对费米大视场望远镜源4FGL J1846.9-0227的综合分析：原行星盘的喷流产生γ射线？
A comprehensive analysis toward the Fermi-LAT source 4FGL J1846.9-0227: Jets of a proto-planetary nebula producing gamma-rays?
AI总结：
本研究对未证认的费米γ射线源4FGL J1846.9-0227开展多波段综合分析，提出其最可能的对应体是原行星盘IRAS 18443−0231，其喷流可通过多种机制产生γ射线，这将是首个原行星盘与γ射线辐射关联的案例。
摘要：
费米大视场望远镜（Fermi-LAT）14年源表中的大多数γ射线源都与脉冲星和耀变体相关联。然而，揭示那些仍未被证认的γ射线源的本质，对于理解天体物理对象中的高能辐射机制具有重要意义。\n本研究对费米源4FGL J1846.9−0227覆盖的天区开展了综合研究，该源此前曾被认为是耀变体和大质量原恒星。我们利用多波段观测，分析了该天区内的多个天体作为Fermi-LAT源对应体的可能性。\n在经过详细全面的分析排除了其中大多数候选体后，我们认为最可能的对应体候选者是IRAS 18443−0231——一个可能的原行星盘。我们发现，IRAS 18443−0231在3 GHz的射电连续谱辐射呈现出一个致密源，其与具有喷流形态的暗弱辐射相关。此外，我们还识别出一个与之相关的红移CO分子外向流。\n利用多个星表的数据，我们得到IRAS 18443−0231的射电谱指数在−0.57到−0.39之间，表明其辐射是由喷流加速的粒子产生的同步辐射。我们指出，这些喷流可以通过质子-质子碰撞和相对论性轫致辐射等机制解释γ射线辐射。\nIRAS 18443−0231几乎位于费米置信椭圆的中心，且与硬X射线源4XMM J184700.4−022752相关，它将成为首个被发现与γ射线辐射相关联的原行星盘。
英文摘要：
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.
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