哈勃超深场星系旋臂间的颜色跃变
Colour jumps across the spiral arms of Hubble Ultra Deep Field galaxies
AI总结：
本文利用哈勃望远镜极深场数据测量了遥远旋涡星系的旋臂倾角，证实密度波理论预测的颜色跃变与梯度在遥远星系中已持续至少8 Gyr。
摘要：
我们在多个波长下，测量了来自哈勃空间望远镜极深场（XDF）的一批遥远旋涡星系样本的旋臂倾角。根据密度波理论，我们应能探测到旋臂间从红到蓝的颜色跃变。颜色跃变是大尺度激波的后果，这也产生了经典的从蓝到红的年龄/颜色梯度，且至今仅在邻近旋涡星系中被探测到。我们的结果表明，颜色跃变与梯度在过去至少8 Gyr内一直在遥远星系中发生，与密度波理论相符。
英文摘要：
We have measured, at various wavelengths, the spiral arm pitch angles of a sample of distant spiral galaxies from the Hubble Space Telescope eXtreme Deep Field (XDF). According to density wave theory, we should detect colour jumps from red-to-blue across the spiral arms. Colour jumps are a consequence of large-scale shocks, which also generate the classic blue-to-red age/colour gradients, and have only been detected until now in nearby spiral galaxies. Our results indicate that colour jumps and gradients have been occurring in distant galaxies for at least the last 8 Gyr, in agreement with density wave theory.
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。
