Imaging the Southern Sky in [SII]

AST 0205872 GaustadDR.斯沃斯莫尔学院的John Gaustad最近完成了一份南方H-Alpha天空调查地图集(SHASSA)。本图集中的图像分辨率为0.8角分，感光度为每像素2射线。Gaustad博士现在将使用相同的机器人摄像系统来获得电离硫发射线(SII)中更亮的H-Alpha区域的可比图像。SiI/H-Alpha比率是区分被嵌入恒星的紫外线加热的区域和由超新星残骸和恒星风产生的超音速冲击波加热的区域的有用判别器。这些测量将有助于理解银河系星际介质中电离区的天体物理性质。***

AST 0205872GaustadDr. John Gaustad, at Swarthmore College, recently completed a Southern H-Alpha Sky Survey Atlas (SHASSA). The images in this atlas have a resolution of 0.8 arcminutes and sensitivity of 2 rayleighs per pixel. Dr. Gaustad will now use the same robotic camera system to obtain comparable images of the brighter H-alpha regions in an emission line of ionized sulfur (SII). The SII/H-alpha ratio is a useful discriminator between regions that are heated by the ultraviolet light of embedded stars and regions that are heated by supersonic shock waves produced by supernova remnants and stellar winds. These measurements will contribute to understanding the astrophysical nature of ionized regions in the interstellar medium of the Galaxy. ***