利用吸收线强度数据的量身定做的星系模型
Made-to-measure galaxy modelling utilising absorption line strength data
摘要：
我们增强了Syer & Tremaine的量身定制（M2M）粒子方法的恒星动力学建模模型同时运动学数据和吸收线强度数据，从而创建一个“化学M2M”建模方案。我们应用增强的方法，四个星系（NGC 1248，NGC 3838，NGC 4452，NGC 4551）观察使用SAURON积分场摄谱仪作为ATLAS 3D程序的一部分。我们能够成功地再现2D线强度数据，实现每个仓的平均chi ^2值约为1，其中> 95%的粒子具有收敛的权重。由于M2M使用3D粒子系统，我们还能够检查底层的3D线强度分布。这些分布在多大程度上是真实星系的合理表示，需要进一步考虑。总的来说，我们认为建模工作是开发“化学-M2M”建模系统和理解一些有待解决的问题的有希望的第一步。虽然量身定做的技术已被应用于吸收线强度数据，他们实际上是一般性的，并可能在模拟星系的其他方面的价值。
英文摘要：
We enhance the Syer & Tremaine made-to-measure (M2M) particle method of stellar dynamical modelling to model simultaneously both kinematic data and absorption line strength data thus creating a `chemo-M2M' modelling scheme. We apply the enhanced method to four galaxies (NGC 1248, NGC 3838, NGC 4452, NGC 4551) observed using the SAURON integral-field spectrograph as part of the ATLAS3D programme. We are able to reproduce successfully the 2D line strength data achieving mean chi^2 per bin values of ~1 with >95\% of particles having converged weights. Because M2M uses a 3D particle system, we are also able to examine the underlying 3D line strength distributions. The extent to which these distributions are plausible representations of real galaxies requires further consideration. Overall we consider the modelling exercise to be a promising first step in developing a `chemo-M2M' modelling system and in understanding some of the issues to be addressed. Whilst the made-to-measure techniques developed have been applied to absorption line strength data, they are in fact general and may be of value in modelling other aspects of galaxies.
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