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A STRUCTURAL ANALYSIS OF STAR-FORMING REGION AFGL 490

机译:星际区域AFGL 490的结构分析

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We present Spitzer IRAC and MIPS observations of the star-forming region containing intermediate-mass young stellar object (YSO) AFGL 490. We supplement these data with near-IR Two Micron All Sky Survey photometry and with deep Simultaneous Quad Infrared Imaging Device observations off the central high-extinction region. We have more than doubled the known membership of this region to 57 Class I and 303 Class II YSOs via the combined 1-24?μm photometric catalog derived from these data. We construct and analyze the minimum spanning tree of their projected positions, isolating one locally overdense cluster core containing 219 YSOs (60.8% of the region's members). We find this cluster core to be larger yet less dense than similarly analyzed clusters. Although the structure of this cluster core appears irregular, we demonstrate that the parsec-scale surface densities of both YSOs and gas are correlated with a power-law slope of 2.8, as found for other similarly analyzed nearby molecular clouds. We also explore the mass segregation implications of AFGL 490's offset from the center of its core, finding that it has no apparent preferential central position relative to the low-mass members.
机译:我们介绍了包含中等质量年轻恒星物体(YSO)AFGL 490的恒星形成区域的Spitzer IRAC和MIPS观测结果。我们用近红外2微米全天候测量光度法和深同时四核红外成像仪观测值对这些数据进行了补充中央高消光区。通过从这些数据得出的合并的1-24?μm光度表,我们将该地区的已知成员增加了一倍以上,达到57个I类和303个II类YSO。我们构造并分析了它们的预计位置的最小生成树,从而隔离了一个包含219个YSO(占该区域成员的60.8%)的本地超重集群核心。我们发现该群集核心比类似分析的群集更大,但密度更低。尽管该簇核的结构看起来是不规则的,但我们证明了YSO和气体的Parsec级表面密度都与2.8的幂律斜率相关,正如在其他类似分析的附近分子云中所发现的那样。我们还研究了AFGL 490偏离其核心中心的质量偏析含义,发现相对于低质量成员而言,它没有明显的优先中心位置。

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