Ming-Yu; Bian, Wei-Hao; Yuan, Qi-Rong

收藏 | 浏览/下载：31/0 | 提交时间：2019/04/23

Accretion, accretion disks Stars: neutron Pulsars: general X-rays: binaries X-rays: individual (smc x-3)

A Pulsar Wind Nebula Model Applied to Short GRB 050724 期刊论文 OAI收割
ASTROPHYSICAL JOURNAL, 2018, 卷号: 855, 期号: 1, 页码: 67
作者: Lin, WL; Dai, ZG; Wang, LJ; Wang LJ(王灵俊)

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收藏 | 浏览/下载：18/0 | 提交时间：2019/09/24

gamma-ray burst: general radiation mechanisms: non-thermal stars: neutron

The minimum magnetic field of millisecond pulsars calculated according to accretion: application to the X-ray neutron star SAX J1808.4-3658 in a low-mass X-ray binary 期刊论文 OAI收割
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2018, 卷号: 480, 期号: 1, 页码: 692-696
作者: Pan, YY; Zhang, CM; Song LM(宋黎明); Yang, YY; Song, LM

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收藏 | 浏览/下载：29/0 | 提交时间：2019/09/24

stars: neutron < stars X-rays: binaries (stars): pulsars: general accretion, accretion discs

Pulse phase-resolved analysis of SMC X-3 during its 2016-2017 super-Eddington outburst 期刊论文 OAI收割
ASTROPHYSICS AND SPACE SCIENCE, 2018, 卷号: 363, 期号: 2, 页码: 21
作者: Weng, SS; Ge MY(葛明玉); Yuan, QR; Bian, WH; Ge, MY

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收藏 | 浏览/下载：13/0 | 提交时间：2019/09/24

Accretion, accretion disks Stars: neutron Pulsars: general X-rays: binaries X-rays: individual (SMC X-3)

Swift? observations of smc x-3 during its 2016–2017 super-eddington outburst 期刊论文 iSwitch采集
The astrophysical journal, 2017, 卷号: 843, 期号: 1
作者: Weng,Shan-Shan

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Accretion, accretion disks Pulsars: general Stars: neutron X-rays: binaries X-rays: individual (smc x-3)

The optical/uv excess of x-ray-dim isolated neutron stars. i. bremsstrahlung emission from a strangeon star atmosphere 期刊论文 iSwitch采集
The astrophysical journal, 2017, 卷号: 837, 期号: 1
作者: Wang,Weiyang; Lu,Jiguang; Tong,Hao; Ge,Mingyu; Li,Zhaosheng

收藏 | 浏览/下载：31/0 | 提交时间：2019/04/23

Elementary particles Pulsars: general Radiation mechanisms: general Stars: atmospheres Stars: neutron