CONNECTION BETWEEN DYNAMICALLY DERIVED INITIAL MASS FUNCTION NORMALIZATION AND STELLAR POPULATION PARAMETERS
CONNECTION BETWEEN DYNAMICALLY DERIVED INITIAL MASS FUNCTION NORMALIZATION AND STELLAR POPULATION PARAMETERS
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DOI：
10.1088/2041-8205/792/2/l37
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发表时间：
2014-08
期刊：
影响因子：
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通讯作者：
R. McDermid;M. Cappellari;K. Alatalo;E. Bayet;L. Blitz;M. Bois;F. Bournaud;M. Bureau;A. Crocker;R. Davies;T. Davis;P. T. de Zeeuw;P. Duc;E. Emsellem;S. Khochfar;D. Krajnović;H. Kuntschner;R. Morganti;T. Naab;T. Oosterloo;M. Sarzi;N. Scott;P. Serra;A. Weijmans;L. Young
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文献类型：
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作者：
R. McDermid;M. Cappellari;K. Alatalo;E. Bayet;L. Blitz;M. Bois;F. Bournaud;M. Bureau;A. Crocker;R. Davies;T. Davis;P. T. de Zeeuw;P. Duc;E. Emsellem;S. Khochfar;D. Krajnović;H. Kuntschner;R. Morganti;T. Naab;T. Oosterloo;M. Sarzi;N. Scott;P. Serra;A. Weijmans;L. Young
我们的动态确定的恒星初始质量函数（IMF）和恒星的人口属性之间的经验趋势报告的一个完整的，体积有限的样本从ATLAS 3D项目的260个早期类型的星系。我们研究了我们动态导出的IMF归一化α dyn α（M/L）星/（M/L）Salp和吸收线强度之间的趋势，并通过单恒星种群等效年龄、丰度比（测量为[α/Fe]）和总金属丰度[Z/H]来解释这些趋势。我们发现，老年和α增强星系往往有平均较重（Salpeter样）的IMF质量归一化，但恒星的人口似乎并不是一个很好的预测IMF，在一个给定的人口参数的α dyn的大范围。结果，我们发现α dyn-[α/Fe]和α dyn − Age相关性较弱，α dyn − [Z/H]相关性不显著。观察到的趋势似乎显着弱于那些在研究中报告的测量IMF的正常化，通过低质量的星星人口推断，通过恒星光谱分析。
We report on empirical trends between the dynamically determined stellar initial mass function (IMF) and stellar population properties for a complete, volume-limited sample of 260 early-type galaxies from the ATLAS3D project. We study trends between our dynamically derived IMF normalization αdyn ≡ (M/L)stars/(M/L)Salp and absorption line strengths, and interpret these via single stellar population-equivalent ages, abundance ratios (measured as [α/Fe]), and total metallicity, [Z/H]. We find that old and alpha-enhanced galaxies tend to have on average heavier (Salpeter-like) mass normalization of the IMF, but stellar population does not appear to be a good predictor of the IMF, with a large range of αdyn at a given population parameter. As a result, we find weak αdyn–[α/Fe] and αdyn −Age correlations and no significant αdyn −[Z/H] correlation. The observed trends appear significantly weaker than those reported in studies that measure the IMF normalization via the low-mass star demographics inferred through stellar spectral analysis.