螺旋星系M74：更清晰的视角
(原标题: Spiral Galaxy M74: A Sharper View)
2022-07-22
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美丽的螺旋星系梅西耶74（也被称为NGC 628）位于大约3200万光年外的双鱼座。M74是一个由大约1000亿颗恒星组成的岛屿宇宙，拥有两条突出的旋臂，长期以来一直被天文学家视为大设计螺旋星系的完美典范。这张最近处理过的图像使用的是詹姆斯韦伯太空望远镜的公开数据，M74的中心区域呈现出令人惊叹的清晰焦点。图像数据集的彩色组合来自韦伯的两个仪器NIRcam和MIRI，工作在近红外和中红外波长。它揭示了大设计螺旋星系中温度较低的恒星和尘埃结构，这在以前的太空观测中只是有所暗示。
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Beautiful spiral galaxy Messier 74 (also known as NGC 628) lies some 32 million light-years away toward the constellation Pisces. An island universe of about 100 billion stars with two prominent spiral arms, M74 has long been admired by astronomers as a perfect example of a grand-design spiral galaxy. M74's central region is brought into a stunning, sharp focus in this recently processed image using publicly available data from the James Webb Space Telescope. The colorized combination of image data sets is from two of Webb's instruments NIRcam and MIRI, operating at near- and mid-infrared wavelengths. It reveals cooler stars and dusty structures in the grand-design spiral galaxy only hinted at in previous space-based views.
© Robert Eder