标题： CHANG-ES XXXII：仅从射电数据中分离出空间分辨的热/非热成分——对NGC 3044和NGC 5775的新探查 显示英文标题

标题： CHANG-ES XXXII: Spatially Resolved Thermal/Nonthermal Separation from Radio Data Alone -- New Probes into NGC 3044 and NGC 5775

摘要： 我们仅使用射电数据对两个边缘朝向的星系NGC~3044和NGC~5775进行了空间分辨的热/非热分离。 在几乎连续的1.25至7.02 GHz频率带（L波段、S波段和C波段）内的窄带成像使我们能够拟合光谱并构建热、非热和非热光谱指数图。 此方法不需要任何辅助的H$\alpha$和红外数据，也不依赖于在边缘朝向星系中具有挑战性的尘埃校正。 对于NGC~3044，在15角秒的分辨率下，我们在4.13 GHz处发现热成分的中位数为$\sim\, 13$%，该成分的估计不确定性为$\sim\, 50$%。 这与H$\alpha$混合方法的结果相符。 我们发现了垂直外流特征的证据，其投影高度至少达到$z\,\sim\,3.5$kpc，类似于M82的星暴风。 对于更高恒星形成率的星系NGC~5775，在12角秒的分辨率下，我们在4.13 GHz处发现热成分的中位数为44%，该成分的估计误差为17%。 这两个星系在L波段均表现出斜率的变化（变平）。 这些结果表明，仅使用射电的方法来分离热辐射和非热辐射不仅是可行的，而且能够揭示可能在边缘朝向盘中被遮蔽的新特征。 显示英文摘要

摘要： We have carried out spatially resolved thermal/nonthermal separation on two edge-on galaxies, NGC~3044 and NGC~5775, using only radio data. Narrow-band imaging within a frequency band that is almost contiguous from 1.25 to 7.02 GHz (L-band, S-band and C-band) has allowed us to fit spectra and construct thermal, nonthermal, and nonthermal spectral index maps. This method does not require any ancillary H$\alpha$ and infrared data, or reliance on dust corrections that are challenging in edge-on galaxies. For NGC~3044, at 15 arcsec resolution, we find a median thermal fraction of $\sim\, 13$\% with an estimated uncertainty in this fraction of $\sim\, 50$\% at 4.13 GHz. This compares well with the H$\alpha$ mixture method results. We uncovered evidence for a vertical outflow feature reaching at least $z\,\sim\,3.5$ kpc in projection above the plane, reminiscent of M82's starburst wind. For the higher SFR galaxy, NGC~5775 at 12 arcsec resolution, we find a median thermal fraction of 44\% at 4.13 GHz with an estimated error on this fraction of 17\%. Both galaxies show a change of slope (flattening) in L-band. These results suggest that a radio-only method for separating thermal from nonthermal emission is not only feasible, but able to reveal new features that might otherwise be obscured in edge-on disks.