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arXiv 0706.1809astro-ph
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斯皮策c2d大型邻近星际云巡天。IV。使用MIPS观察到狼疮

The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds. IV. Lupus Observed with MIPS

Nicholas L. Chapman, Shih-Ping Lai, Lee G. Mundy, Neal J. Evans, Timothy Y. Brooke, Lucas A. Cieza, William J. Spiesman, Luisa M. Rebull, Karl R. Stapelfeldt, A… 展开作者

Nicholas L. Chapman, Shih-Ping Lai, Lee G. Mundy, Neal J. Evans, Timothy Y. Brooke, Lucas A. Cieza, William J. Spiesman, Luisa M. Rebull, Karl R. Stapelfeldt, Alberto Noriega-Crespo, Lauranne Lanz, Lori E. Allen, Geoffrey A. Blake, Tyler L. Bourke, Paul M. Harvey, Tracy L. Huard, Jes K. Jørgensen, David W. Koerner, Philip C. Myers, Deborah L. Padgett, Annelia I. Sargent, Peter Teuben, Ewine F. van Dishoeck, Zahed Wahhaj, Kaisa E. Young

摘要:

我们目前的地图7.78平方度的狼疮分子云复杂的24,70,和$160\:μ$ m。它们是用斯皮策太空望远镜的斯皮策多波段成像光度计(MIPS)仪器制作的,作为斯皮策遗产计划“从分子核心到行星形成盘”(c2d)的一部分。这些地图覆盖了狼疮的三个独立区域,分别表示为I、III和IV。我们讨论了c2d管道以及我们的数据处理与它的不同之处。我们将这三个区域的源计数与其他两个数据集进行了比较,并从Wainscoat模型中预测了恒星计数。这个比较显示了来自狼疮I中背景星系的贡献。我们还使用2MASS和MIPS数据创建了两个彩色星等图。从这些结果中,我们可以识别背景星系,并将它们与可能的年轻恒星物体区分开来。在我们的目录中的源进行分类的基础上,他们的光谱能量分布(SED)从2MASS和斯皮策波长创建一个样本的年轻恒星天体候选人。从2MASS数据,我们创建每个区域的消光图,并注意到消光和$160\:μ$ m发射之间的强烈对应。我们从灭绝图中得出的每个狼疮云的质量与从$^{13}$ CO和C $^{18}$ O估计的质量进行了比较,发现在某些地区与我们的灭绝质量相似,但在其他地区则明显不同。最后,根据我们的色星等图,我们选择了12个最红的候选年轻恒星天体进行单独讨论。这12颗卫星中有5颗似乎是新发现的YSO。

英文摘要:

We present maps of 7.78 square degrees of the Lupus molecular cloud complex at 24, 70, and $160\:μ$m. They were made with the Spitzer Space Telescope's Multiband Imaging Photometer for Spitzer (MIPS) instrument as part of the Spitzer Legacy Program, ``From Molecular Cores to Planet-Forming Disks'' (c2d). The maps cover three separate regions in Lupus, denoted I, III, and IV. We discuss the c2d pipeline and how our data processing differs from it. We compare source counts in the three regions with two other data sets and predicted star counts from the Wainscoat model. This comparison shows the contribution from background galaxies in Lupus I. We also create two color magnitude diagrams using the 2MASS and MIPS data. From these results, we can identify background galaxies and distinguish them from probable young stellar objects. The sources in our catalogs are classified based on their spectral energy distribution (SED) from 2MASS and Spitzer wavelengths to create a sample of young stellar object candidates. From 2MASS data, we create extinction maps for each region and note a strong corresponence between the extinction and the $160\:μ$m emission. The masses we derived in each Lupus cloud from our extinction maps are compared to masses estimated from $^{13}$CO and C$^{18}$O and found to be similar to our extinction masses in some regions, but significantly different in others. Finally, based on our color-magnitude diagrams, we selected 12 of our reddest candidate young stellar objects for individual discussion. Five of the 12 appear to be newly-discovered YSOs.

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