Made-to-measure galaxy modelling utilising absorption line strength data

作     者：R.J.Long 

作者机构：National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100012China Jodrell Bank Centre for AstrophysicsSchool of Physics and Astronomythe University of ManchesterOxford RoadManchester M13 9PLUK 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2016年第16卷第12期

页      面：89-100页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by the Strategic Priority Research Program“The Emergence of Cosmological Structures”of the Chinese Academy of Sciences(Grant No.XDB09000000) by the National Natural Science Foundation of China(NSFC,Grant Nos.11333003 and 11390372) 

主　　题：galaxies: abundances --galaxies: formation- galaxies: individual (NGC 1248 NGC 3838,NGC 4452 NGC 4551) -- galaxies: kinematics and dynamics -- galaxies: structure -- methods: numerical 

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 X2 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 dis- tributions 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. While 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.