1. 李兆升 (徐仁新 代实 郭彦君 仝号 冯骅) 北京大学
孤立中子星的XTP模拟
李兆升
(徐仁新 代实 郭彦君 仝号 冯骅)
北京大学

2. AXP/SGR
Low-field magnetars
CCO
Tong & Xu (2014)

3. Mereghetti (2008)

4. Outline 1 Non-thermal Polarization AXP/SGR Strong magentic field ?
2 AXP/SGR (Magnetar)
4U Small glitch or Anti-glitch?
SGR Free Precession?
3 CCO (Anti-magnetar)
Cas A Period & Pulse Profile
1E Absorption lines(2.1 keV & 2.8 keV?)

5. Non-thermal Polarization
NS-atomsphere ( cm)
thermal x-ray photons
X-mode & O-mode
X-mode dominant!
Lai & Ho 2003

6. Resonant Cyclotron Scattering
Twisted magnetosphere
Absorption plus re-emission  Scattering
Thompson et al. 2002

7. thermal & non-thermal
Rea et al. 2008

8. Polarization RCS X-mode retain its initial polarization state.
O-mode -> X-mode
Taverna et al. 2013

9. QED (vacuum polarization)
Fernandez et al.2011

10. Phase-resolved polarization

11. Fernandez et al.2011

12. Taverna et al. 2013

13. Taverna et al. 2013
XIPE

14. 40 ks

16. GEM/XTP Obs. Time estimation
Linear Pol. 3σ
40% 2-4 keV
20% keV
Pol. Angle 10 deg

17. 自转频率误差估计
Pulse Profile
SGR 4U

19. 4U
Anti-glitch or Small glitch?
2ks/2 weeks

20. SGR
Free precession?
(Thompson et al. 2000)
2ks/3 weeks

21. 1E 1207.4-5209 Cyclotron absorption lines 2BB*absorption
(Sanwal et al. 2002)

25. Cas A 1% pulse fraction & sinusoidal profile & P=0.1s
The 3σ upper limits on the pulsed fraction are ~13% for P>0.3s and 7% for P>3 s (Mereghetti et al. 2002)
1% pulse fraction & sinusoidal profile & P=0.1s
~3σ
>10σ

26. Results AXP/SGR linear polarization 1E 1207.4-5209 Cas A 4U 0142+61
1% pulse fraction & sinusoidal profile
10ks >10σ