圖片來源: Takami et al.
top: Distribution of molecular hydrogen emission in the L 1157 jet. Blue, green, and red colors show emissions at 3.6, 4.5, and 8.0μm observed with the Spitzer Space Telescope. The infrared emission originates from shock waves in the jet, the speed of which is ~10-30km s-1. Color variation in the figure results from different temperatures or densities of gas. Bottom: Our new analysis for identifying regions at high temperatures and densities (dark) and low temperatures or densities (bright). We speculate that the protostar may act as a "shot-gun", ejecting the gas bullets (dark spots in the figure) with the trajectory shown with arrows, and entraining the surrounding gas seen as bright
regions. The features with asterisks are due to stars (i.e., not gas in the jet).
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