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Lorentz Factor Evolution Patterns within Relativistic Jets of GRBs and AGNs

Published online by Cambridge University Press:  23 June 2017

Hai-Ming Zhang
Affiliation:
Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science & Technology, Guangxi University, Nanning 530004, China GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004, China
Da-Bin Lin*
Affiliation:
Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science & Technology, Guangxi University, Nanning 530004, China GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004, China
Ting-Ting Lin
Affiliation:
Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science & Technology, Guangxi University, Nanning 530004, China GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004, China
Bao-Rong Liu
Affiliation:
Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science & Technology, Guangxi University, Nanning 530004, China GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004, China
Xiao-Li Huang
Affiliation:
Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science & Technology, Guangxi University, Nanning 530004, China GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004, China
Shu-Qing Zhong
Affiliation:
Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science & Technology, Guangxi University, Nanning 530004, China GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004, China
Rui-Jing Lu
Affiliation:
Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science & Technology, Guangxi University, Nanning 530004, China GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004, China
En-Wei Liang*
Affiliation:
Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science & Technology, Guangxi University, Nanning 530004, China GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004, China
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Abstract

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The Lorentz factor (Γ) is an important parameter related to the relativistic jet physics. We study the evolution patterns of Γ within gamma-ray burst (GRB) and active galactic nuclear jets for individual GRB 090168, GRB 140508A, and 3C 454.3. By estimating the Γ values for well-separated pulses in GRBs 090618 and 140508A with an empirical relation derived from typical GRBs, we find that the Γ evolution pattern in the two GRBs are different. The increasing-to-coasting evolution pattern of Γ in GRB 090618 likely indicates that the GRB fireball is still being accelerated in the prompt phase. The clear decrease evolution pattern of Γ in GRB 140508A suggests the deceleration of the fireball components. By deriving the Γ value through fitting their spectral energy distribution in different flares of 3C 454.3, a pattern of Γ-tracking-γ-ray flux is clearly found, likely indicating that the observed gamma-ray flares are being due to the Doppler boosting effect to the jet emission.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2017 

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