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arXiv 0910.5665astro-ph.CO
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STAGES星系中恒星质量-尺寸关系的环境依赖性

The environmental dependence of the stellar mass-size relation in STAGES galaxies

David T. Maltby, Alfonso Aragón-Salamanca, Meghan E. Gray, Marco Barden, Boris Haeussler, Christian Wolf, Chien Y. Peng, Knud Jahnke, Daniel H. McIntosh, Asmus … 展开作者

David T. Maltby, Alfonso Aragón-Salamanca, Meghan E. Gray, Marco Barden, Boris Haeussler, Christian Wolf, Chien Y. Peng, Knud Jahnke, Daniel H. McIntosh, Asmus Boehm, Eelco van Kampen

摘要:

我们目前的恒星质量大小的关系,椭圆形,透镜状和螺旋星系的领域和集群环境中使用HST/ACS成像和数据从太空望远镜A901/2星系演化调查(阶段)。我们使用了一个大样本的~1200场和星系团星系,和一个子样本的星系团核心星系,并量化的意义上的恒星质量大小关系的任何推定的环境依赖。对于椭圆形、透镜状和高质量(log M*/M_sun > 10)的螺旋星系,我们没有发现任何证据表明存在这种环境依赖性,这意味着内部驱动因素正在控制它们的大小演化。对于中/低质量螺旋(log M*/M_sun < 10),我们发现了在2-sigma水平上显着的证据,表明可能的环境依赖于星系大小:低质量螺旋的平均有效半径a_e约为15- 20%在现场比在集群中大。这是由于人口的低质量大a_e场螺旋,这是在很大程度上缺席的集群环境。这些大a_e场螺旋包含了扩展的恒星盘,而这些恒星盘在星团中是不存在的。这表明这些螺旋星系脆弱的扩展恒星盘可能无法在星系团的环境条件下生存。我们的研究结果表明,内部物理过程是控制星系大小演化的主要驱动因素,环境可能只影响中/低质量螺旋盘。

英文摘要:

We present the stellar mass-size relations for elliptical, lenticular, and spiral galaxies in the field and cluster environments using HST/ACS imaging and data from the Space Telescope A901/2 Galaxy Evolution Survey (STAGES). We use a large sample of ~1200 field and cluster galaxies, and a sub-sample of cluster core galaxies, and quantify the significance of any putative environmental dependence on the stellar mass-size relation. For elliptical, lenticular, and high-mass (log M*/M_sun > 10) spiral galaxies we find no evidence to suggest any such environmental dependence, implying that internal drivers are governing their size evolution. For intermediate/low-mass spirals (log M*/M_sun < 10) we find evidence, significant at the 2-sigma level, for a possible environmental dependence on galaxy sizes: the mean effective radius a_e for lower-mass spirals is ~15-20 per cent larger in the field than in the cluster. This is due to a population of low-mass large-a_e field spirals that are largely absent from the cluster environments. These large-a_e field spirals contain extended stellar discs not present in their cluster counterparts. This suggests the fragile extended stellar discs of these spiral galaxies may not survive the environmental conditions in the cluster. Our results suggest that internal physical processes are the main drivers governing the size evolution of galaxies, with the environment possibly playing a role affecting only the discs of intermediate/low-mass spirals.

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