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arXiv 1105.5219astro-ph.CO
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M33(HerM33es)中的恒星形成

Star formation in M33 (HerM33es)

C. Kramer, M. Boquien, J. Braine, C. Buchbender, D. Calzetti, P. Gratier, B. Mookerjea, M. Relano, S. Verley

摘要:

在重点项目“Herschel M33扩展巡天”(HerM33es)中,我们正在研究附近星系M33中驱动恒星形成和星系演化的物理和化学过程,将影响单个恒星形成的局部条件的研究与只有在全球范围内才变得明显的性质相结合。在这里,我们介绍了HerM33es团队最近获得的结果。结合斯皮策和赫歇尔数据,从3.6微米到500微米,随着HI,Halalpha,和GALEX紫外数据,我们研究了尘埃在150 pc的高空间分辨率,提供估计的总红外(TIR)亮度和恒星形成率。虽然高亮度的温暖尘埃的温度是由年轻的大质量恒星驱动的,但演化的恒星星族似乎驱动了冷尘埃的温度。光子主导区域(PDR)的平面平行模型未能完全再现在M33的一个2'x2'子区域的第一次光谱研究中获得的[CII],[OI]和CO地图,该子区域位于内部,北旋臂并包含HII区域BCLMP 302。

英文摘要:

Within the key project "Herschel M33 extended survey" (HerM33es), we are studying the physical and chemical processes driving star formation and galactic evolution in the nearby galaxy M33, combining the study of local conditions affecting individual star formation with properties only becoming apparent on global scales. Here, we present recent results obtained by the HerM33es team. Combining Spitzer and Herschel data ranging from 3.6um to 500um, along with HI, Halpha, and GALEX UV data, we have studied the dust at high spatial resolutions of 150pc, providing estimators of the total infrared (TIR) brightness and of the star formation rate. While the temperature of the warm dust at high brightness is driven by young massive stars, evolved stellar populations appear to drive the temperature of the cold dust. Plane-parallel models of photon dominated regions (PDRs) fail to reproduce fully the [CII], [OI], and CO maps obtained in a first spectroscopic study of one 2'x2' subregion of M33, located on the inner, northern spiral arm and encompassing the HII region BCLMP302.

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