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arXiv 1309.4497astro-ph.SR
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MYStIX InfraRed-Excess源目录

The MYStIX InfraRed-Excess Source Catalog

Matthew S. Povich, Michael A. Kuhn, Konstantin V. Getman, Heather A. Busk, Eric D. Feigelson, Patrick S. Broos, Leisa K. Townsley, Robert R. King, Tim Naylor

摘要:

MYStIX项目(大质量年轻恒星形成复合体的红外和X射线研究)提供了对20个银河系大质量恒星形成复合体(d = 0.4至3.6 kpc)的比较研究。每个目标复合体中可能的恒星成员通过两种途径使用X射线和/或红外数据来识别:(1)具有日冕活动/强风的年轻/大质量恒星的X射线探测;或(2)具有拱星盘和/或原恒星包层的年轻恒星物体(YSO)的红外过量(IRE)选择。我们提出了第二种途径的方法,使用斯皮策/IRAC,2 MASS,和UKIRT成像和测光。虽然IRE选择YSO是一个很好的领域,但MYStIX提出了独特的挑战。我们结合红外光谱能量分布(SED)拟合与红外颜色切割和空间聚类分析,以确定IRE源和隔离可能的YSO成员在每个MYStIX目标领域的无数类型的污染源,可以类似于YSO:河外源,演化的恒星,星云结,甚至无关的前景/背景YSO。我们在18个目标复合体中始终如一地应用我们的方法,我们产生了MYStIX IRE源(MIRES)目录,包括20,719个源,其中包括MYStIX目标复合体的8686个可能的恒星成员。我们还将9365 IR对应物的SED分类为MYStIX X射线源,以协助第一条途径,即识别X射线检测到的恒星成员。MIRES星表为后续研究与大质量恒星团簇形成相关的各种现象提供了基础,这些现象包括原恒星外流、星周盘和由大质量恒星反馈过程触发的连续恒星形成。

英文摘要:

The MYStIX project (Massive Young Star-Forming Complex Study in Infrared and X-rays) provides a comparative study of 20 Galactic massive star-forming complexes (d = 0.4 to 3.6 kpc). Probable stellar members in each target complex are identified using X-ray and/or infrared data via two pathways: (1) X-ray detections of young/massive stars with coronal activity/strong winds; or (2) infrared excess (IRE) selection of young stellar objects (YSOs) with circumstellar disks and/or protostellar envelopes. We present the methodology for the second pathway, using Spitzer/IRAC, 2MASS, and UKIRT imaging and photometry. Although IRE selection of YSOs is welltrodden territory, MYStIX presents unique challenges. We combine IR spectral energy distribution (SED) fitting with IR color cuts and spatial clustering analysis to identify IRE sources and isolate probable YSO members in each MYStIX target field from the myriad types of contaminating sources that can resemble YSOs: extragalactic sources, evolved stars, nebular knots, and even unassociated foreground/background YSOs. Applying our methodology consistently across 18 of the target complexes, we produce the MYStIX IRE Source (MIRES) Catalog comprising 20,719 sources, including 8686 probable stellar members of the MYStIX target complexes. We also classify the SEDs of 9365 IR counterparts to MYStIX X-ray sources to assist the first pathway, the identification of X-ray detected stellar members. The MIRES catalog provides a foundation for follow-up studies of diverse phenomena related to massive star cluster formation, including protostellar outflows, circumstellar disks, and sequential star formation triggered by massive star feedback processes.

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