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NASA Technical Reports Server (NTRS) 20230001178: Significant and V...
by NASA Technical Reports Server (NTRS)
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Measurement of polarized light provides a direct probe of
magnetic fields in collimated outflows (jets) of
relativistic plasma from accreting stellar-mass black
holes at cosmological distances. These outflows power
brief and intense flashes of prompt gamma-rays known as
Gamma Ray Bursts (GRBs), followed by longer-lived
afterglow radiation detected across the electromagnetic
spectrum. Rapid-response polarimetric observations of
newly discovered GRBs have probed the initial afterglow
phase. Linear polarization degrees as high as 30% are
detected minutes after the end of the prompt GRB
emission, consistent with a stable, globally ordered
magnetic field permeating the jet at large distances from
the central source. In contrast, optical and gamma-ray
observations during the prompt phase led to discordant
and often controversial results, and no definitive
conclusions on the origin of the prompt radiation or the
configuration of the magnetic field could be derived.
Here we report the detection of linear polarization of a
prompt optical flash that accompanied the extremely
energetic and long-lived prompt gamma-ray emission from
GRB 160625B. Our measurements probe the structure of the
magnetic field at an early stage of the GRB jet, closer
to the central source, and show that the prompt GRB phase
is produced via fast cooling synchrotron radiation in a
large-scale magnetic field advected from the central
black hole and distorted from dissipation processes
within the jet.
Date Published: 2023-05-27 15:48:07
Identifier: NASA_NTRS_Archive_20230001178
Item Size: 597621
Language: english
Media Type: texts
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