The population of the Galactic plane as seen by MSX
The population of the Galactic plane as seen by MSX
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DOI：
10.1046/j.1365-8711.2002.05785.x
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发表时间：
2002-06
影响因子：
4.8
通讯作者：
S. Lumsden;M. Hoare;R. D. Oudmaijer;D. Richards
中科院分区：
文献类型：
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作者：
S. Lumsden;M. Hoare;R. D. Oudmaijer;D. Richards
MSX卫星使命的中红外数据和地面近红外测光结合起来，用于确定银道面中红外总体的特性。最年轻的源仍然深深地嵌入在它们的纳塔尔分子云中，它们的颜色通常不同于那些笼罩在自己的尘埃壳中的演化恒星。我们的主要动机是使用MSX无偏搜索大规模年轻恒星天体（MYSO）的大样本（1000）。一个简单的分析表明，MSX点源目录应该包含我们银河系内的大多数MYSO。我们开发的颜色选择标准，使用组合的近红外和中红外数据MYSO，产生了3071个对象的列表，不包括银河系中心区域。后续观测方案已经在进行中，以分离的MYSO紧凑H II地区和其他剩余的对象进行了简要介绍。我们还表明，这些数据可以使用，就像IRAS数据以前，提供了一个富碳和富氧尘埃的演化恒星之间的分离。这些数据也可以用来寻找正常主序星周围尘埃的证据，例如低质量的前主序星或织女星过剩类天体，其中碎片盘被认为是行星形成过程中留下的。我们讨论的准确性和完整性的MSX点源目录，并表明，目前的错误往往是一种我们在本文中讨论的主要恒星种群是不显着的。
The combination of mid-infrared data from the MSX satellite mission and ground-based near-infrared photometry is used to characterize the properties of the mid-infrared population of the Galactic plane. The colours of the youngest sources still heavily embedded within their natal molecular clouds are in general different from those of evolved stars shrouded within their own dust shells. Our main motivation is to use MSX for an unbiased search for a large (∼1000) sample of massive young stellar objects (MYSOs). A simple analysis shows that the MSX point-source catalogue should contain most of the MYSOs within our Galaxy. We develop colour-selection criteria using combined near- and mid-infrared data for MYSOs, which produces a list of 3071 objects, excluding the Galactic Centre region. The programme of follow-up observations already under way to separate the MYSOs from compact H ii regions and other remaining objects is briefly described. We also show that these data can be used, just as IRAS data have been previously, to provide a separation between evolved stars with carbon-rich and oxygen-rich dust. These data may also be used to search for evidence of dust around normal main-sequence stars, such as low-mass pre-main-sequence stars or the Vega-excess class of objects where debris discs are presumed to remain from the planet formation process. We discuss the accuracy and completeness of the MSX point-source catalogue, and show that the errors present tend to be of a kind that is not significant for the main stellar populations we discuss in this paper.