A Narrow Uniform Core with a Wide Structured Wing: Modeling the TeV and Multi-wavelength Afterglows of GRB 221009A
arxiv(2023)
摘要
The TeV afterglow of the BOAT GRB 221009A was interpreted as arising from a
narrow jet while the radio to X-ray afterglows were interpreted as arising from
a wide structured jet. However, there is no model explaining the TeV and
lower-energy multi-wavelength afterglows simultaneously. We here investigate a
two-component jet model, including a narrow uniform core with a wide structured
wing, to explain both the multi-wavelength afterglows that last up to 100 days.
We find that to explain the early TeV afterglow with the inverse-Compton
process, we need a circum-burst density higher than ≳ 0.1 cm^-3,
while the radio afterglow and the H.E.S.S. upper limit combine to constrain the
density to be lower at larger radii. Thus, a decreasing density profile with
radius is favored. Considering that the rising TeV light curve during the
afterglow onset favors a constant-density medium, we invoke a stratified
density profile, including a constant-density profile at small radii and a wind
density profile at large radii. We find that the two-component jet model with
such a stratified density profile can explain the TeV, X-ray and optical
afterglows of GRB 221009A, although the radio fluxes exceed the observed ones
by a factor of two at later epochs. The discrepancy in the radio afterglow
could be resolved by invoking some non-standard assumption about the
microphysics of afterglow shocks. The total kinetic energy of the two
components in our model is ≲ 10^52 erg, significantly smaller
than that in the single structured jet models.
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