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arXiv 2006.07233astro-ph.GA
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具有光学AGN特征的矮星系环境

Environments of dwarf galaxies with optical AGN characteristics

Mikkel T. Kristensen, Kevin Pimbblet, Samantha Penny

摘要:

本研究旨在通过比较活动星系核和非活动星系核样品的邻域参数,探讨活动星系核与矮星系($M_* \leq 5\times10^9 M_\odot$)及其周围环境的关系。本文利用NASA-Sloan图集分析了具有$z \leq 0.055$的矮星系的局部环境和直接环境。在145,155个星表中,有62,258个星系被归类为矮星系,采用两种基于发射线通量的活动星系核选择方法(BPT和WHAN),发现4,476个星系核在光谱上具有活动星系核特征。无论选择方法,这项研究发现没有明显的差异,活动星系核和非活动星系核的宿主矮星系之间的环境,这些结果表明,环境不是一个重要的因素,在触发活动星系核活动的矮星系。这是符合现有文献的环境与AGN的规则星系,并建议在整个质量制度的环境反应的普遍性。讨论了活动星系核在低质量星系中的选择偏差,以及不同环境测量的偏差。发现发射线比有几种质量趋势,SDSS光纤覆盖的星系是不均匀的,并且有红移。这些偏见应占在未来的工作可能包括其他波长制度或质量加权的发射线比。最后,环境估计方法的讨论,因为他们可能无法衡量所需的属性,由于诸如时间延迟或使用松散约束的代理参数的因素。

英文摘要:

This study aims to explore the relation between dwarf galaxies ($M_* \leq 5\times10^9 M_\odot$) with AGNs and their environment by comparing neighbourhood parameters of AGN and non-AGN samples. Using the NASA-Sloan Atlas, both the local environment and the immediate environment of dwarf galaxies with $z \leq 0.055$ are analysed. Of the 145,155 galaxies in the catalogue, 62,258 of them are classified as dwarf galaxies, and by employing two AGN selection methods based on emission line fluxes (BPT and WHAN), 4,476 are found to have AGN characteristics in their optical spectra. Regardless of selection method, this study finds no discernible differences in environment between AGN and non-AGN host dwarf galaxies and these results indicate that environment is not an important factor in triggering AGN activity in dwarf galaxies. This is in line with existing literature on environments of regular galaxies with AGNs and suggests universality in terms of reaction to environment across the mass regime. The biases of AGN selection in low-mass galaxies, and the biases of different measures of environment are also considered. It is found that there are several mass-trends in emission line ratios and that the SDSS fiber covers galaxies non-uniformly with redshift. These biases should be accounted for in future work by possibly including other wavelength regimes or mass-weighting of emission line ratios. Lastly, a discussion of the environment estimation methods is included since they may not gauge the desired properties due to factors such as time delay or using loosely constrained proxy parameters.

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