Radio Continuum Study of the Large Magellanic Cloud Supernova Remnant Honeycomb Nebula
Serbian Astronomical Journal(2024)
摘要
We present the first and deepest Australia Telescope Compact Array radio
continuum images of the Honeycomb Nebula at 2000 and 5500 MHz solely from
archival data. The resolutions of these images are 3.6 x 2.8 arcsec2 and 1.3 x
1.2 arcsec2 at 2000 and 5500 MHz. We find an average radio spectral index for
the remnant of -0.76 +- 0.07. Polarisation maps at 5500 MHz reveal an average
fractional polarisation of 25 +- 5
estimate the equipartition field for Honeycomb Nebula of 48 +- 5 μG, with
an estimated minimum energy of Emin = 3 x 1049 erg. The estimated surface
brightness, Σ1 GHz , is 30 x 10-20 W m-2 Hz-1 sr-1; applying the
Σ-D relation suggests this supernova remnant is expanding into a
low-density environment. Finally, using Hi data, we can support the idea that
the Honeycomb Nebula exploded inside a low-density wind cavity. We suggest that
this remnant is likely to be between late free expansion stage and early Sedov
phase of evolution and expanding into a low-density medium.
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