Environmental dependence of the H i mass function in the ALFALFA 70% catalogue
Environmental dependence of the H i mass function in the ALFALFA 70% catalogue
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DOI：
10.1093/mnras/stw263
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发表时间：
2015-10
影响因子：
4.8
通讯作者：
Michael G. Jones;E. Papastergis;M. Haynes;R. Giovanelli
中科院分区：
文献类型：
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作者：
Michael G. Jones;E. Papastergis;M. Haynes;R. Giovanelli
我们寻找环境依赖性的H我的质量函数在阿雷西博遗产快速ALFA调查（ALCAFA）70%的目录。根据斯隆数字巡天（SDSS）和2MASS红移巡天（2MRS）体积有限参考星表中发现的预测邻居密度，星表被分成环境密度的四分位数。我们发现Schechter函数"膝关节"质量依赖于环境，在最低和最高密度四分位数之间，log（M-*/M-圆点）的值从9.81 +/-0.02变为10.00 +/-0.03。然而，这种依赖性仅在基于SDSS参考目录定义环境时观察到，而不是2MRS。我们将这些结果解释为意味着当地环境是M-* 转变的主要原因，并且2MRS探针（与SDSS相比）的较大尺度几乎无关。此外，我们还使用固定孔径法探测环境，并发现初步证据表明，H I缺乏压低的M-* 值的最高密度区。我们发现，在任何测试中，使用这两种方法的低质量的斜坡对环境没有显着的依赖性。这些结果之间的紧张局势和那些从文献中，进行了讨论，并探讨了替代解释。
We search for environmental dependence of the H I mass function in the Arecibo Legacy Fast ALFA survey (ALFALFA) 70 per cent catalogue. The catalogue is split into quartiles of environment density based on the projected neighbour density of neighbours found in both Sloan Digital Sky Survey (SDSS) and 2MASS Redshift Survey (2MRS) volume-limited reference catalogues. We find the Schechter function 'knee' mass to be dependent on environment, with the value of log(M-*/M-circle dot) shifting from 9.81 +/- 0.02 to 10.00 +/- 0.03 between the lowest and highest density quartiles. However, this dependence was only observed when defining environment based on the SDSS reference catalogue, not 2MRS. We interpret these results as meaning that the local environment is the dominant cause of the shift in M-*, and that the larger scales that 2MRS probes (compared to SDSS) are almost irrelevant. In addition, we also use a fixed aperture method to probe environment, and find tentative evidence that H I-deficiency depresses the value of M-* in the highest density regions. We find no significant dependence of the low-mass slope on environment in any test, using either method. Tensions between these results and those from the literature, are discussed and alternative explanations are explored.