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arXiv 1510.08097astro-ph.GA
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CLASH-VLT星团MACS J1206 .2-0847中的光度函数:潮汐相互作用的重要性

Luminosity functions in the CLASH-VLT cluster MACS J1206.2-0847: the importance of tidal interactions

A. Mercurio, M. Annunziatella, A. Biviano, M. Nonino, P. Rosati, I. Balestra, M. Brescia, M. Girardi, R. Gobat, C. Grillo, M. Lombardi, B. Sartoris, the CLASH-VLT team

摘要:

利用HST和SUBARU的观测数据,给出了CLASH-VLT星系团MACS J1206.2-0847(z=0.439)的光学光度函数,其中包括600个已被光谱学证实的成员星系。SUBARU FoV上的LF可以很好地用一个Schechter函数描述,该函数的值可低至M~M*+3,而HST数据的拟合效果较差,因为在M~M*+7下可以看到一个微弱的端部向上翻转,这表明了一种双峰行为。我们还调查了当地环境的影响,推导出的LF在四个不同的地区,根据距离中心,发现增加的暗端斜率从核心到外环。我们的结果证实并扩展了我们以前关于质量函数分析的结果,即恒星质量在10^10.5,Msun以下的星系受到潮汐相互作用的显著影响,从而对团内光有贡献.

英文摘要:

We present the optical luminosity functions (LFs) of galaxies for the CLASH-VLT cluster MACS J1206.2-0847 at z=0.439, based on HST and SUBARU data, including ~600 spectroscopically confirmed member galaxies. The LFs on the wide SUBARU FoV are well described by a single Schechter function down to M~M*+3, whereas this fit is poor for HST data, due to a faint-end upturn visible down M~M*+7, suggesting a bimodal behaviour. We also investigate the effect of local environment by deriving the LFs in four different regions, according to the distance from the centre, finding an increase in the faint-end slope going from the core to the outer rings. Our results confirm and extend our previous findings on the analysis of mass functions, which showed that the galaxies with stellar mass below 10^10.5, M_sun have been significantly affected by tidal interaction effects, thus contributing to the intra cluster light.

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