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首页> 外文期刊>The Astrophysical journal >BOLOCAM SURVEY FOR 1.1 mm DUST CONTINUUM EMISSION IN THE c2d LEGACY CLOUDS. Ⅱ. OPHIUCHUS
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BOLOCAM SURVEY FOR 1.1 mm DUST CONTINUUM EMISSION IN THE c2d LEGACY CLOUDS. Ⅱ. OPHIUCHUS

机译：BOLOCAM调查在c2d旧式云中是否连续排放1.1毫米灰尘。 Ⅱ。奥菲丘斯

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摘要

We present a large-scale millimeter continuum map of the Ophiuchus molecular cloud. Nearly 11 deg~2, including all of the area in the cloud with A_V ≥ 3 mag, was mapped at 1.1 mm with Bolocam on the Caltech Submillimeter Observatory (CSO). By design, the map also covers the region mapped in the infrared with the Spitzer Space Telescope. We detect 44 definite sources, and a few likely sources are also seen along a filament in the eastern streamer. The map indicates that dense cores in Ophiuchus are very clustered and often found in filaments within the cloud. Most sources are round, as measured at the half-power point, but elongated when measured at lower contour levels, suggesting spherical sources lying within filaments. The masses, for an assumed dust temperature of 10 K, range from 0.24 to 3.9 solar mass, with a mean value of 0.96 solar mass. The total mass in distinct cores is 42 solar mass, 0.5%-2% of the total cloud mass, and the total mass above 4 σ is about 80 solar mass. The mean densities in the cores are quite high, with an average of 1.6 x 10~6 cm~(-3), suggesting short free-fall times. The core mass distribution can be fitted with a power law with slope α =2.1 ± 0.3 for M > 0.5 solar mass, similar to that found in other regions, but slightly shallower than that of some determinations of the local IMF. In agreement with previous studies, our survey shows that dense cores account for a very small fraction of the cloud volume and total mass. They are nearly all confined to regions with A_V ≥ 9 mag, a lower threshold than found previously.
机译：我们提出了蛇夫子分子云的大规模毫米连续谱图。在Caltech亚毫米天文台（CSO）上，用Bolocam将近11度2包括云中A_V≥3 mag的所有区域测绘为1.1 mm。通过设计，该地图还可以覆盖Spitzer空间望远镜在红外线中绘制的区域。我们检测到44个确定的源，并且在东部拖缆的一条细线上也看到了一些可能的源。该图表明，蛇夫座中的密实核心非常聚集，并且经常在云内的细丝中发现。从半功率点测量，大多数光源是圆形的，但在较低轮廓水平下测量时，光源是细长的，表明球形光源位于灯丝内。对于假定的粉尘温度为10 K，质量范围为0.24到3.9太阳质量，平均值为0.96太阳质量。不同核心的总质量为42太阳质量，占总云质量的0.5％-2％，大于4σ的总质量约为80太阳质量。岩心的平均密度非常高，平均为1.6 x 10〜6 cm〜（-3），表明自由落体时间短。对于M> 0.5太阳质量，核心质量分布可以拟合为斜率α= 2.1±0.3的幂定律，与在其他区域中发现的相似，但比某些局部IMF的确定略小。与以前的研究一致，我们的调查显示，密集的核在云量和总质量中所占的比重很小。它们几乎都被限制在A_V≥9 mag的区域内，该阈值比以前的阈值低。

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