| 5th of September 2023 |
|---|
 |
| EMU discovery of a large supernova remnant |
| by Filipović et al. |
|
Filipović et al. present the serendipitous detection of a new
Galactic Supernova Remnant (SNR), G288.8-6.3, using data from the
ASKAP-EMU survey. A multi-frequency analysis confirms this object as
an evolved Galactic SNR at high Galactic latitude with low radio
surface brightness and typical SNR spectral index of -0.4. The angular
size is 1.8 x 1.6 square degrees, with an estimated intrinsic size of
~40 pc, which implies a distance of ~1.3 kpc and a position of ~140 pc
above the Galactic plane. This is one of the largest angular size and
closest Galactic SNRs. Given its low radio surface brightness, the team
suggest that it is about 13000 years old.
The ASKAP image of the Galactic SNR G288.8–6.3 at 943 MHz is shown above, convolved to a resolution of 30 arcseconds × 30 arcseconds. The magenta ellipse marks the position of the gamma-ray source 4FGL J1028.7–6431c (68% containment), while the cyan cross marks the position of the nearby radio pulsar J1036–6559. The yellow rectangular box marks an area considered in more detail in the paper. The grey scale (in Jy/beam) is displayed on the right side, using a logarithmic scale.
|