1. Synchro-Curvature Self Compton Radiation
Bo Zhang & Zi-Gao Dai
Department of Astronomy, Nanjing University

2. Outline Background Basic scheme & equations Sample results Conclusions
2019/7/14
Kyoto 2010

3. Background “Traditional” high energy radiation mechanisms:
Synchrotron radiation
Curvature radiation
Inverse Compton scattering
On synchro-curvature radiation:
Proposed by Cheng & Zhang in mid-1990s (e.g. Cheng & Zhang 1996)
Electrons moving around curved field lines
Synchrotron and curvature radiations as two limits
Already be applied to pulsars & GRBs
2019/7/14
Kyoto 2010

4. Basic Schemes of Magnetic Fields
Synchrotron radiation
Curvature radiation
Synchro-curvature radiation and corresponding self Compton scattering B B
2019/7/14
Kyoto 2010

5. Basic Equations Synchro-curvature seed spectrum:
Self Compton scattering:
2019/7/14
Kyoto 2010

6. Basic Assumptions Circular magnetic field
Spiral trajectory around circular field lines
Guiding center on field lines
Decrease of velocity ignored
Drifts of electrons ignored
Isotropic distribution of electrons
2019/7/14
Kyoto 2010

7. Calculation Results
p=5
p=2.5
2019/7/14
Kyoto 2010

8. Results With Cooling Effects
Fast cooling
Slow cooling
2019/7/14
Kyoto 2010

9. Results With KN Cutoff Considered
2019/7/14
Kyoto 2010

10. Conclusions
The synchro-curvature self Compton emission could differ from SSC radiation in Thompson regime
Larger p, larger deviation
Cooling effects may change the resulting spectrum
KN cutoff may make the deviation between SSC and synchro-curvature self Compton smaller
2019/7/14
Kyoto 2010

11. Possible Applications
High energy radiation from pulsars, AGNs, etc…
GRBs?
Synchro-curvature radiation already be used to interpret high energy turnoffs
High energy turnoff as well as cutoff? (e.g. GRB A, see Ohno’s talk)
Problem: Large p required; physics of particle acceleration?
GRB
GRB
Deng et al. 2005
2019/7/14
Kyoto 2010