论文标题
恒星，气态和恒星形成磁盘之间的关系小矮化的不规则星系：间接证据证明了深色分子气体的大量部分
Relationships between the Stellar, Gaseous, and Star Formation Disks in LITTLE THINGS Dwarf Irregular Galaxies: Indirect Evidence for Substantial Fractions of Dark Molecular Gas
论文作者
论文摘要
在附近DIRR的小东西样本中，恒星，气态和年轻的恒星磁盘配备了函数，以搜索参数之间的相关性。我们发现，HI径向剖面通常在中心倾斜，在外部区域比V波段轮廓更快，而年轻的恒星则更为集中，尤其是如果HI更为中心平坦。这种模式表明，HI正在中心的分子变成分子，分子云正在形成恒星和fuv。假设分子表面密度与总气体表面密度与1.5或2的功率成正比的模型，与Kennicutt-schmidt关系类似，可以再现可见量表长度与HI量表长度与HI Sersic Intex的比率之间的关系。通过使用常规校准将FUV转换为分子表面密度，将分子分数估计为每个星系的半径函数。 3R_D内部的平均分子分数为23 +/- 17％。但是，恒星表面亮度轮廓的破裂没有与恒星形成相关的统一示踪剂。
The stellar, gaseous and young stellar disks in the LITTLE THINGS sample of nearby dIrrs are fitted with functions to search for correlations between the parameters. We find that the HI radial profiles are generally flatter in the center and fall faster in the outer regions than the V-band profiles, while young stars are more centrally concentrated, especially if the HI is more centrally flat. This pattern suggests that the HI is turning into molecules in the center and the molecular clouds are forming stars and FUV. A model that assumes the molecular surface density is proportional to the total gas surface density to a power of 1.5 or 2, in analogy with the Kennicutt-Schmidt relation, reproduces the relationship between the ratio of the visible to the HI scale length and the HI Sersic index. The molecular fraction is estimated as a function of radius for each galaxy by converting the FUV to a molecular surface density using conventional calibrations. The average molecular fraction inside 3R_D is 23+/-17%. However, the break in the stellar surface brightness profile has no unified tracer related to star formation.
