期刊
ASTRONOMICAL JOURNAL
卷 143, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/143/6/139
关键词
galaxies: fundamental parameters; galaxies: stellar content; Magellanic Clouds
资金
- NASA LTSA [NNG05GE82G]
- NSF [AST-0307482, AST-0907771]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0907771] Funding Source: National Science Foundation
We use high spatial resolution maps of stellar mass and infrared flux of the Large Magellanic Cloud (LMC) to calibrate a conversion between 3.6 and 4.5 mu m fluxes and stellar mass, M-* = 10(5.65) F-3.6(2.85) F-4.5(-1.85) (D/0.05)(2) M-circle dot,where fluxes are in Jy and D is the luminosity distance to the source in Mpc, and to provide an approximate empirical estimate of the fractional internal uncertainty in M* of 0.3 root N/10(6), where N is the number of stars in the region. We find evidence that young stars and hot dust contaminate the measurements, but attempts to remove this contamination using data that are far superior to what are generally available for unresolved galaxies resulted in marginal gains in accuracy. The scatter among mass estimates for regions in the LMC is comparable to that found by previous investigators when modeling composite populations, and so we conclude that our simple conversion is as precise as possible for the data and models currently available. Our results allow for a reasonably bottom-heavy initial mass function, such as Salpeter or heavier, and moderately disfavor lighter versions such as a diet-Salpeter or Chabrier initial mass function.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据