比较c2d遗留云中大尺度的恒星形成：对巨蛇座、英仙座和蛇夫座的Bolocam 1.1毫米尘埃连续巡天
Comparing Star Formation on Large Scales in the c2d Legacy Clouds: Bolocam 1.1 mm Dust Continuum Surveys of Serpens, Perseus, and Ophiuchus
摘要：
我们在加州理工学院亚毫米天文台使用Bolocam对附近的三个恒星形成云进行了前所未有的1.1毫米连续测量。到目前为止，我们在毫米或亚毫米波长下绘制了每个云层中最大的区域：7.5平方英尺。在英仙座（纸一），10.8平方米。度在蛇夫座（纸二），和1.5平方米。Serpens的分辨率为31”，分别检测122、44和35个岩心。在这里，我们报告了巨蛇座调查的结果，并比较了三种云。平均测得的角核心的大小和分辨率的依赖关系表明，许多观察到的源是一致的幂律密度分布。云的距离的影响的测试表明，线性分辨率强烈影响测量源的大小和密度，但不影响质量分布的形状。英仙座和蛇夫座的核心质量分布斜率（α =2.1+/-0.1和α =2.1+/-0.3）与最近对恒星IMF的测量一致，而巨蛇座的分布更平坦（α =1.6+/-0.2）。我们还比较了相对质量分布形状的预测从湍流破碎模拟。在这三个星云中，致密的核心占总星云质量的比例不到10%，这与其他低恒星形成效率的测量结果一致。此外，大多数岩芯都是在高柱密度下发现的;超过75%的1.1毫米岩芯与英仙座的Av>8等，巨蛇座的Av> 15等，蛇夫座的Av> 20-23等有关。
英文摘要：
We have undertaken an unprecedentedly large 1.1 millimeter continuum survey of three nearby star forming clouds using Bolocam at the Caltech Submillimeter Observatory. We mapped the largest areas in each cloud at millimeter or submillimeter wavelengths to date: 7.5 sq. deg in Perseus (Paper I), 10.8 sq. deg in Ophiuchus (Paper II), and 1.5 sq. deg in Serpens with a resolution of 31", detecting 122, 44, and 35 cores, respectively. Here we report on results of the Serpens survey and compare the three clouds. Average measured angular core sizes and their dependence on resolution suggest that many of the observed sources are consistent with power-law density profiles. Tests of the effects of cloud distance reveal that linear resolution strongly affects measured source sizes and densities, but not the shape of the mass distribution. Core mass distribution slopes in Perseus and Ophiuchus (alpha=2.1+/-0.1 and alpha=2.1+/-0.3) are consistent with recent measurements of the stellar IMF, whereas the Serpens distribution is flatter (alpha=1.6+/-0.2). We also compare the relative mass distribution shapes to predictions from turbulent fragmentation simulations. Dense cores constitute less than 10% of the total cloud mass in all three clouds, consistent with other measurements of low star-formation efficiencies. Furthermore, most cores are found at high column densities; more than 75% of 1.1 mm cores are associated with Av>8 mag in Perseus, 15 mag in Serpens, and 20-23 mag in Ophiuchus.
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