Includes Reference

Supernova remnant SN386(G7.7-3.7) presented captivating attention for multi-wavelength
observation. In this study, we investigated the structural characteristics of G7.7-3.7 with
higher resolution MeerKAT observation at 1284 MHz, revealing intricate details of its
morphology and emission mechanisms. MeerKAT observations revealed G7.7-3.7 as an
almost circular structure with filamentary features, manifesting in various blowouts. The
western boundary exhibited a strong bright blowout, while the southern perimeter show
cased extended bright filaments with feather-like structures, seemingly disconnected from
the western blowout. Moreover, the eastern region presented a faint blowout with a cen
tralized bright point source, while faint elongated filaments traversed the northwest, linked
the eastern point source and western blowout and progressed outward uniformly. Spectral
index analysis indicated a steep spectrum (𝛼 ranged ∼ 0 to ∼-3), suggesting a combination
of synchrotron and few traces of thermal emissions at the edges of bright blowouts. Bright
blowouts with a less steep spectrum ranging from ∼-0.5 to ∼-1.5 were dominated by
shock-accelerated particles encountering irregularities and weakening in magnetic fields.
Spectral index values close to 𝛼 = 0, showed the presence of traces of thermal emissions
from shock-heated gases, especially at the edge of the bright blowout. However, the faint
emissions along the filaments connecting the eastern and western blowouts with a very
steep spectral index of ∼-3 comprised synchrotron emissions from aged particles that had
dissipated energy due to turbulent re-acceleration. Analysis of MeerKAT and VLA data
gave an expansion of Δ𝜃 = 9 ± 0.45 arcsec over a period of Δt = 31.907 yr corresponding
to an expansion rate 𝜃 = 0.282 ± 0.014 arcsec yr−1 . The data recorded a shock speed of
5883 ± 294 km s−1 and an age of 1636 ± 115 years. The revised age fitted with the explo
sion event of 386 CE and the observed data in 2023. Furthermore, our multi-wavelength
investigation unveiled an intriguing structure within the southern radio blowout exhibiting
a convergence of features such as the bright radio blowout, a prominent X-ray arc and two
faint optical filaments aligned with the X-ray bright arc. We attributed the bright radio
blowouts to the non-uniform mass outflow from the localized high-density population of
the shock-accelerated particles and the weakening of magnetic fields along its perimeter.
Thermal emissions traces along the edges of blowouts resulted from shock-heated gases
intensifying in the south due to the presence of high-density ISM. Thus, we proposed that
the supernova of G7.7-3.7 occurred in an environment of varying densities of interstellar
medium (ISM). Consequently, this environment facilitated X-ray emissions and the forma
tion of faint optical filaments due to collisions with the ISM and the circumstellar materials
from the progenitor star respectively. Our findings shed light on the complex interplay of
physical processes within G7.7-3.7, offering valuable insights into the dynamics and evo
lution of supernova remnants.