标题： 大质量吸积盘 显示英文标题

标题： Massive Accretion Disks

摘要： 最近的高分辨率近红外（HST-NICMOS）和毫米波干涉成像揭示了附近超亮星系核中的致密气体和尘埃吸积盘。 在研究最深入的超亮红外星系中，阿普220，2微米成像显示合并星系核中都有尘埃盘，而毫米波CO线成像表明每个盘中的分子气体质量约为10^9太阳质量。 阿普220中的两个气体盘是反向旋转的，它们的动力学质量约为2x10^9太阳质量，即仅比气体质量稍大一些。 这些盘的半径约为100秒差距，厚度为10-50秒差距。 CO线的高亮度温度表明，盘中的气体具有约25-50%的面积填充因子和平均密度大于~10^4厘米^(-3)。 在这些核盘内部，大质量恒星形成率无疑是惊人的，并且考虑到气体的高粘度，也会有高的径向吸积率，可能大于~10太阳质量/年。 如果这种流入持续到非常小的半径，它足以供给甚至最高亮度的活动星系核。 显示英文摘要

摘要： Recent high resolution near infrared (HST-NICMOS) and mm-interferometric imaging have revealed dense gas and dust accretion disks in nearby ultra-luminous galactic nuclei. In the best studied ultraluminous IR galaxy, Arp 220, the 2 micron imaging shows dust disks in both of the merging galactic nuclei and mm-CO line imaging indicates molecular gas masses approx. 10^9 M_sun for each disk. The two gas disks in Arp 220 are counterrotating and their dynamical masses are approx. 2x10^9 M_sun, that is, only slightly larger than the gas masses. These disks have radii approx 100 pc and thickness 10-50 pc. The high brightness temperatures of the CO lines indicate that the gas in the disks has area filling factors of approx. 25-50% and mean densities of >~ 10^4 cm^(-3). Within these nuclear disks, the rate of massive star formation is undoubtedly prodigious and, given the high viscosity of the gas, there will also be high radial accretion rates, perhaps >~ 10 M_sun/yr. If this inflow persists to very small radii, it is enough to feed even the highest luminosity AGNs.