论文标题
将啤酒花扩展到500 parsecs(EHOPS)。 I. Aquila分子云中质体的鉴定和建模
Extension of HOPS Out to 500 ParSecs (eHOPS). I. Identification and Modeling of Protostars in the Aquila Molecular Clouds
论文作者
论文摘要
我们提出了一项针对Aquila分子云($ d \ sim 436 $ 〜p PC)的Spitzer/Herschel的调查,作为Ehops的一部分(将啤酒花扩展到500 parsecs)附近的原校普罗内斯特人普查。对于Herschel/PACS频段中检测到的每个来源,Ehops-Aquila目录中包含来自2mass,Spitzer,Herschel,Wise,Wise和JCMT/Scuba-2数据组装的1-850〜 $μ$ M SED。使用新开发的一组标准,我们通过其SED对象将其分类为原恒星,带磁盘的预MS序列星和星系。在Aquila中共有172个原始恒星,紧密地集中在云层的分子丝中。其中71个(42 \%)是0类Protostars,54(31 \%)是I类Protostars,43(25 \%)是平面光谱质体,4(2 \%)是II类。 0级Protostars中有10个是年轻的PACS明亮的红色源,类似于Orion中发现的PAC。我们将SED与辐射转移模型的网格进行了比较,以限制原恒星的亮度,包膜密度和包络质量。 A comparison of the eHOPS-Aquila to the HOPS protostars in Orion finds that the protostellar luminosity functions in the two star-forming regions are statistically indistinguishable, the bolometric temperatures/envelope masses of eHOPS-Aquila protostars are shifted to cooler temperatures/higher masses, and the eHOPS-Aquila protostars do not show the decline in luminosity with在猎户座中发现的进化。我们简要讨论这些差异是否是由于样品之间的偏见,不同的恒星形成历史或环境对原恒星进化的影响。
We present a Spitzer/Herschel focused survey of the Aquila molecular clouds ($d \sim 436$~pc) as part of the eHOPS (extension of HOPS Out to 500 ParSecs) census of nearby protostars. For every source detected in the Herschel/PACS bands, the eHOPS-Aquila catalog contains 1-850~$μ$m SEDs assembled from 2MASS, Spitzer, Herschel, WISE, and JCMT/SCUBA-2 data. Using a newly developed set of criteria, we classify objects by their SEDs as protostars, pre-ms sequence stars with disks, and galaxies. A total of 172 protostars are found in Aquila, tightly concentrated in the molecular filaments that thread the clouds. Of these, 71 (42\%) are Class 0 protostars, 54 (31\%) are Class I protostars, 43 (25\%) are flat-spectrum protostars, and 4 (2\%) are Class II sources. Ten of the Class 0 protostars are young PACS Bright Red Sources similar to those discovered in Orion. We compare the SEDs to a grid of radiative transfer models to constrain the luminosities, envelope densities, and envelope masses of the protostars. A comparison of the eHOPS-Aquila to the HOPS protostars in Orion finds that the protostellar luminosity functions in the two star-forming regions are statistically indistinguishable, the bolometric temperatures/envelope masses of eHOPS-Aquila protostars are shifted to cooler temperatures/higher masses, and the eHOPS-Aquila protostars do not show the decline in luminosity with evolution found in Orion. We briefly discuss whether these differences are due to biases between the samples, diverging star formation histories, or the influence of environment on protostellar evolution.