A comprehensive analysis toward the Fermi-LAT source 4FGL J1846.9-0227: Jets of a proto-planetary nebula producing gamma-rays?
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| Format: | Preprint |
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2024
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| _version_ | 1866916317088448512 |
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| author | Ortega, M. E. Petriella, A. Paron, S. |
| author_facet | Ortega, M. E. Petriella, A. Paron, S. |
| contents | Most of the $γ$-ray sources in the Fermi-LAT 14-year Source Catalogue are associated with pulsars and blazars. However, unveiling the nature of the still unassociated $γ$-ray sources is important for the understanding of high energy emission mechanisms in astrophysical objects. This work presents a comprehensive study towards the region covered by the Fermi source 4FGL J1846.9$-$0227, previously suggested to be a blazar and a massive protostar. Using multiwavelength observations, we analysed several astrophysical objects in the region as possible counterparts of the Fermi-LAT source. Having discarded most of them after a detailed and comprehensive analysis, we suggest that the most likely candidate to be such a counterpart is IRAS 18443$-$0231, a likely proto-planetary nebula. We found that the radio continuum emission at 3 GHz of IRAS 18443$-$0231 shows a compact source related to faint emission with jet-like morphology. Additionally, we identified an associated red-shifted CO molecular outflow. Using data from several catalogues, we obtained radio spectral index values ranging from $-$0.57 to $-$0.39 for IRAS 18443$-$0231, indicating syncrothron emission due to particles accelerated by the jets. We point out that these jets could explain the $γ$-ray emission through mechanisms such as proton-proton collisions and relativistic Bremsstrahlung. IRAS 18443$-$0231, lying almost at the centre of the Fermi confidence ellipse and related to the hard X-ray source 4XMM J184700.4$-$022752, would be the first association between a proto-planetary nebula and $γ$-ray emission. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_03219 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A comprehensive analysis toward the Fermi-LAT source 4FGL J1846.9-0227: Jets of a proto-planetary nebula producing gamma-rays? Ortega, M. E. Petriella, A. Paron, S. High Energy Astrophysical Phenomena Most of the $γ$-ray sources in the Fermi-LAT 14-year Source Catalogue are associated with pulsars and blazars. However, unveiling the nature of the still unassociated $γ$-ray sources is important for the understanding of high energy emission mechanisms in astrophysical objects. This work presents a comprehensive study towards the region covered by the Fermi source 4FGL J1846.9$-$0227, previously suggested to be a blazar and a massive protostar. Using multiwavelength observations, we analysed several astrophysical objects in the region as possible counterparts of the Fermi-LAT source. Having discarded most of them after a detailed and comprehensive analysis, we suggest that the most likely candidate to be such a counterpart is IRAS 18443$-$0231, a likely proto-planetary nebula. We found that the radio continuum emission at 3 GHz of IRAS 18443$-$0231 shows a compact source related to faint emission with jet-like morphology. Additionally, we identified an associated red-shifted CO molecular outflow. Using data from several catalogues, we obtained radio spectral index values ranging from $-$0.57 to $-$0.39 for IRAS 18443$-$0231, indicating syncrothron emission due to particles accelerated by the jets. We point out that these jets could explain the $γ$-ray emission through mechanisms such as proton-proton collisions and relativistic Bremsstrahlung. IRAS 18443$-$0231, lying almost at the centre of the Fermi confidence ellipse and related to the hard X-ray source 4XMM J184700.4$-$022752, would be the first association between a proto-planetary nebula and $γ$-ray emission. |
| title | A comprehensive analysis toward the Fermi-LAT source 4FGL J1846.9-0227: Jets of a proto-planetary nebula producing gamma-rays? |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2406.03219 |