NGC6908的奇特案例
The Curious Case of NGC6908
摘要：
NGC 6908曾经被认为是附近螺旋星系NGC 6907的东部螺旋臂中的表面亮度增强。基于近红外成像的检查，该物体实际上是一个透镜状S 0（6/7）星系，隐藏在较大星系的盘和螺旋结构的光学眩光中。NGC 6908的新径向速度（3，060 +/-16（排放）; 3，113 +/-73 km/s在智利Las Campanas的Baade 6.5米望远镜和杜邦2.5米望远镜上获得了NGC 6908（吸收）），将NGC 6908置于与NGC 6907相同的膨胀速度距离（3，190 +/-5 km/s），消除了纯粹偶然的视线重合的可能性。NGC 6907的圆盘和外部螺旋结构中曾经神秘的不对称性现在被解释为是由于高级合并事件。在这个星系的外围新发现的尾巴和碎片进一步支持了这个系统的合并场景。这对星系是100多年前发现的两个物体的一个相当引人注目的例子，直到在红外波长下工作的现代探测器为我们提供了新的（高对比度）外观之前，它们的真实性质一直消失。嵌入合并残余物的其他例子也可能在附近星系的近红外成像的越来越多的样本中揭示出来;一项试点研究确实揭示了其他几个有希望的后续观测候选者。
英文摘要：
The object NGC6908 was once thought to be simply a surface-brightness enhancement in the eastern spiral arm of the nearby spiral galaxy NGC6907. Based on an examination of near-infrared imaging, the object is shown in fact to be a lenticular S0(6/7) galaxy hidden in the optical glare of the disk and spiral structure of the larger galaxy. New radial velocities of NGC6908 (3,060+/-16 (emission); 3,113+/-73 km/s (absorption)) have been obtained at the Baade 6.5m and the duPont 2.5m telescopes at Las Campanas, Chile placing NGC6908 at the same expansion-velocity distance as NGC6907 (3,190+/-5 km/s), eliminating the possibility of a purely chance line-of-sight coincidence. The once-enigmatic asymmetries in the disk and outer spiral structure of NGC6907 are now explained as being due to an advanced merger event. Newly discovered tails and debris in the outer reaches of this galaxy further support the merger scenario for this system. This pair of galaxies is a rather striking example of two objects discovered over 100 years ago, whose true nature was lost until modern detectors operating at infrared wavelengths gave us a new (high-contrast) look. Other examples of embedded merger remnants may also reveal themselves in the growing samples of near-infrared imaging of nearby galaxies; and a pilot study does reveal several other promising candidates for follow-up observations.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
