恒星形成的初始条件VIII：蛇夫座星云L1688的观测研究和星前核质量函数的意义
The initial conditions of star formation VIII: an observational study of the Ophiuchus cloud L1688 and implications for the prestellar core mass function
摘要：
我们重新分析了在詹姆斯·克拉克·麦克斯韦望远镜（JCMT）上使用亚毫米级普通用户测辐射热计阵列（SCUBA）进行的蛇夫座暗云L1688的所有存档观测。这是我们第一次把不同时间从这片云上采集的所有数据放在一起，制作了一张比以前出版的更深的850微米的地图。使用这个新的，更深的地图，我们从数据中提取出前恒星的核心。我们使用更新的值的距离云复杂的，也为内部温度的恒星前的核心，以产生一个更新的核心质量函数（CMF）。这个更新的CMF与以前的结果是一致的，因为他们去了，但我们更深的地图给出了一个改进的完整性限制为0.1 Mo（0.16 Jy），这使我们能够表明，营业额存在于低质量的CMF制度。L1688 CMF与恒星IMF的形式相同，并且可以映射到恒星IMF上，这表明IMF是在星前核心阶段确定的。我们比较了L1688与猎户座恒星形成区，发现L1688 CMF的周转量大约是猎户座CMF周转量的两倍。这表明CMF周转的位置可能是环境的函数。
英文摘要：
We re-analyse all of the archive observations of the Ophiuchus dark cloud L1688 that were carried out with the submillimetre common-user bolometer array (SCUBA) at the James Clerk Maxwell Telescope (JCMT). For the first time we put together all of the data that were taken of this cloud at different times to make a deeper map at 850 microns than has ever previously been published. Using this new, deeper map we extract the pre-stellar cores from the data. We use updated values for the distance to the cloud complex, and also for the internal temperatures of the pre-stellar cores to generate an updated core mass function (CMF). This updated CMF is consistent with previous results in so far as they went, but our deeper map gives an improved completeness limit of 0.1 Mo (0.16 Jy), which enables us to show that a turnover exists in the low-mass regime of the CMF. The L1688 CMF shows the same form as the stellar IMF and can be mapped onto the stellar IMF, showing that the IMF is determined at the prestellar core stage. We compare L1688 with the Orion star-forming region and find that the turnover in the L1688 CMF occurs at a mass roughly a factor of two lower than the CMF turnover in Orion. This suggests that the position of the CMF turnover may be a function of environment.
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