论文标题
使用Sofia/Forcast Imaging完成Cygnus-X中的原始亮度功能
Completing the Protostellar Luminosity Function in Cygnus-X with SOFIA/FORCAST Imaging
论文作者
论文摘要
我们提出了一项新的索非亚/forcast Mid-IR调查，对Cygnus X中的发光质恒星和拥挤的星形成环境，这是最近的百万 - 极性质量分子云配合物。我们通过这些新数据与现存的Spitzer和Ukidss光度法相结合，为该地区的1000多个来源提供了横光度照明，并通过高质量的Sofia/Forcast数据确定了63个新的发光Protostar候选者。通过包含预播数据，我们构建了高光度末端完整性的Protostellar Luminusity函数（PLF）。 PLF通过〜-0.5索引的功率法函数很好地描述了PLF。基于Herschel温度和柱密度测量值，我们发现PLF对局部气体温度没有明显的依赖性，但是高恒星密度或气柱密度区域中的PLF在较高的亮度下表现出多余的。通过我们观察到的PLF和现有积聚模型之间的比较，湍流核心（TC）和竞争增积分（CA）模型都与我们的结果一致，而等温球（IS）模型却不利。讨论了这些结果对恒星形成过程的含义。
We present a new SOFIA/FORCAST mid-IR survey of luminous protostars and crowded star-forming environments in Cygnus X, the nearest million-solar mass molecular cloud complex. We derive bolometric luminosities for over 1000 sources in the region with these new data in combination with extant Spitzer and UKIDSS photometry, with 63 new luminous protostar candidates identified by way of the high quality SOFIA/FORCAST data. By including FORCAST data, we construct protostellar luminosity functions (PLFs) with improved completeness at the high luminosity end. The PLFs are well described by a power law function with an index of ~-0.5. Based on the Herschel temperature and column density measurements, we find no obvious dependence of the PLFs on the local gas temperature, but PLFs in regions of high stellar density or gas column density exhibit some excess at higher luminosities. Through the comparison between our observed PLFs and existing accretion models, both the turbulent core (TC) and the competitive accretion (CA) models are consistent with our results, while the isothermal sphere (IS) model is disfavored. The implications of these results on the star formation process are discussed.
