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arXiv 1104.2379astro-ph.CO
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星系与质量组合(GAMA):恒星初始质量函数对恒星形成率的依赖

Galaxy And Mass Assembly (GAMA): The star formation rate dependence of the stellar initial mass function

M. L. P. Gunawardhana, A. M. Hopkins, R. G. Sharp, S. Brough, E. Taylor, J. Bland-Hawthorn, C. Maraston, R. J. Tuffs, C. C. Popescu, D. Wijesinghe, D. H. Jones,… 展开作者

M. L. P. Gunawardhana, A. M. Hopkins, R. G. Sharp, S. Brough, E. Taylor, J. Bland-Hawthorn, C. Maraston, R. J. Tuffs, C. C. Popescu, D. Wijesinghe, D. H. Jones, S. Croom, E. Sadler, S. Wilkins, S. P. Driver, J. Liske, P. Norberg, I. K. Baldry, S. P. Bamford, J. Loveday, J. A. Peacock, A. S. G. Robotham, D. B. Zucker, Q. A. Parker, C. J. Conselice, E. Cameron, C. S. Frenk, D. T. Hill, L. S. Kelvin, K. Kuijken, B. F. Madore, B. Nichol, H. R. Parkinson, K. A. Pimbblet, M. Prescott, W. J. Sutherland, D. Thomas, E. van Kampen

摘要:

恒星初始质量函数(IMF)描述了恒星形成爆发产生的恒星质量分布。五十多年来,国际货币基金组织大多数研究领域的隐含假设一直是,无论时间和环境如何,它都是普遍的。我们测量的低到中等红移星系的星系和质量大会调查的样本的高质量IMF斜率。大范围的亮度和星系质量的样本允许探索潜在的IMF的依赖关系。一个强大的IMF的恒星形成率的依赖性被发现,这表明,高恒星形成星系形成比例更大质量的恒星(他们有IMF与平坦的幂律斜率)比星系低恒星形成率。这对各种各样的星系演化研究产生了重大影响,所有这些研究都依赖于IMF斜率的假设。我们的结果是支持的,并提供了一个解释,最近的许多探索的结果表明,在国际货币基金组织的变化或演变。

英文摘要:

The stellar initial mass function (IMF) describes the distribution in stellar masses produced from a burst of star formation. For more than fifty years, the implicit assumption underpinning most areas of research involving the IMF has been that it is universal, regardless of time and environment. We measure the high-mass IMF slope for a sample of low-to-moderate redshift galaxies from the Galaxy And Mass Assembly survey. The large range in luminosities and galaxy masses of the sample permits the exploration of underlying IMF dependencies. A strong IMF-star formation rate dependency is discovered, which shows that highly star forming galaxies form proportionally more massive stars (they have IMFs with flatter power-law slopes) than galaxies with low star formation rates. This has a significant impact on a wide variety of galaxy evolution studies, all of which rely on assumptions about the slope of the IMF. Our result is supported by, and provides an explanation for, the results of numerous recent explorations suggesting a variation of or evolution in the IMF.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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