论文标题
在奇数无线电圈子上，作为超新星残余物
On Odd Radio Circles as Supernova Remnants
论文作者
论文摘要
在现代全天空无线电调查中发现的Arcmin大小的奇数无线电圆圈（ORC）的起源仍然不确定，在低密度环境培养基中，从Starburst/AGN驱动的冲击到超新星残余（SNR）的解释。使用精心校准的无线电曲线模型，我们评估了兽人是无线电SNR在低环境密度下进化的可能性。我们的模型表明，鉴于它们观察到的通量密度和角度尺寸，SNRS必须分别在200 kpc和100 kpc之内，因此SNR必须分别在200 kpc和100 kpc之内，这意味着ORCS 1-5和J0624-6948（在LMC附近），鉴于其观察到的通量密度和角度尺寸。要在银河系的圆形介质中发展，我们的模型要求ORCS 1-5在50 kpc之内以射流为主的SNR，以$（0.2-1.2）\ times 10^{ - 3} $ CM $ $ $ $ $^{ - 3} $的环境密度发展。但是，这在统计学上不可能，因为Orcs 1-5年龄<640美元的年龄，比其预期的$ \ gtrsim $ 10 $ 10 $^5 $ yrs小得多，并且因为Stellar Halo的低SN速率和陡峭的Halo概况意味着Orc likclige Orc likclige of Cyclige ofc lighclige ofc lighciellige ofc lignligiage of cp light snrs of cpc s snrs of cp lighligials of 50 kpc in 50 kpc。与兽人1-5相比，J0624-6948的海洋媒介中型SNR场景更有可能（尽管概率仍然很低），因为我们的型号允许J0624-6948允许$ \ Lessim $ \ Lessim $ 3000年。 On the other hand, the interpretation of J0624-6948 as a Sedov-Taylor SNR at 50 kpc (LMC) distance is possible for a wide range of ambient densities ($6 \times 10^{-4} - 0.5$ cm$^{-3}$) and ages $\sim$$(0.2-2.6) \times 10^4$ yr, while also being consistent with the local HI environment.
The origin of arcmin-sized Odd Radio Circles (ORCs) found in modern all-sky radio surveys remain uncertain, with explanations ranging from starburst/AGN-driven shocks to supernova remnants (SNRs) in the low-density ambient medium. Using well-calibrated radio light curve models, we assess the possibility that ORCs are radio SNRs evolving in low ambient densities. Our models imply that ORCs 1-5 and J0624-6948 (near the LMC) as SNRs must be within 200 kpc and 100 kpc from the Sun respectively, given their observed flux densities and angular sizes. To be evolving in the circumgalactic medium of the Milky Way, our models require ORCs 1-5 to be ejecta-dominated SNRs within 50 kpc, evolving in ambient densities of $(0.2-1.2) \times 10^{-3}$ cm$^{-3}$. However, this is statistically unlikely because ORCs 1-5 would have ages $<640$ yrs, much smaller than their expected lifetimes of $\gtrsim$10$^5$ yrs at these densities, and because the low SN rate and steep profile of the stellar halo imply a negligible number of ORC-like SNRs within 50 kpc. The circumgalactic medium SNR scenario for J0624-6948 is more likely (though still low probability) compared to ORCs 1-5, as our models allow J0624-6948 to be $\lesssim$3000 yrs. On the other hand, the interpretation of J0624-6948 as a Sedov-Taylor SNR at 50 kpc (LMC) distance is possible for a wide range of ambient densities ($6 \times 10^{-4} - 0.5$ cm$^{-3}$) and ages $\sim$$(0.2-2.6) \times 10^4$ yr, while also being consistent with the local HI environment.
