CONNECTING THE DOTS: ANALYZING SYNTHETIC OBSERVATIONS OF STAR-FORMING CLUMPS IN MOLECULAR CLOUDS

被引:13
作者
Ward, Rachel L. [1 ]
Wadsley, James [1 ]
Sills, Alison [1 ]
Petitclerc, Nicolas [1 ]
机构
[1] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
ISM: clouds; ISM: structure; stars: formation; stars: luminosity function; mass function; MASS FUNCTION; DENSE CORES; INITIAL CONDITIONS; DARK CLOUDS; SIMULATIONS; STELLAR; EVOLUTION; CLUSTERS; PERSEUS; IMPLEMENTATION;
D O I
10.1088/0004-637X/756/2/119
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In this paper, we investigate the extent to which observations of molecular clouds can correctly identify and measure star-forming clumps. We produced a synthetic column density map and a synthetic spectral-line data cube from the simulated collapse of a 5000 M-circle dot molecular cloud. By correlating the clumps found in the simulation to those found in the synthetic observations, clump masses derived from spectral-line data cubes were found to be quite close to the true physical properties of the clumps. We also find that the "observed" clump mass function (CMF) derived from the column density map is shifted by a factor of similar to 3 higher than the true CMF, due to projection of low-density material along the line of sight. Alves et al. first proposed that a shift of a CMF to higher masses by a factor of three can be attributed to a star formation efficiency of 30%. Our results indicate that this finding may instead be due to an overestimate of clump masses determined from column density observations.
引用
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页数:7
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