AN INITIAL MASS FUNCTION STUDY OF THE DWARF STARBURST GALAXY NGC 4214
AN INITIAL MASS FUNCTION STUDY OF THE DWARF STARBURST GALAXY NGC 4214
复制标题
矮星爆星系 NGC 4214 的初步质量函数研究
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Hwihyun Kim
中科院分区：
文献类型：
--
作者：
J. E. Andrews;D. Calzetti;R. Chandar;J. Lee;J. Lee;B. Elmegreen;R. Kennicutt;B. Whitmore;J. Kissel;Robert L. da Silva;M. Krumholz;R. O’Connell;M. Dopita;M. Dopita;J. Frogel;Hwihyun Kim
利用多波长哈勃太空望远镜WFC3数据，探测了邻近不规则星系NGC 4214中年轻（≥8 Myr）、未解析星团中电离光子的产生率。我们用星团质量归一化电离光子率来研究恒星初始质量函数（IMF）的上端。我们发现，在不确定度范围内，恒星IMF的上端在这个星系中似乎是普遍的，而与通用IMF的偏差可以归因于质量为103 M☉的星团中的恒星的随机抽样。此外，我们还发现，恒星的最大质量似乎与星团的质量无关。我们还发现，对于大质量的星团，反馈可能会导致Hα光度的代表性不足，这在进行这种类型的分析时需要考虑到。
The production rate of ionizing photons in young (⩽8 Myr), unresolved stellar clusters in the nearby irregular galaxy NGC 4214 is probed using multi-wavelength Hubble Space Telescope WFC3 data. We normalize the ionizing photon rate by the cluster mass to investigate the upper end of the stellar initial mass function (IMF). We have found that within the uncertainties the upper end of the stellar IMF appears to be universal in this galaxy, and that deviations from a universal IMF can be attributed to stochastic sampling of stars in clusters with masses ⪅103 M☉. Furthermore, we have found that there does not seem to be a dependence of the maximum stellar mass on the cluster mass. We have also found that for massive clusters, feedback may cause an underrepresentation in Hα luminosities, which needs to be taken into account when conducting this type of analysis.