天文系A类岗位考核聘任汇报 - 致密天体与弥漫介质研究团组.ppt
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1、Qiao,G.J. Dept. of Astronomy, Peking Univ.Collaborators:Zhang, B.(University of Nevada), Xu, R.X.(PKU), Han,J.L.(NAOC), Lin,W.P.(SHO),Lee,K.J.(PKU)Xia,X.Y.,Radio and Gamma-ray emission of pulsars,Radio and Gamma-ray emission of pulsars,I. Radio emission (Inverse Compton scattering model: ICS )II. In
2、ner annular gap & gamma-ray emission Radio + Gamma ray emissionIII. Pulsar: Neuron stars or Strange stars?,Core beamBeam-frequencyMode changing,Bi-drifting,Gamma-ray,Core gap,Annular gap,Strange stars,Pulsar emission beams,Observations,Emission beams,Rankin, 1983, ApJ,274,333,Theories,Ruderman & Sut
3、herland (RS) Model,Ruderman & Shutherland,1975, ApJ,196,51,Emission beams in RS model,Ruderman & Sutherland, 1975,Emission beams,Hollow cone only!,Obs. & Theory(ICS),(1) Core + Cones (2) Different components come from different locations (3) Pulse profile shapes changing with freq. (4) Mode changing
4、 (5) Bi-drifting Pulsars: NS or Strange stars?,ICS Model: emission beams Core +cones,Qiao, 1992,ICS: shift of emission beams,Different emission locationshift ofthe emission beams,Qiao & Lin, 1998, A&A,333,172,Poln: Beam shiftPA jumps,Xu, Qiao & Han, 1997, AA,Poln: PA jump,Xu, Qiao & Han, 1997, AA,IC
5、S model: inner gap sparking 0,=220(1-Cosi),Qiao & Lin, 1998, A&A,Core beamBeam-frequencyMode changing,Bi-drifting,Gamma-ray,Core gap,Annular gap,Strange stars,RS model,Qiao,Liu, Zhang,& Han, 2001,AA,Lyne & Manchester (1988) & Sieber et al. (1975),Kramer,(1994),“S” shape PA & Obs.,Poln of integrated
6、pulse in ICS,Vcircular poln,LLinear poln,ITotal Intensity,Position angle,Xu,Liu,Han,Qiao, 2000, ApJ,Core beamBeam-frequencyMode changing,Bi-drifting,Gamma-ray,Core gap,Annular gap,Strange stars,Mode changing of pulsars,Rankin, 1986,Zhang,Qiao,Lin,Han, 1997,Tree mode of sparking,Thermal ICS,Curvature
7、 radiation,Resonant ICS,Mode change pulsars,Zhang,Qiao,Lin,Han, 1997,ApJZhang,Qiao, Han, 1997,ApJ,Core beamBeam-frequencyMode changing,Bi-drifting,Gamma-ray,Core gap,Annular gap,Strange stars, Polar cap (polar gap),Basic Observational facts vs Theories,Radio- Gamma-rays: Obs.,Outer gap,Gamma-ray,Rad
8、io,The magnetosphere of a NS,+,Inner annular gap,Inner annular gap,Qiao,Lee,Wang,Xu, Han, 2004a,ApJL,Inner annular gap,Qiao,Lee,Wang,Xu, 2004a, ApJL,Inner Annular Gap,Qiao,Lee,Wang,Xu, 2004a, ApJL,Core beamBeam-frequencyMode changing,Bi-drifting,Gamma-ray,Core gap,Annular gap,Strange stars,Mclaughli
9、n 2003,astr-ph/0310454,Bi-drifting: Obs.,Drifting subpulses,PULSE LONGITUDE,Drifting subpulses,Taylor et al. (1975),Backer (1973),Accelerators:Inner vacuum gap (Ruderman & Sutherland 1975)requiring high binding energy of charges on stellar surface,Drifting sub-pulses,Xu,Qiao Zhang,1999,ApJL,522,L112
10、Deshpannde & Rankin,1999,ApJ, 524,1008,Inner Annular Gap : V= c E x B / B2,Bi-drifting: fitting,Mclaughlin 2003,astr-ph/0310454,Qiao,Lee,Zhang,Xu,Wang,2004b, ApJL,Neutron stars: Binding energy 10 KeV no gap can be formed! Binding energy 10 KeV only one gap cab be formed: core or annular gapStrange s
11、tars: both core & annular gap can be Formed !, Annular Gap mole: different Gamma-ray pulsars can be fitted Pulsars: Strange stars? Observational check: Polarization at high energy bands Theory: two caps=two gap?,Conclusion and discussion,Core beamBeam-frequencyMode changing,Bi-drifting,Gamma-ray,Cor
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- 天文 岗位 考核 考查 聘任 汇报 致密 天体 弥漫 洋溢 介质 研究 钻研
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