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Article overview
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Time-averaging Polarimetric and Spectral Properties of GRBs | | Liang Li
; Soroush Shakeri
; | | Date: |
2 Jan 2023 | | Abstract: | One of the most fundamental and yet open issues in gamma-ray burst (GRB)
physics, is the comprehension of the nature of their jet composition. The
investigation of joint polarimetric and spectral properties is essential to
probe the jet composition and radiation mechanism of GRBs. Several distinct
categories of jet properties -- the ’’Kinetic-energy-dominated" (KED),
’’Poynting-flux-dominated" (PFD), and ’’Hybrid-dominated" (HD) jets -- have
been observed in the observed GRB spectra, and the emission dominated by
different jet properties is expected to have a different level of polarization
($pi_{
m KED}lesssimpi_{
m HD}lesssimpi_{
m PED}$). In the present
paper, we collected a GRB sample in which all the bursts detected by the
Gamma-ray Burst Monitor (GBM) on board the NASA {it Fermi} Gamma-ray Space
Telescope whose polarization measurements are also reported in the literature
and the epochs of prompt emission are heavily overlapped with their
polarization observations, aiming to establish a connection between the
polarization and jet properties of GRBs, and to confirm the validity of this
correlation ($pi_{
m KED}lesssimpi_{
m HD}lesssimpi_{
m PED}$) from
observations. With a detailed spectral analysis, we found that all the bursts
are classified as the ’’Hybrid" jet type, implying that one cannot rule out
that the photosphere emission may also be the possible mechanism powering the
high levels of polarization. Finally, we present different polarization models
in the presence of ordered and random magnetic field configurations with the
properties of corresponding hybrid jets in order to interpret polarization
measurements of the prompt emission in our sample. | | Source: | arXiv, 2301.00576 | | Services: | Forum | Review | PDF | Favorites | |
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