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arXiv 1102.1032astro-ph.GA
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Bolocam银道巡天源恒星形成活动的中红外普查

A Mid-Infrared Census of Star Formation Activity in Bolocam Galactic Plane Survey Sources

Miranda K. Dunham, Thomas P. Robitaille, Neal J. Evans, Wayne M. Schlingman, Claudia J. Cyganowski, James Urquhart

摘要:

我们提出的搜索结果中红外线迹象的恒星形成活动的1.1毫米来源的Bolocam银河系平面调查(BGPS)。我们已经将BGPS星表与基于斯皮策空间望远镜GLIMPSE遗留巡天和中途空间实验(MSX)银河平面巡天的中红外银河平面星表进行了关联。我们发现,44%(8,358个中的3,712个)的BGPS源包含至少一个中红外源,包括所有调查重叠(10度<1 < 65度)的区域内的5,067个中的2,457个(49%)。考虑到BGPS和中红外源之间的机会对准,我们保守估计,在所有调查重叠的区域内,20%的BPGS源显示出活跃恒星形成的迹象。我们把BGPS源分为四组的基础上,他们的恒星形成活动的概率。扩展的绿色物体(EGO)和红色MSX源(RMS)组成了最高概率组,而最低概率组由“无星”BGPS源组成,这些源与任何中红外源都不匹配。每组的平均1.1毫米通量随着活跃恒星形成概率的增加而增加。我们还发现,“无星”的BGPS源是最紧凑的,而与最高的恒星形成活动的可能性的来源,平均更多的扩展与大裙的排放。280个已知距离的BGPS源的子样本表明,质量和平均H_2柱密度也随着恒星形成活动的概率而增加。

英文摘要:

We present the results of a search for mid-infrared signs of star formation activity in the 1.1 mm sources in the Bolocam Galactic Plane Survey (BGPS). We have correlated the BGPS catalog with available mid-IR Galactic plane catalogs based on the Spitzer Space Telescope GLIMPSE legacy survey and the Midcourse Space Experiment (MSX) Galactic plane survey. We find that 44% (3,712 of 8,358) of the BGPS sources contain at least one mid-IR source, including 2,457 of 5,067 (49%) within the area where all surveys overlap (10 deg < l < 65 deg). Accounting for chance alignments between the BGPS and mid-IR sources, we conservatively estimate that 20% of the BPGS sources within the area where all surveys overlap show signs of active star formation. We separate the BGPS sources into four groups based on their probability of star formation activity. Extended Green Objects (EGOs) and Red MSX Sources (RMS) make up the highest probability group, while the lowest probability group is comprised of "starless" BGPS sources which were not matched to any mid-IR sources. The mean 1.1 mm flux of each group increases with increasing probability of active star formation. We also find that the "starless" BGPS sources are the most compact, while the sources with the highest probability of star formation activity are on average more extended with large skirts of emission. A subsample of 280 BGPS sources with known distances demonstrates that mass and mean H_2 column density also increase with probability of star formation activity.

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