The traveling-PWN modeling attempt on the mysterious LHAASO dumbbell-like structure
| Autor: | Xie, Caijin, Liu, Yihan, Shao, Chengyu, Cui, Yudong, Yang, Lili |
|---|---|
| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The first LHAASO catalog presents six mysterious Ultra-High-Energy (UHE) $\gamma$-ray sources -- 1LHAASO J0007$+$5659u, 1LHAASO J0206$+$4302u, 1LHAASO J0212$+$4254u, 1LHAASO J0216$+$4237u, 1LHAASO J1740$+$0948u and 1LHAASO J1959$+$1129u, which only have $>$ 25 TeV emission detected. No counterparts of the six sources have been observed, except two pulsars PSR J0218$+$4232 and PSR J1740$+$1000. Three of them -- 1LHAASO J0206$+$4302u, 1LHAASO J0212$+$4254u and 1LHAASO J0216$+$4237u are connected on the significance map and constituted a dumbbell-like structure. They are close in position and show a similar spectral shape, suggesting a physical association among them. To explain the origin of the six LHAASO sources, especially the interesting dumbbell-like structure, we conducted the leptonic and hadronic modeling research on them according to our multi-wavelength and multi-messenger study. For the dumbbell-like structure, a traveling Pulsar Wind Nebula (PWN) model under the isotropic and homogeneous diffusion condition is considered. No counterparts are discovered in our multi-wavelength and multi-messenger study, except the two known pulsars. The traveling-PWN modeling attempt with a single traveling-PWN seems to be difficult to explain the dumbbell-like structure, unless the diffusion coefficient is extremely low and the pulsar has a proper-motion velocity over 1200 km s$^{-1}$. We also explore the double traveling-PWNe explanation and find the occurring possibilities of these two explanations are much lower than that of an ordinary triple PWNe explanation. Moreover, according to our model, the only know pulsar nearby -- PSR J0218$+$4232 is unlikely to be associated with the dumbbell-like structure in an isotropic and homogeneous diffusion environment. The TeV emission of this pulsar is far from explaining even the eastern part of the structure. Comment: 19 pages, 12 Figures |
| Databáze: | arXiv |
| Externí odkaz: |
|