A modified stratified model for the 3C 273 jet
Liu WenPo1; Shen ZhiQiang1
AbstractWe present a modified stratified jet model to interpret the observed spectral energy distributions of knots in the 3C 273 jet. Based on the hypothesis of the single index of the particle energy spectrum at injection and identical emission processes among 0 the knots, the observed difference of spectral shape among different 3C 273 knots can be understood as a manifestation of the deviation of the equivalent Doppler factor of stratified emission regions in an individual knot from a characteristic one. The summed spectral energy distributions of all ten knots in the 3C 273 jet can be well fitted by two components: a low-energy component (radio to optical) dominated by synchrotron radiation and a high-energy component (UV, X-ray and gamma-ray) dominated by inverse Compton scattering of the cosmic microwave background. This gives a consistent spectral index of alpha = 0.88 (S-v proportional to v(-alpha)) and a characteristic Doppler factor of 7.4. Assuming the average of the summed spectrum as the characteristic spectrum of each knot in the 3C 273 jet, we further get a distribution of Doppler factors. We discuss the possible implications of these results for the physical properties in the 3C 273 jet. Future GeV observations with GLAST could separate the gamma-ray emission of 3C 273 from the large scale jet and the small scale jet (i.e. the core) through measuring the GeV spectrum.
KeywordSYNCHROTRON-RADIATION RAY 3C-273 VARIABILITY DIAGNOSTICS EMISSION LIGHT galaxies: active galaxies: individual (3C 273) galaxies: jets radiation mechanisms: non-thermal
Funding Project[National Natural Science Foundation of China] ; [Chinese Academy of Sciences] ; [Shanghai Subject Chief Scientist] ; [National Key Basic Research Development Program of China]
Document Type期刊论文
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Liu WenPo,Shen ZhiQiang. A modified stratified model for the 3C 273 jet[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(5):520.
APA Liu WenPo,&Shen ZhiQiang.(2009).A modified stratified model for the 3C 273 jet.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(5),520.
MLA Liu WenPo,et al."A modified stratified model for the 3C 273 jet".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.5(2009):520.
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