2025年6月1日
UGC 1810: Wildly Interacting Galaxy from Hubble
Image Credit: NASA, ESA, Hubble, HLA; Processing & Copyright: Domingo Pestana
Explanation: What’s happening to this spiral galaxy? Although details remain uncertain, it surely has to do with an ongoing battle with its smaller galactic neighbor. The featured galaxy is labelled UGC 1810 by itself, but together with its collisional partner is known as Arp 273. The overall shape of UGC 1810 — in particular its blue outer ring — is likely a result of wild and violent gravitational interactions. This ring’s blue color is caused by massive stars that are blue hot and have formed only in the past few million years. The inner galaxy appears older, redder, and threaded with cool filamentary dust. A few bright stars appear well in the foreground, unrelated to UGC 1810, while several galaxies are visible well in the background. Arp 273 lies about 300 million light years away toward the constellation of Andromeda. Quite likely, UGC 1810 will devour its galactic sidekick over the next billion years and settle into a classic spiral form.
Tomorrow’s picture: nebula veiled
哈勃影像: 受到强烈扰动的星系UGC 1810
影像提供: NASA, ESA, Hubble, HLA; 影像处理与版权: Domingo Pestana
说明: 这个螺旋星系怎么了？虽然细节仍难以确定，但肯定和它与较小的伴星系之间的战争有关。这幅影像所呈现的主题星系是UGC 1810，而它和互撞伙伴合称为Arp 273。UGC 1810的整体外观，尤其是它的蓝色外环，可能是猛烈的重力 交互作用的产物。这道环的泛蓝色泽，是由刚在过去数百万年内形成的炽热蓝色大质量恒星渲染出来的。星系的内围，看来较老较红而且交织着低温的尘埃丝。影像中的数颗明亮恒星，近在前景与UGC 1810并无关联，而背景中还可见到数个星系。Arp 273位于仙女座方向，离我们约有3亿光年远。UGC 1810很可能在接下来的数十亿年之中，会把它的伴星系 吞掉，回复经典的螺旋外观。
明日的图片: nebula veiled
