Star-forming Environments throughout the M101 Group

Star-forming Environments throughout the M101 Group
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整个 M101 集团的造星环境

DOI:
10.3847/1538-4357/aa8fcd
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发表时间:
2017
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
P. Harding
P. Harding
中科院分区:
--
文献类型:
--
作者:
A. Watkins;A. Watkins;J. C. Mihos;P. Harding

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我们介绍了一项对附近M101群内恒星形成的多波长研究,包括M101及其两个伴星的新的深层Hα成像。我们对位于三个不同环境中的HⅡ区的Hα-FUV通量比进行了统计分析:M101‘S内盘、M101’S外盘和M101‘S低质量伴星系NGC5474。我们发现,一旦考虑到消光的整体径向趋势,在所有这些环境中,HⅡ区的FHα/FFUV的中值和散度都是不变的。此外,使用StarBurst99模型,我们能够使用标准的Kroupa初始质量函数定性地再现FHα/FFUV在这些不同环境中的分布;因此,即使在极低的表面密度下,我们也不需要在IMF的高质量端调用截断来解释M101群中的年轻恒星形成区。这意味着,低密度环境中的恒星形成与高密度环境中的恒星形成只在强度上不同,而不是在云到云的物理上。
We present a multiwavelength study of star formation within the nearby M101 Group, including new deep Hα imaging of M101 and its two companions. We perform a statistical analysis of the Hα-to-FUV flux ratios in H ii regions located in three different environments: M101's inner disk, M101's outer disk, and M101's lower-mass companion galaxy NGC 5474. We find that, once bulk radial trends in extinction are taken into account, both the median and scatter in FHα/FFUV in H ii regions are invariant across all of these environments. Also, using Starburst99 models, we are able to qualitatively reproduce the distributions of FHα/FFUV throughout these different environments using a standard Kroupa initial mass function (IMF); hence, we find no need to invoke truncations in the upper-mass end of the IMF to explain the young star-forming regions in the M101 Group even at extremely low surface density. This implies that star formation in low-density environments differs from star formation in high-density environments only by intensity and not by cloud-to-cloud physics.
通过测量图案速度的径向变化来揭示螺旋结构的起源
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影响因子: --
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