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Emitting electron spectra and acceleration processes in the jet of PKS 0447−439
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| Zeitschriftentitel: | Publications of the Astronomical Society of Japan |
|---|---|
| Personen und Körperschaften: | , , , |
| In: | Publications of the Astronomical Society of Japan, 66, 2014, 1 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Oxford University Press (OUP)
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| Schlagwörter: |
| author_facet |
Zhou, Yao Yan, Dahai Dai, Benzhong Zhang, Li Zhou, Yao Yan, Dahai Dai, Benzhong Zhang, Li |
|---|---|
| author |
Zhou, Yao Yan, Dahai Dai, Benzhong Zhang, Li |
| spellingShingle |
Zhou, Yao Yan, Dahai Dai, Benzhong Zhang, Li Publications of the Astronomical Society of Japan Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 Space and Planetary Science Astronomy and Astrophysics |
| author_sort |
zhou, yao |
| spelling |
Zhou, Yao Yan, Dahai Dai, Benzhong Zhang, Li 2053-051X 0004-6264 Oxford University Press (OUP) Space and Planetary Science Astronomy and Astrophysics http://dx.doi.org/10.1093/pasj/pst012 <jats:title>Abstract</jats:title> <jats:p>We investigate the electron energy distributions (EEDs) and the corresponding acceleration processes in the jet of PKS 0447−439, and estimate its redshift through modeling its observed spectral energy distribution (SED) in the frame of a one-zone synchrotron-self Compton (SSC) model. Three EEDs formed in different acceleration scenarios are assumed: the power-law with exponential cut-off (PLC) EED (shock-acceleration scenario or the case of the EED approaching equilibrium in the stochastic-acceleration scenario), the log-parabolic (LP) EED (stochastic-acceleration scenario and the acceleration dominating), and the broken power-law (BPL) EED (no acceleration scenario). The corresponding fluxes of both synchrotron and SSC are then calculated. The model is applied to PKS 0447−439, and modeled SEDs are compared to the observed SED of this object by using the Markov Chain Monte Carlo method. The results show that the PLC model fails to fit the observed SED well, while the LP and BPL models give comparably good fits for the observed SED. The results indicate that it is possible that a stochastic acceleration process acts in the emitting region of PKS 0447−439 and the EED is far from equilibrium (acceleration dominating) or no acceleration process works (in the emitting region). The redshift of PKS 0447−439 is also estimated in our fitting: z = 0.16 ± 0.05 for the LP case and z = 0.17 ± 0.04 for BPL case.</jats:p> Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 Publications of the Astronomical Society of Japan |
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| title |
Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 |
| title_unstemmed |
Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 |
| title_full |
Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 |
| title_fullStr |
Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 |
| title_full_unstemmed |
Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 |
| title_short |
Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 |
| title_sort |
emitting electron spectra and acceleration processes in the jet of pks 0447−439 |
| topic |
Space and Planetary Science Astronomy and Astrophysics |
| url |
http://dx.doi.org/10.1093/pasj/pst012 |
| publishDate |
2014 |
| physical |
|
| description |
<jats:title>Abstract</jats:title>
<jats:p>We investigate the electron energy distributions (EEDs) and the corresponding acceleration processes in the jet of PKS 0447−439, and estimate its redshift through modeling its observed spectral energy distribution (SED) in the frame of a one-zone synchrotron-self Compton (SSC) model. Three EEDs formed in different acceleration scenarios are assumed: the power-law with exponential cut-off (PLC) EED (shock-acceleration scenario or the case of the EED approaching equilibrium in the stochastic-acceleration scenario), the log-parabolic (LP) EED (stochastic-acceleration scenario and the acceleration dominating), and the broken power-law (BPL) EED (no acceleration scenario). The corresponding fluxes of both synchrotron and SSC are then calculated. The model is applied to PKS 0447−439, and modeled SEDs are compared to the observed SED of this object by using the Markov Chain Monte Carlo method. The results show that the PLC model fails to fit the observed SED well, while the LP and BPL models give comparably good fits for the observed SED. The results indicate that it is possible that a stochastic acceleration process acts in the emitting region of PKS 0447−439 and the EED is far from equilibrium (acceleration dominating) or no acceleration process works (in the emitting region). The redshift of PKS 0447−439 is also estimated in our fitting: z = 0.16 ± 0.05 for the LP case and z = 0.17 ± 0.04 for BPL case.</jats:p> |
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| author | Zhou, Yao, Yan, Dahai, Dai, Benzhong, Zhang, Li |
| author_facet | Zhou, Yao, Yan, Dahai, Dai, Benzhong, Zhang, Li, Zhou, Yao, Yan, Dahai, Dai, Benzhong, Zhang, Li |
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| description | <jats:title>Abstract</jats:title> <jats:p>We investigate the electron energy distributions (EEDs) and the corresponding acceleration processes in the jet of PKS 0447−439, and estimate its redshift through modeling its observed spectral energy distribution (SED) in the frame of a one-zone synchrotron-self Compton (SSC) model. Three EEDs formed in different acceleration scenarios are assumed: the power-law with exponential cut-off (PLC) EED (shock-acceleration scenario or the case of the EED approaching equilibrium in the stochastic-acceleration scenario), the log-parabolic (LP) EED (stochastic-acceleration scenario and the acceleration dominating), and the broken power-law (BPL) EED (no acceleration scenario). The corresponding fluxes of both synchrotron and SSC are then calculated. The model is applied to PKS 0447−439, and modeled SEDs are compared to the observed SED of this object by using the Markov Chain Monte Carlo method. The results show that the PLC model fails to fit the observed SED well, while the LP and BPL models give comparably good fits for the observed SED. The results indicate that it is possible that a stochastic acceleration process acts in the emitting region of PKS 0447−439 and the EED is far from equilibrium (acceleration dominating) or no acceleration process works (in the emitting region). The redshift of PKS 0447−439 is also estimated in our fitting: z = 0.16 ± 0.05 for the LP case and z = 0.17 ± 0.04 for BPL case.</jats:p> |
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| imprint_str_mv | Oxford University Press (OUP), 2014 |
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| spelling | Zhou, Yao Yan, Dahai Dai, Benzhong Zhang, Li 2053-051X 0004-6264 Oxford University Press (OUP) Space and Planetary Science Astronomy and Astrophysics http://dx.doi.org/10.1093/pasj/pst012 <jats:title>Abstract</jats:title> <jats:p>We investigate the electron energy distributions (EEDs) and the corresponding acceleration processes in the jet of PKS 0447−439, and estimate its redshift through modeling its observed spectral energy distribution (SED) in the frame of a one-zone synchrotron-self Compton (SSC) model. Three EEDs formed in different acceleration scenarios are assumed: the power-law with exponential cut-off (PLC) EED (shock-acceleration scenario or the case of the EED approaching equilibrium in the stochastic-acceleration scenario), the log-parabolic (LP) EED (stochastic-acceleration scenario and the acceleration dominating), and the broken power-law (BPL) EED (no acceleration scenario). The corresponding fluxes of both synchrotron and SSC are then calculated. The model is applied to PKS 0447−439, and modeled SEDs are compared to the observed SED of this object by using the Markov Chain Monte Carlo method. The results show that the PLC model fails to fit the observed SED well, while the LP and BPL models give comparably good fits for the observed SED. The results indicate that it is possible that a stochastic acceleration process acts in the emitting region of PKS 0447−439 and the EED is far from equilibrium (acceleration dominating) or no acceleration process works (in the emitting region). The redshift of PKS 0447−439 is also estimated in our fitting: z = 0.16 ± 0.05 for the LP case and z = 0.17 ± 0.04 for BPL case.</jats:p> Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 Publications of the Astronomical Society of Japan |
| spellingShingle | Zhou, Yao, Yan, Dahai, Dai, Benzhong, Zhang, Li, Publications of the Astronomical Society of Japan, Emitting electron spectra and acceleration processes in the jet of PKS 0447−439, Space and Planetary Science, Astronomy and Astrophysics |
| title | Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 |
| title_full | Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 |
| title_fullStr | Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 |
| title_full_unstemmed | Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 |
| title_short | Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 |
| title_sort | emitting electron spectra and acceleration processes in the jet of pks 0447−439 |
| title_unstemmed | Emitting electron spectra and acceleration processes in the jet of PKS 0447−439 |
| topic | Space and Planetary Science, Astronomy and Astrophysics |
| url | http://dx.doi.org/10.1093/pasj/pst012 |