Gamma-Ray Burst Ring-shaped Jets And Their Afterglows Ming Xu Department of Astronomy, Nanjing University 2010.06.22 Gamma-ray Sky from Fermi: Neutron.

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Presentation transcript:

Gamma-Ray Burst Ring-shaped Jets And Their Afterglows Ming Xu Department of Astronomy, Nanjing University Gamma-ray Sky from Fermi: Neutron Stars and their Environment—Hong Kong Collaborators: Yongfeng Huang, Siwei Kong

Outline GRB jets Structure of ring-shaped jets Afterglows of ring-shaped jets Early rebrightening from ring-shaped jet Conclusions 2

Gamma-Ray Burst 3 Gamma-ray bursts are short and intense unpredictable flashes of gamma-ray photons.

Light curve of GRB-complicated Millisecond Stellar scale 4 Center star

Peculiar properties of GRB High redshiftGRB z=8.2 Nearby GRBGRB z= High luminosityGRB L iso =2.2×10 54 erg/s “Naked GRB”GRB Bm V =5.3 Ultra-relativisticGRB Γ>1200 High engrgy photonGRB Bhν=33.4 GeV Huge isotropic energyGRB CE iso =5.6×10 54 ergs 5

M ⊙ c 2 =1.8×10 54 ergs GRBsIsotropic energy (ergs) GRB E iso =2.8×10 54 ergs GRB E iso =1.8×10 54 ergs GRB E iso =1.2×10 54 ergs GRB BE iso =1.3×10 54 ergs GRB E iso =1.9×10 54 ergs GRB CE iso =5.6×10 54 ergs GRB E iso =4.1×10 54 ergs GRB E iso =1.1×10 54 ergs Amati 08,09,10; Ghirlanda 08,09,10 E iso VS M ⊙ c 2 6 Stellar scale

1. GRB Jets 7

GRB Jet Beaming Angle Gao & Dai 2010 ~ 3.4° f -1 ~ Intrinsic energy

GRB Jet Models Uniform jet (UJ) Universal structured jet (USJ) Cylindrical jet (CJ) Gaussian jet (GJ) Two-component jet (TCJ) “Fan” shaped jet (FSJ) “Ring” shaped jet (RSJ) 9 θ jet

GRB Jet Models Uniform jet Universal structured jet Cylindrical jet Gaussian jet Two-component jet “Ring” shaped jet “Fan” shaped jet 10 jet Most familiar

GRB Jet Models Uniform jet Universal structured jet Cylindrical jet Gaussian jet Two-component jet “Ring” shaped jet “Fan” shaped jet 11 Not uniform

GRB Jet Models Uniform jet Universal structured jet Cylindrical jet Gaussian jet Two-component jet “Ring” shaped jet “Fan” shaped jet 12 jet

GRB Jet Models Uniform jet Universal structured jet Cylindrical jet Gaussian jet Two-component jet “Ring” shaped jet “Fan” shaped jet 13 jet

GRB Jet Models Uniform jet Universal structured jet Cylindrical jet Gaussian jet Two-component jet “Ring” shaped jet “Fan” shaped jet 14 jet narro w wide

GRB Jet Models Uniform jet Universal structured jet Cylindrical jet Gaussian jet Two-component jet “Fan” shaped jet “Ring” shaped jet 15 jet

GRB Jet Models Uniform jet Universal structured jet Cylindrical jet Gaussian jet Two-component jet “Fan” shaped jet “Ring” shaped jet 16 ring hollow

Granot 2005 GRB Jet Models 17

2. GRB ring-shaped Jets If GRB jet axis is precessing around the spin axis, there may be produced a ring-shaped jet. Fargion et al

Aloy & Rezzolla 2006 Mizuno et al Quasi ring-shaped Jet 19

Sketch of ring-shaped jet Xu et al. 2008a 20

Evolution of a ring-shaped jet Xu et al. 2008a 21 Inner edge Outer edge RSJ

Evolution of a ring-shaped jet Xu et al. 2008a 22 Inner edge Outer edge UJ

Evolution of a ring-shaped jet 23 ISM Afterglows ring

3. Afterglow light curves of ring-shaped jet Xu et al. 2008a 24 ring UJ Line of sight on ring

Effect of parameters on LC (1) Xu et al. 2008a 25 magnetic energy fractionelectronic energy fraction opening angle of the central cone observing angle

Effect of parameters on LC (2) Xu et al. 2008a 26 Number density of ISMpower-low index of electron energy distribution

Afterglows LC of ring-shaped jet Xu et al. 2008a X-ray band Radio (8.5Ghz) band 27

R-band Fit to afterglow of GRB A Xu et al. 2008b 28

4. Rebrightening from ring-shaped jet Xu et al. 2008a On the ring In hollow cone 29

Rebrightening VS Flare Chincarini et al. 2007Margutti et al >1 30 GRB t Δt

Rebrightening from off-axis model Margutti et al GRB Line of sight Prompt emission?

Early rebrightening of GRB

Compare to off-axis conical jet Line of sight The ring-shaped jet model is superior over the normal off-axis conical jet model when considering the production of the intensive γ-ray radiation in the prompt GRB phase. 33

Xu & Huang 2010 Early rebrightenings from ring-shaped jets 34 Line of sight in the central axis of hollow cone

Afterglow LC similar to conical jet Effect of parameters on LC Early rebrightenings of GRB afterglow may be resulted from ring-shaped jets Conclusions 35 Thank you!