New colour–mass-to-light relations: the role of the asymptotic giant branch phase and of interstellar dust
New colour–mass-to-light relations: the role of the asymptotic giant branch phase and of interstellar dust
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DOI：
10.1093/mnras/stt071
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发表时间：
2013-01
影响因子：
4.8
通讯作者：
T. Into;L. Portinari
中科院分区：
文献类型：
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作者：
T. Into;L. Portinari
颜色-M/L(质光)关系是推导外部星系恒星质量的一种流行方法。恒星质量的估计通常依赖于近红外(NIR)光度测量，因为它几乎不受尘埃和最近恒星形成事件的“结霜”效应的影响，因此被认为是一种最佳的示踪器。然而，最近的文献强调，近红外M/L比的理论估计强烈地依赖于渐近巨枝(AGB)相的模拟。我们使用最新的Padova等时线，以及对热脉冲AGB相的详细模拟，更新了光学和近红外中的理论颜色-M/L关系，并讨论了它对外部星系恒星质量估计的影响。我们还讨论了星际尘埃的衰减对大样本星系统计情况下的色-M/L关系的影响。
Colour-M/L (mass-to-light) relations are a popular recipe to derive stellar mass in external galaxies. Stellar mass estimates often rely on near infrared (NIR) photometry, considered an optimal tracer since it is little affected by dust and by the "frosting" effect of recent star formation episodes. However, recent literature has highlighted that theoretical estimates of the NIR M/L ratio strongly depend on the modelling of the Asymptotic Giant Branch (AGB) phase. We use the latest Padova isochrones, with detailed modelling of the Thermally Pulsing AGB phase, to update theoretical colour-M/L relations in the optical and NIR and discuss the consequences for the estimated stellar masses in external galaxies. We also discuss the effect of attenuation by interstellar dust on colour-M/L relations in the statistical case of large galaxy samples.