NASA 美国宇航局的每日一图 3月份
发布: 2009-1-14 17:53 | 作者: webmaster | 来源: 本站原创 | 查看: 179次
2008 March 29 
影像版权与提供: Johannes Schedler (Panther Observatory) 说明: 位在北天大熊座里的螺旋星系NGC 2841，离我们大约有五千万光年。这张这个壮丽宇宙岛的清晰影像，突显了黄色的星系核心和紧缠的漩涡臂。NGC 2841的直径超过十五万光年，比我们的银河系还要来得大。在可见光影像里，这个星系的尘埃带和纷扰的恒星形成区都分布在漩涡臂上，但X射线波段影像却指出，恒星风和恒风爆炸产生了大量扩张进入四周晕圈的炽热气体。很明显的，影像里这些带着星芒的明亮恒星，是位在银河系的前景恒星，并不是NGC 2841的成员。
Explanation: Some 50 million light-years distant, spiral galaxy NGC 2841 can be found in the northern constellation of Ursa Major. This sharp view of the gorgeous island universe shows off a striking yellow nucleus and galactic disk with tightly wound spiral arms. NGC 2841 has a diameter of over 150,000 light-years, even larger than our own Milky Way Galaxy. The galaxy's dust lanes and turbulent star-forming regions are found along the spiral arms, but X-ray images suggest that resulting winds and stellar explosions create plumes of hot gas extending into a halo around NGC 2841. Of course, the prominent stars with a spiky appearance in the picture are close foreground objects within the Milky Way and not associated with NGC 2841.
