Likely the first reported protoplanetary nebula IRAS 18443-0231 related to very high energy emission.
Proto-Planetary Nebula: IRAS 18443-0231
It is considered as a proto-planetary nebula, which is a transitional phase between the late stages of a star’s life and the formation of a planetary nebula.
https://twitter.com/AstroArxiv/status/1810886477481705855
Location
IRAS 18443-0231 is located almost at the center of the Fermi confidence ellipse and is related to the hard X-ray source 4XMM J184700.4-022752.
Gamma-Ray Emission
Recent studies suggest that IRAS 18443-0231 might be associated with gamma-ray emissions. This is significant because it could be the first known association between a proto-planetary nebula and gamma-ray emission.
https://twitter.com/AstroArxiv/status/1798580836264268262
Jets and Outflows
Observations have identified a compact source with jet-like morphology and an associated red-shifted CO molecular outflow. These jets are believed to be responsible for the gamma-ray emissions through mechanisms like proton-proton collisions and relativistic Bremsstrahlung.
Radio Continuum Emission
The radio continuum emission at 3 GHz shows a compact source related to faint emission with jet-like morphology. The radio spectral index values range from -0.57 to -0.39, indicating synchrotron emission due to particles accelerated by the jets.
https://twitter.com/AstroArxiv/status/1806178970884592059
This object is a subject of ongoing research, and its unique characteristics make it an intriguing target for further study in the field of astrophysics.
References:
A comprehensive analysis towards the Fermi-LAT source 4FGL J1846.9–0227: jets of a protoplanetary nebula producing γ-rays?
M E Ortega, A Petriella, S Paron
https://academic.oup.com/mnras/article/532/4/4446/7710749?login=false
Circular Astronomy 