论文标题
G2.4 $+$ 1.4的集成无线电频谱
The integrated radio spectrum of G2.4$+$1.4
论文作者
论文摘要
银河源G2.4 $+$ 1.4是一个光学和无线电星云，其中包含极端的狼 - 射线星。一次，由于其明显的非热无线电频谱，该来源被视为超新星残留物，尽管这是基于有限的观察结果。随后的观察结果支持G2.4 $+$ 1.4的平坦，光学薄的热无线电光谱，并被确定为光电离的大量气泡，而不是超新星残留物。然而，最近，据称该来源具有非热的综合无线电频谱。 I discuss the integrated radio flux densities available for G2.4$+$1.4 from a variety of surveys, and show that it has a flat spectrum at gigahertz frequencies (with a spectral index $α$ of $0.02 \pm 0.08$, where flux density $S$ scales with frequency $ν$ as $S \propto ν^{-α}$).
The Galactic source G2.4$+$1.4 is an optical and radio nebula containing an extreme Wolf--Rayet star. At one time this source was regarded as a supernova remnant, because of its apparent non-thermal radio spectrum, although this was based on limited observations. Subsequent observations instead supported a flat, optically thin thermal radio spectrum for G2.4$+$1.4, and it was identified as a photoionized, mass-loss bubble, not a supernova remnant. Recently, however, it has been claimed that this source has a non-thermal integrated radio spectrum. I discuss the integrated radio flux densities available for G2.4$+$1.4 from a variety of surveys, and show that it has a flat spectrum at gigahertz frequencies (with a spectral index $α$ of $0.02 \pm 0.08$, where flux density $S$ scales with frequency $ν$ as $S \propto ν^{-α}$).
