星际天气风向标：M17和RCW49中的GLIMPSE中红外恒星风弓形激波
Interstellar Weather Vanes: GLIMPSE Mid-Infrared Stellar-Wind Bowshocks in M17 and RCW49
摘要：
我们报告发现六个红外星风弓形激波在银河系大质量恒星形成区M17和RCW 49从斯皮策GLIMPSE（银河遗产红外中面巡天非凡）图像。斯皮策太空望远镜上的红光阵列照相机（IRAC）清楚地分辨出弓形激波产生的弧形辐射。我们结合了两微米全天巡天（2MASS），斯皮策，MSX和IRAS观测，以获得弓形激波及其单个驱动星的光谱能量分布（SED）。我们使用恒星的SED估计的光谱类型的三个新确定的O型星在RCW49和一个以前未发现的O型星在M17。RCW 49中的一个弓形激波揭示了存在一个以每秒10^2公里的速度从H II区逃逸的大规模气体流。辐射传输模型的陡峭上升，在SED的这个弓形激波向较长的中红外波长表明，发射主要来自尘埃加热的恒星驱动的冲击。其他5个弓形激波发生在O型星的恒星风卷起正在扩张的H II区域的尘埃的地方。
英文摘要：
We report the discovery of six infrared stellar-wind bowshocks in the Galactic massive star formation regions M17 and RCW49 from Spitzer GLIMPSE (Galactic Legacy Infrared Mid-Plane Survey Extraordinaire) images. The InfraRed Array Camera (IRAC) on the Spitzer Space Telescope clearly resolves the arc-shaped emission produced by the bowshocks. We combine Two Micron All-Sky Survey (2MASS), Spitzer, MSX, and IRAS observations to obtain the spectral energy distributions (SEDs) of the bowshocks and their individual driving stars. We use the stellar SEDs to estimate the spectral types of the three newly-identified O stars in RCW49 and one previously undiscovered O star in M17. One of the bowshocks in RCW49 reveals the presence of a large-scale flow of gas escaping the H II region at a few 10^2 km/s. Radiation-transfer modeling of the steep rise in the SED of this bowshock toward longer mid-infrared wavelengths indicates that the emission is coming principally from dust heated by the star driving the shock. The other 5 bowshocks occur where the stellar winds of O stars sweep up dust in the expanding H II regions.
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