论文标题
Galaxy“缺失暗物质” NGC1052-DF4正在遭受潮汐破坏
The galaxy "missing dark matter" NGC1052-DF4 is undergoing tidal disruption
论文作者
论文摘要
缺乏暗物质的长寿命星系的存在是我们对星系形成方式的理解的挑战。在这里，我们提供的证据说明了其中一个星系中缺乏暗物质的证据：NGC1052-DF4。该系统的深层光学成像检测到该物体与相邻Galaxy NGC1035相互作用引起的潮汐尾巴。由于恒星比暗物质更集中，因此在影响银河系的恒星之前，潮汐剥离将去除很大一部分的暗物质。星系的恒星质量中只有约7％是在潮汐尾部，这表明NGC1052-DF4的恒星仅在现在才受到相互作用的影响，而剩余的暗物质的百分比<1％。这自然解释了该星系中推断出的暗物质的低含量，并将这些类型的星系与我们当前的星系形成模型进行了调解。
The existence of long-lived galaxies lacking dark matter represents a challenge to our understanding of how galaxies form. Here, we present evidence that explains the lack of dark matter in one of such galaxies: NGC1052-DF4. Deep optical imaging of the system has detected tidal tails in this object caused by its interaction with its neighbouring galaxy NGC1035. As stars are more centrally concentrated than the dark matter, the tidal stripping will remove a significant percentage of the dark matter before affecting the stars of the galaxy. Only ~7% of the stellar mass of the galaxy is in the tidal tails, suggesting that the stars of NGC1052-DF4 are starting only now to be affected by the interaction, while the percentage of remaining dark matter is <1%. This naturally explains the low content of dark matter inferred for this galaxy and reconciles these type of galaxies with our current models of galaxy formation.
